Service Handbook COMMERCIAL ELECTRIC WATER HEATERS MODELS STCE3-52/80/119 & ITCE3-52/80/119 INSTALLATION CONSIDERATIONS - PRE SERVICE CHECKS - WATER HEATER CONSTRUCTION OPERATION & SERVICE - TROUBLESHOOTING Technical Support and Parts: 800-456-9805 www.americanwaterheater.com Servicing should only be performed by a Qualified Service Agent. PRINTED IN THE U.S.
COMMERCIAL ELECTRIC WATER HEATER SERVICE MANUAL TABLE OF CONTENTS INTRODUCTION ....................................................................... 2 Qualifications ...................................................................... 2 Service Warning ................................................................. 2 Tools Required.................................................................... 3 INSTALLATION CONSIDERATIONS ........................................ 4 Closed Water Systems .........
INTRODUCTION INTRODUCTION This Service Manual is designed to be an aid in servicing and troubleshooting the commercial electric water heater models listed on the cover.The instructions, illustrations and procedures contained in this manual are used to verify proper operation and to diagnose and repair common service problems. This Service Manual does not replace or supersede the Instruction Manual that came with the water heater.
INTRODUCTION INSTRUCTION MANUAL Have a copy of the Instruction Manual that came with the water heater on hand for the correct model water heater you are working with before servicing. Installation information given in this Service Manual IS NOT a complete installation instruction. Installation information covered in this Service Manual has a limited focus as it applies to servicing. This Service Manual does not replace or supersede the Instruction Manual that came with the water heater.
INSTALLATION CONSIDERATIONS INSTALLATION CONSIDERATIONS Installation information given in this Service Manual IS NOT a complete installation instruction. Installation information covered in this Service Manual has a limited focus as it applies to servicing. This Service Manual does not replace or supersede the Instruction Manual that came with the water heater. Always refer to the Instruction Manual that came with the water heater for complete installation instructions.
INSTALLATION CONSIDERATIONS ELECTRICAL REQUIREMENTS Grounding Review the electrical ground requirements given in the Instruction Manual that came with the water heater and ensure the water heater has been properly grounded. The water heater must be grounded in accordance with the National Electric Code and/or local codes. These codes must be followed in all cases.
PRE SERVICE CHECKS PRE SERVICE CHECKS WIRING CONNECTIONS With the power supply to the water heater turned off ensure the wiring connections are properly tightened to all components including: high voltage terminal blocks, fuse blocks, contactors, transformers and heating elements. Loose connections at any connection point will cause increased amperage and excessive heat which can damage wiring and components.
WATER HEATER CONSTRUCTION WATER HEATER CONSTRUCTION There are two types of commercial electric water heaters covered in this manual. See Figure 1 on page 8 and Figure 2 on page 9. SURFACE MOUNT CONTROL MODELS The first type of water heater covered in this manual is equipped with surface mount thermostat/ECO controls - Surface Mount Control Models.
WATER HEATER CONSTRUCTION SURFACE MOUNT CONTROL MODELS Figure 1 Servicing should only be performed by a Qualified Service Agent 8
WATER HEATER CONSTRUCTION ELECTRONIC CONTROL MODELS Figure 2 Servicing should only be performed by a Qualified Service Agent 9
OPERATION & SERVICE OPERATION & SERVICE This section of the manual will cover the principles of electricity, single and three phase power, fuses, surface mount thermostat/ECO combination controls, heating element construction & operation, heating element sensors, contactors, common service procedures and more. Information and service procedures presented in this section will be referenced in the troubleshooting sections.
OPERATION & SERVICE Ohms Law A law that explains the relationship between voltage, current and resistance. The law states that the electric current flowing through a conductor is equal to the voltage divided by the resistance. The following equations further explain ohms law.
OPERATION & SERVICE SINGLE AND THREE PHASE POWER The water heaters covered in this manual can be field converted for a single or three phase power supply - see pages 15 and 16. These water heaters can be factory ordered for standard North American power supplies; 277/208/240/480 volt models. 277 volt models are single phase only. Voltage conversion kits with instructions are available from the manufacturer - voltage conversions are not covered in this manual.
OPERATION & SERVICE Checking Single Phase (1Ø) Power A single phase power supply consists of two wires connected to the L1 and L2 terminals of the Power Distribution Block, the L3 terminal is not used. On a single phase (1Ø) 277 volt power supply one of the two wires is a “neutral” wire and does have voltage present. On a single phase (1Ø) 277 volt power supply the “hot” wire should be connected to the L1 terminal and the “neutral” wire should be connected to the L2 terminal.
OPERATION & SERVICE Checking Three Phase (3Ø) Power A three phase power supply consists of three wires connected to the L1, L2 and L3 terminals of the Power Distribution Block. All three wires are “hot” with voltage present. Voltage Between Terminals: Set the volt meter to an AC voltage range above the expected voltage (600 VAC or higher range initially).
OPERATION & SERVICE PHASE CONVERSIONS - SURFACE MOUNT CONTROL MODELS Internal wiring connections between the Power Distribution Block and the heating elements are different on Surface Mount Control (see Figure 1 page 8) and Electronic Control (see Figure 2 page 9) model water heaters. Because of these differences there are two methods for field converting these models to work with single and three phase power supplies.
OPERATION & SERVICE PHASE CONVERSIONS - ELECTRONIC CONTROL MODELS Internal wiring connections between the Power Distribution Block and the heating elements is different on Surface Mount Control (see Figure 1 page 8) and Electronic Control (see Figure 2 page 9) model water heaters. Because of these differences there are two methods for field converting these models to work with single and three phase power supplies.
OPERATION & SERVICE FUSES The water heaters covered in this manual have power circuit fuses to protect the heating element circuits. Electronic Control models will have two additional fuses to protect the primary winding of the 120 Volt Control Circuit Transformer. See Figures 1 and 2 on pages 8 and 9 for location. Testing fuses requires an ohm meter, an AC volt meter and an insulated fuse puller - see Tools Required page 3.
OPERATION & SERVICE SURFACE MOUNT THERMOSTATS The Surface Mount Control Model water heaters covered in this manual have “separate” thermostat/ECO (energy cut out) combination controls mounted to the surface of the storage tank directly above the heating elements they control. IE: a water heater equipped with 9 heating elements will have 9 thermostat/ECO controls. These controls contain two bimetal thermal switches that react to heat sensed from the surface of the water heater’s storage tank.
OPERATION & SERVICE Thermostat & ECO Test 1 Secure power to the water heater at the main breaker or disconnect switch. 2 Ensure tank temperature is less than 100°F/38°C - dump water to lower tank temperature if necessary. 3 Press the red reset button firmly on all thermostat/ECO controls. 4 Raise the temperature setting on all thermostat/ECO controls to 140°F or higher. 5 Restore power to the water heater.
OPERATION & SERVICE HEATING ELEMENTS This section of the manual provides information on how to determine the actual voltage and wattage rating of a heating element along with tables showing heating element configurations, heating element amperage and heating element resistance/ohms. This section also contains heating element test procedures to measure; amperage, voltage, resistance and check for grounded elements. These procedures are used to determine if a heating element is defective or working properly.
OPERATION & SERVICE Heating Element Ratings Heating elements are labeled with their voltage and KW rating - see image below. The element shown here is a 6000 watt (6 KW) 240 volt element. Wattage and Voltage Ratings Note: some heating elements are dual rated elements IE: 208/240 volts Heating Element Configurations The table below shows how many heating elements are installed at the factory and the wattage of each heating element according to the rated voltage of the water heater.
OPERATION & SERVICE Heating Element Amperage This table shows the approximate amp draw for the various heating elements used. First determine the actual rated wattage and voltage of the element being tested - see Heating Element Ratings on page 21. Then follow the Heating Element Amperage Test procedure on page 23 to measure amperage at each heating element. Compare the measured value to the values in the table below.
OPERATION & SERVICE Heating Element Amperage Test This test should be considered as a first diagnostic procedure for the common service complaints of no hot water or not enough hot water. The heating element amperage test shown on this page is the best procedure to quickly determine which (if any) heating elements are not working properly. 1 Secure power to the water heater at the main breaker or disconnect switch.
OPERATION & SERVICE Heating Element Voltage Test This test is typically performed after an amperage test (see page 23) has determined one or more heating elements is not drawing correct amperage. 1 Secure power to the water heater at the main breaker or disconnect switch. 2 Ensure tank temperature is less than 100°F/38°C - dump water to lower tank temperature if necessary. 3 Surface Mount Control Models - raise the temperature settings to ensure a call heat is active for all heating elements.
OPERATION & SERVICE Heating Element Resistance & Ground Tests This is a two part test. In the first part of this test the actual resistance (ohms) of each heating element is measured. In the second part of this test each heating element is tested for any continuity to ground to ensure the heating element is not shorted to ground.
OPERATION & SERVICE Heating Element Ground Test 1 Secure power to the water heater at the main breaker or disconnect switch. 2 Verify with an AC volt meter that there is not any voltage present at the Power Distribution Block (see Figures 1 and 2 on pages 8 and 9) and at the two wiring terminals on the ends of all heating elements. 3 Disconnect both power wires from the terminals on the top of all heating elements to be tested.
OPERATION & SERVICE ELEMENT SENSORS Electronic Control Models covered in this manual monitor all heating elements using Element Sensors. Each Element Sensor monitors 3 heating elements. There will be one Element Sensor for each Bank of heating elements. See Figure 2 on page 9 and the illustration on page 30.
OPERATION & SERVICE Element Sensor Operation When current (amperage) flows through a wire in an electrical circuit a magnetic field is developed that radiates out from the wire. The individual current sensors detect this magnetic field. When current flows in a wire routed through the hole in one of the individual current sensors, the sensor is activated and sends a signal back to the CCB confirming the presence of current. The current sensors require approximately 3 AC amps minimum to activate.
OPERATION & SERVICE CONTACTORS This section of the manual provides information on how contactors used on Electronic Control Models are constructed, how they work and how to test contactor operation - see Figure 2 on page 9 for location of the contactors on these models. Surface Mount Control Models are not equipped with contactors. Contactor Construction - How They Work Magnetic contactors are used on Electronic Control Models to energize and de-energize the heating elements.
OPERATION & SERVICE Contactor Configurations This illustration shows how contactors are configured and how they provide power to the heating elements on Electronic Control Model water heaters, This is a redundant contactor configuration - two contactors must close their contacts to energize any heating element. Elements and Banks are numbered according to how the control system monitors them see Element Sensors pages 27 and 28. There are two contactors installed for each Bank.
OPERATION & SERVICE Contactor Inspection A thorough visual inspection of the contactors used on Electronic Control Models should be performed as part of any regular maintenance program and whenever the water heater is being serviced. Refer to the listed Steps and images below for this procedure. 1 Secure power to the water heater at the main breaker or disconnect switch.
OPERATION & SERVICE Contactor Coil Voltage - At Contactor This test procedure will measure contactor coil voltage at the contactor. 1 Ensure tank temperature is less than 100°F/38°C - dump water to lower tank temperature if necessary. 2 Adjust the temperature settings to ensure a call heat is active for all heating elements. Raise the Operating Set Point in the Temperatures Menu to 140°F or higher. Set all Heating Element Bank Differentials in the Temperatures Menu to 2°F - see pages 52 and 53.
OPERATION & SERVICE Contactor Coil Voltage - At CCB This test procedure will measure contactor coil voltage where it originates at the J4 wiring terminals on the CCB. See page 42 for the CCB’s J4 wiring terminal location. 1 Ensure tank temperature is less than 100°F/38°C - dump water to lower tank temperature if necessary. 2 Adjust the temperature settings to ensure a call heat is active for all heating elements. Raise the Operating Set Point in the Temperatures Menu to 140°F or higher.
OPERATION & SERVICE TRANSFORMERS This section of the manual provides information on how to test and ensure the multiple tap 120 VAC Control Circuit Transformer is wired properly on Electronic Control Models. This section will also provide test procedures for the 24 VAC transformer used by the electronic control system - see Figure 2 on page 9 for location of the transformers on these models. Surface Mount Control Models are not equipped with transformers.
OPERATION & SERVICE 120 VAC Control Circuit Transformer Test 1 Ensure the main breaker or disconnect switch is turned on. 2 Verify with an AC volt meter that proper voltage is present at the Power Distribution Block (see Figure 2 on page 9 and pages 12 - 14). 3 Check Primary Winding Voltage: Using an AC volt meter; set the volt meter to an AC voltage range above the expected voltage (600 VAC or higher range initially).
OPERATION & SERVICE 24 VAC Transformer Test 1 Ensure the main breaker or disconnect switch is turned on. 2 Verify with an AC volt meter that proper voltage is present at the Power Distribution Block (see Figure 2 on page 9 and pages 12-14). 3 Check Primary Winding Voltage: Using an AC volt meter; set the volt meter to an AC voltage range just above 120 VAC.
OPERATION & SERVICE IMMERSION TEMPERATURE PROBE This section of the manual provides information on how test the Immersion Temperature Probe on Electronic Control Models - see Figure 2 on page 9 for location. The Immersion Temperature Probe contains the ECO (energy cut out) and a Temperature Sensor. The Immersion Temperature Probe plugs into the CCB circuit board at the J5 socket. See the CCB circuit board layout and identification illustration and tables on pages 42 - 44.
OPERATION & SERVICE Temperature Sensor Resistance Test 1 Secure power to the water heater at the main breaker or disconnect switch. 2 Unplug the J5 plug from the CCB circuit board - see page 42 for location. 3 Using an ohm meter: set the ohm meter range to a scale above 30,000 ohms initially. 4 Touch the ohm meter probes between the two middle pins (black wires) of the J5 plug end as shown in the image below.
OPERATION & SERVICE Temperature Sensor DC Voltage Test 1 Ensure the main breaker or disconnect switch is turned on. 2 Verify the CCB circuit board has the correct input voltage at the J2 socket and is properly grounded perform the “Checking Power and Ground To The CCB” tests on page 46.
OPERATION & SERVICE ECO Voltage Test 1 Ensure the main breaker or disconnect switch is turned on. 2 Verify the CCB has the correct input voltage at the J2 socket and is properly grounded - perform the Checking Power and Ground To The CCB tests on page 46. 3 Using an AC volt meter; set the volt meter to an AC voltage range just above 120 VAC.
ELECTRONIC CONTROLS ELECTRONIC CONTROLS This section covers the electronic control system used on Electronic Control Models - see Figure 1 on page 9. The control system includes a CCB (Central Control Board) and a UIM (User Interface Module). The CCB constantly monitors safely controls, heating elements, water temperature and other functions of the water heater. Operational information is continuously reported to the user through text and icons on the liquid crystal display (LCD) portion of the UIM.
ELECTRONIC CONTROLS CCB - CENTRAL CONTROL BOARD All wiring connections and sockets will be identified in the following pages. The Troubleshooting section of this manual will refer to this illustration and information.
ELECTRONIC CONTROLS CCB Socket & Wiring Terminal Identification Refer to the illustration on page 42 for physical location of the sockets and wiring terminals. J1 Socket - Transformer PIN # DESCRIPTION 1 2 3 4 5 120 VAC hot to transformer Not used 120 VAC neutral to transformer 24 VAC out from transformer 24 VAC out from transformer J2 Socket - 120 VAC Power Supply PIN # DESCRIPTION 1 2 3 120 VAC hot Earth Ground 120 VAC neutral J3 Wiring Terminals - Alarm Output Relay (see page 59) TERMINAL N. O.
ELECTRONIC CONTROLS J7 Socket - Enable / Disable Circuits 1 & 2 (see pages 45 & 54) DESCRIPTION PIN # 1 2 3 4 Enable/Disable circuit 1 Enable/Disable circuit 1 Enable/Disable circuit 2 Enable/Disable circuit 2 J8 Socket - Not Used J9 Socket - Not Used J10 Socket - Not Used J11 Port - Communication Port - UIM Display (user interface module) J12 Socket - Heating Element Sensors Bank 1 J13 Socket - Heating Element Sensors Bank 2 J14 Socket - Heating Element Sensors Bank 3 J15 Socket - Not Used J16 Socket -
ELECTRONIC CONTROLS CCB Enable/Disable Circuit(s) Test The electronic control system includes two enable/disable circuits (see page 54) for use with field installed supervisory controls such as building EMS (Energy Management System). These two circuits are located at the CCB’s four pin J7 Socket. Both of these Enable/Disable circuits must be closed to enable heating operation.
ELECTRONIC CONTROLS Checking Power and Ground To The CCB The CCB circuit board is powered by the120 VAC Control Circuit Transformer (see pages 34-35) at the J2 Socket, pins 1 & 3 (see page 42). This procedure is performed to ensure the 120 VAC power is being supplied to the CCB. 1 Ensure the main breaker or disconnect switch is turned on. 2 Verify with an AC volt meter that proper voltage is present at the Power Distribution Block (see Figure 2 on page 9 and pages 12-14).
ELECTRONIC CONTROLS UIM - USER INTERFACE MODULE UIM Components The UIM’s major components include a Circuit Board with LCD display and a Button Pad Overlay which contains the five user input buttons. Service Notes - Button Pad Ribbon Cable The Ribbon Cable that connects the Button Pad Overlay to the UIM Circuit Board must be plugged in exactly as shown in the images below; with the metal crimp connections visible on the plug end and the UIM Circuit Board back facing out.
ELECTRONIC CONTROL SYSTEM ELECTRONIC CONTROL SYSTEM CONTROL SYSTEM FEATURES Advanced Diagnostics: Plain English text and animated icons display detailed operational and diagnostic information. LCD screen on the front of the water heater displays the Sequence of Operation in real time. Fault or Alert messages are displayed when operational problems occur. Advanced Service menu displays a list of possible causes for current Fault and Alert conditions to aid in servicing.
ELECTRONIC CONTROL SYSTEM THE DESKTOP SCREEN The illustration below shows the control system “Desktop Screen.” This is the default screen. If there are no active Fault or Alert conditions and no user input for approximately 10 minutes the control system will return to this screen automatically. Model Information: Model information and menu titles are shown in the black bar at the top of the Desktop Screen. Tank Temperature: Current water temperature as sensed from the immersion Temperature Probe.
ELECTRONIC CONTROL SYSTEM Table 1 Status Icons ICON DESCRIPTION Water temperature in the tank has fallen. Shaded area of the animated thermometer icon will rise and fall in response to water temperature in the storage tank as sensed from the immersion Temperature Probe. Water temperature in the tank has reached the Operating Set Point. Shaded area of the animated thermometer icon will rise and fall in response to water temperature in the storage tank as sensed from the immersion Temperature Probe.
ELECTRONIC CONTROL SYSTEM Table 2 - Operating States STATE DESCRIPTION Standby The water heater is not in an active heating cycle. This usually indicates the temperature in the tank has reached the Operating Set Point and the control system has terminated the heating cycle. The control system is in the Heating Mode. At least one bank of heating elements has been energized. The control system has detected/declared an Alert Condition. The controls system will continue heating operation.
ELECTRONIC CONTROL SYSTEM TEMPERATURES MENU Operating Set Point User adjustable setting 90°F to 190°F range; factory default is 120°F. When the water temperature sensed by the control system from the immersion Temperature Probe reaches the Operating Set Point the control system will end the heating cycle. A call for heat will be activated again when the water temperature drops below the Operating Set Point minus the 1st Differential Setting.
ELECTRONIC CONTROL SYSTEM Temperature Settings The Operating Set Point and the Differential Settings are adjusted in the Temperatures Menu. The following instructions explain how to adjust these user settings and navigate the control system menus. ACTION DISPLAY From the Desktop Screen, press the Operational Button underneath “MENU” to enter the Main Menu.
ELECTRONIC CONTROL SYSTEM HEATER STATUS MENU This menu displays non adjustable operational information. This menu contains more information that can be displayed on one screen of the LCD display. Use the Up & Down Buttons to navigate to the bottom of this menu. Status Top Of Menu Displays the current Operating State of the control system. IE: Heating, Standby, Fault etc. - see Table 2 on page 51. Element Banks On Displays the current number of heating element Banks the control system has energized.
ELECTRONIC CONTROL SYSTEM ECONOMY MODE SETUP MENU This menu contains settings used to establish an “Economy Set Point” and “Economy Mode” operating periods. This control system feature can help reduce operating costs during unoccupied, low load, or peak demand periods. Setpoint Adjustment Adjustable user setting (2°F to 50°F - factory default is 20°F) the control system uses to calculate the “Economy Set Point.
ELECTRONIC CONTROL SYSTEM Economy Mode Settings Setpoint Adjustment Value ACTION DISPLAY From the Desktop screen, press the Operational Button underneath “MENU” to enter the Main Menu. (see UIM Navigation on page 48) Notice how the text above the Operational Buttons on the display changes as you navigate through the various menus and screens. Use the Up/Down buttons to select (highlight in black) the Economy Mode Setup menu from the Main Menu.
ELECTRONIC CONTROL SYSTEM Economy Mode Settings Time Clock Settings ACTION DISPLAY From the Desktop Screen navigate to the Economy Mode Setup menu - see page 56 for instructions. Use the Up/Down buttons to select (highlight in black) Current Time sub menu. Press the Operational Button underneath “CHANGE” to enter the Current Time sub menu. Use the Up/Down buttons to select the “Weekday” setting. Press the Operational Button underneath “CHANGE” to activate the adjustment mode for this setting.
ELECTRONIC CONTROL SYSTEM Economy Mode Settings Daily Operating Mode Settings ACTION DISPLAY Economy Mode All Day: From the Economy Mode Setup menu use the Up/Down buttons to select (highlight in black) the Daily sub menu for “Sun.” Press the Operational Button underneath “CHANGE” to enter this menu. See “Time Clock” settings on page 57 for instructions on navigating to the Economy Mode Setup menu. Use the Up/Down buttons to select (highlight in black) the “Economy Mode All Day” setting.
ELECTRONIC CONTROL SYSTEM ALARM OUTPUT SETUP MENU Permits user to set the condition (from a list of options) for when the CCB’s integral alarm output relay will be energized. Alarm relay connections (common, normally open, normally closed) are located on the J3 terminal strip on the CCB (see page 42). Alarm output relay contacts are capable of switching 1 amp maximum at 120 VAC.
ELECTRONIC CONTROL SYSTEM DISPLAY SETTINGS MENU Permits user to set display options for viewing information on the UIM’s LCD screen. Temperature Units Adjustable user setting that changes temperature units display to Celsius °C or Fahrenheit °F. Backlight Delay Adjustable user setting that determines how long the UIM’s LCD backlight remains illuminated after a key has been pressed. Available settings are; Always Off, 10, 30 or 60 seconds and Always On.
ELECTRONIC CONTROL SYSTEM HEATER INFORMATION MENU This menu displays non adjustable operational information. Elapsed Time Top Of Menu Total accumulated time the control system (water heater) has been energized. Total Heating Time Total accumulated time the control system has been in the heating mode. IE: any heating elements have been energized. Bank # Cycles Total accumulated count of heating cycles for each Bank of heating elements.
ELECTRONIC CONTROL SYSTEM CURRENT FAULT / ALERT MENU This menu displays non adjustable operational information. With the Fault History sub menu selected in Main Menu; press the Operational Button underneath “SELECT” to display the current Fault or Alert message. If there is not a Fault or Alert condition currently active “(none)” is displayed to the right of this menu. Main Menu - Current Fault Selected FAULT HISTORY MENU This menu displays non adjustable operational information.
RESTORE FACTORY DEFAULTS MENU This control system menu allows the user to restore most of the control system’s user settings to their factory default settings. User settings in the Alarm Output Setup and Display Settings menus are unaffected by executing Restore Factory Defaults. Restore Factory Defaults ACTION DISPLAY From the Main Menu use the Up/Down buttons to select (highlight in black) the “Restore Factory Defaults” menu. Press the Operational Button underneath “SELECT.
TROUBLESHOOTING TROUBLESHOOTING COMMON SERVICE PROBLEMS No Hot Water 1 Hot water supply valve turned off. 2 Check power to the water heater - see pages 12 - 14. 3 Check thermostat/ECO controls on Surface Mount Control Models - see pages 18 & 19. 4 Check Operating Set Point and Differential Set Points on Electronic Control Models - see pages 52 & 53. 5 Check all fuses - see page 17. 6 Check heating elements pages 20 - 26.
TROUBLESHOOTING ELECTRONIC CONTROL MODELS The remainder of the Troubleshooting section covers Electronic Control Models only. Fault Conditions When the control system declares a Fault condition it will display a Fault message on the UIM and lock out. Voltage to the contactor coils and heating elements is terminated to prevent further heating operation.
TROUBLESHOOTING Control System Unresponsive (cont) DISPLAYED MESSAGE CONDITION/INDICATES UIM is Inoperable UIM does not respond to any user input using the operational and/or Up and Down buttons. Heating Cycle Disabled Control System not activating call for heat with cold tank of water. Thermometer Icon on Desktop Screen appears with diagonal line as shown here.
TROUBLESHOOTING FAULT AND ALERT MESSAGES Troubleshooting procedures for the most common Fault and Alert messages are covered in this section. In the tables that follow the first column shows the Fault or Alert message as displayed by the UIM along with an explanation. The second column details things to check or repair and references test procedures detailed in the Operation and Service section (pages 10 - 47) of this manual.
TROUBLESHOOTING Fault & Alert Messages DISPLAYED MESSAGE CONDITION/INDICATES “Temp Probe Open” CHECK/REPAIR • Check the J5 plug/socket connections at the CCB ensure they are mating properly and providing good contact. Check the pins inside the J5 plug/socket for wear or damage. See CCB illustration and socket identification on pages 42 - 44. Replace damaged plug connectors/wiring harness as necessary.
TROUBLESHOOTING Fault & Alert Messages DISPLAYED MESSAGE CONDITION/INDICATES “Energy Cut Out (ECO)” CHECK/REPAIR • Check the J5 plug/socket connections at the CCB ensure they are mating properly and providing good contact. Check the pins inside the J5 plug/socket for wear or damage. See CCB illustration and socket identification on pages 42 - 44. Replace damaged plug connectors/wiring harness as necessary.
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