Request code 103 104 105 154 156 157 162 163 164 165 175 176 177 190 191 340 342 343 504 505 506 507 508 509 510 511 512 513 514 515 516 Request content Error history 1 (latest) Error history 2 (second to last) Error history 3 (third to last) Water circulation pump 1 - Accumulated operating time (after reset) Water circulation pump 2 - Accumulated operating time (after reset) Water circulation pump 3 - Accumulated operating time (after reset) Indoor unit - Dip SW1 setting information Indoor uIndoor unit switch setting display (Request code: 162 to 165) 0: OFF 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1: ON 2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0: OFF SW1, SW2, SW3, SW4 3 4 5 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 0 0 0 1
Indoor unit switch setting display (Request code: 162 to 165) 0: OFF 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1: ON 2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0: OFF SW1, SW2, SW3, SW4 3 4 5 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 0 0 0 1
Output signal display (Request code: 175/553) Please refer to Table 2 on relevant wiring diagram whilst using the following.
Output signal display (Request code: 175/553) Please refer to Table 2 on relevant wiring diagram whilst using the following.
Output signal display (Request code: 175/553) Please refer to Table 2 on relevant wiring diagram whilst using the following.
Input signal display (Request code: 176/554) Please refer to Table 1 on relevant wiring diagram whilst using the following.
In Emergency operation mode the outdoor heat pump unit will not operate. Heating for DHW and space heating is provided by the booster heater and the tank immersion heater (if installed). Space heating flow temp is restricted 40°C if an immersion heater is not present on the DHW tank then the booster heater will also indirectly heat the DHW. When in Emergency operation the main control has NO control functions.
10 TROUBLESHOOTING 10-1. Troubleshooting Present and past Error codes are logged and displayed on the main controller or control board of the outdoor unit. Please refer to the table below and subsequent explanations to diagnose and remedy typical problems that may occur in the field. Unit Condition Reoccurring problem Error Code Displayed Not Displayed Non reoccurring problem Action Use table 10-4.
10-4. Self diagnosis and action Check if Dip SW is set correctly. (Refer to Chapter 6-11.) Error code L3 Title and display conditions Circulation water temperature overheat protection Error code displayed when THW1 detects a temp. ≥ 80ºC for 10 consecutive seconds or THW2 detects a temp. ≥ 80ºC for 10 consecutive seconds.
Error code Title and display conditions P1/P2/L5/LD Indoor unit temperature thermistor failure * The thermistors subject to failure can be checked in “Request code: 567” in “Running information Error code displayed when thermistor is at open or short (see table). Exceptions Error code will not be displayed for TH2; During defrost and for 10 mins after defrost operation. Possible Cause Connector/terminal wire has become detached or loose wiring. 1.
Error code Title and display conditions L8 Heating operation error * “3” is displayed in “Request code: 567” in “Running information”. If a), b) and c) occur, L8 is displayed; a) No change on THW1 and THW5 (under 1 °C for 20 minutes from unit starts operation) b) No change on THW1 (under 1 °C for 10 minutes from booster heater starts operation) c) THW1 - THW2 < -5 °C (for 10 minutes continuously) 1. THW1 has become detached from its holder. 1.
Error code Title and display conditions L9 Low primary circuit (Zone2 side) flow rate detected by flow switch * “3” is displayed in “Request code: 569” in “Running information”. Possible Cause Diagnosis and action 1. Insufficient system head 1. If more head required either add an pump of the same size or replace existing pump. Check circulation pump (See 10-6. for how to check). Open purge valve to remove trapped air. Check the strainer for blockages. Check the primary water circuit for leaks.
Error code P6 Title and display conditions Possible Cause THW2 detects a temperature ≤15ºC and TH2 1. Reduced water flow detects a temperature ≤−16ºC for consecutive 10 • Clogged filter seconds. • Leakage of water Diagnosis and action 1., 2. Check water piping. 2. Low temperature • Low load • Inlet water is cold E0/E4 Main controller communication failure (Reception error) Error code E0 is displayed if main controller does not receive any signal from the indoor unit for ref.
Error code Title and display conditions Possible Cause E1/E2 Main controller control board failure Error code E1 displayed if main controller can not access it's non volatile (non power dependent) memory. Error code E2 is displayed when there is a fault with the main controller's internal clock. Indoor unit/wireless receiver communication failure Error code J0 is displayed when the FTC4 can not receive data from the wireless receiver for 1 min. 1. Fault with the main controller circuit board 1.
10-5. Troubleshooting by inferior phenomena No. Fault symptom 1 Main controller display is blank. Possible cause 1. There is no power supply to main controller. 2. Power is supplied to main controller, however, the display on the main controller does not appear. Explanation - Solution 1. Check LED2 on FTC4. (See .) (i) When LED2 is lit. Check for damage or contact failure of the main controller wiring. (ii) When LED2 is blinking. Refer to No. 5 below.
No. 4 Fault symptom Possible cause Explanation - Solution LED2 on FTC4 is off. (See Figure <5.2.1 in 1. FTC4 is not supplied with 220 to 240V AC. installation manual>) 2. There are problems in the method of connecting the connectors. 1. Check the voltage across the L and N terminals on the indoor power supply terminal block. (See section 4.5. in installation manual) • When the voltage is not 220 to 240V AC, check for faulty wiring to power supply.
No. Fault symptom 9 Water heating takes longer. Possible cause 1. Heat pump not working. 2. Booster heater cut-out tripped. 3. Booster heater breaker (ECB1) tripped. 4. The booster heater thermal cut-out has tripped and cannot be reset using the manual reset button. 5. Immersion heater cut-out has been triggered. 6. Immersion heater breaker (ECB2) tripped. 10 Temperature of DHW tank water dropped.
No. Fault symptom 14 In 2-zone temperature control, only Zone2 does not reach the set temperature. 15 16 17 18 19 20 When a PUHZFRP outdoor unit is connected, DHW or Heating operation cannot run. When a PUHZ-FRP outdoor unit is connected and is in heat recovery operation, the set temperature is not reached. After DHW operation room temperature rises slightly. The room temperature rises during DHW operation. Water discharges from pressure relief valve.
No. Possible cause Explanation - Solution 27 The hydrobox that was running in the heating mode before power failure is running in the DHW mode after power recovery. Fault symptom The hydrobox is designed to run in an operation mode with a higher priority (i.e. DHW mode in this case) at power recovery. • Normal operation. • After the DHW max. operation time has elapsed or the DHW max. temperature has been reached, the DHW mode switches to the other mode (ex. Heating mode).
10-6. Checking Component Parts' Function Part Name Check Points EHSC, ERSC series Signal cable 3 M 1~ BLUE BLACK BROWN 3 Power cable BLUE 80.0 PWM input signal External static pressure [kPa] BROWN Signal ref. Feedback signal L N GREEN/ YELLOW Speed 5 (Default) 70.0 Speed 4 Speed 3 60.0 Speed 2 50.0 Speed 1 40.0 30.0 20.0 10.0 0.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.
Part Name Check Points Earth leakage circuit breaker for heater If a short circuit occurs on the booster heater, immersion heater, or each power line, a short-circuit breaker will trip and power source will be blocked. Eliminate the causes of short circuit and then turn on the breaker again. Relay for heater When the applied voltage is not 230V AC across the terminals A1-A2, check the terminals R-U, S-V, and T-W are open.
Part Name Check Points Flow switch Measure the resistance between the terminals with a tester. 1 State of moving part 2 Flow Normal Abnormal Paddle vertical (Flow < 5.5 l/min) Open Other than open Paddle inclined (Flow > 5.5 l/min) Short Other than short 3 Thermistors Disconnect the connector then measure the resistance with a tester. (At ambient temperatures of 10 - 30°C.) Thermistor TH1 TH2 THW1 THW2 THW5 THW6 THW7 THW8 THW9 THWB1 THWB2 OCH532A 65 Normal Abnormal 4.3 - 9.
50 • Room temperature thermistor (TH1) • Liquid refrigerant temperature thermistor (TH2) • Flow water temperature thermistor (THW1) • Return water temperature thermistor (THW2) • DHW tank temperature thermistor (THW5) • Zone 1 flow water temperature thermistor (THW6) • Zone 1 return water temperature thermistor (THW7) • Zone 2 flow water temperature thermistor (THW8) • Zone 2 return water temperature thermistor (THW9) Resistance (k ) 40 Thermistor R0 = 15kΩ ± 3% B con
10-7. Test point diagram F2 6.3A/250V FTC4 (Controller board) F1 6.3A/250V OUT10 (TBO.1 1-2) Signal output (Boiler) (non-voltage contact) CNP1/OUT1 (TBO.1 3-4) Water circulation pump1 (230V AC) CN01 Power supply (230V AC) OUT3 (TBO.1 7-8) Water circulation pump3 (Field supply) (230V AC) CNV1/OUT4 (TBO.1 9-11) 3-way valve/2-way valve1 (9-10: 230V AC) OUT5 (TBO.1 12-14) Mixing valve (Field supply) (12-13[Open]: 230VAC) (13-14[Close]: 230VAC) OUT8 (TBO.
11 DISASSEMBLY PROCEDURE ● Prepare the proper tools. ● Prepare the proper protectors. ● Provide adequate ventilation. ● After stopping the operation of the cylinder and outdoor unit, turn off the power-supply breaker and remove the power plug. ● Discharge the condenser before the work involving the electric parts. ● Allow parts to cool. ● Do not expose the electric parts to water. ● When replacing or servicing water circuit parts, drain system first.
PHOTOS DISASSEMBLY PROCEDURE 3. How to remove the electrical parts Photo 3-1 Control box cover fixing screws (Steps (1) through (3) are applied to all the following parts.) (1) Remove the front panel. (Refer to Procedure 1). (2) Remove the 4 screws holding the control box cover. (Photo 3-1) (3) Slightly lift and pull out the control box cover.
PHOTOS DISASSEMBLY PROCEDURE 4. How to swing the control box to the front (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the control box cover. (Refer to Procedure 3.) *If the screw of the control box bracket (R) and 2 screws of the control box bracket (L) are removed, the control box can be swung to the front without removing control box cover. (3) Remove the screw from the control box bracket (R) and 2 screws from the control box bracket (L). (4) Remove the coated clamps.
PHOTOS DISASSEMBLY PROCEDURE 5. How to remove water pump/ pump valve Close the 2 pump valves (OFF) before removing the water pump, and open the valves (ON) after reinstalling the water pump. (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the control box cover. (Refer to Procedure 3.) (3) Disconnect the CNP1 connector, the earth cable, and the CNPWM connector in the control box.
DISASSEMBLY PROCEDURE PHOTOS 6. How to remove the flow switch (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the control box cover. (Refer to Procedure 3.) (3) Disconnect the CN2F connector on the controller board. (Photo 6-1) (4) Release the flow switch lead wire from the 2 cable clamps, the cable strap, the 2 coated clamps and feed the lead wire out the control box without putting strain on the CN2F connector. (Photo 6-1) (5) Swing the control box to the front. (Refer to Procedure 4.
DISASSEMBLY PROCEDURE PHOTOS 7. How to remove the booster heater (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the control box cover. (Refer to Procedure 3.) (3) Disconnect the booster heater lead wires from the CNBHT connector on the controller board and from the BHC1 (Lead wire No.1 and No.2) and BHC2 (Lead wire No.3 and No.4) contactors respectively. (Photo 7-1) (4) Swing the control box to the front. (Refer to Procedure 4.
DISASSEMBLY PROCEDURE PHOTOS 8. How to remove the plate heat exchanger (1) Pump down the refrigerant circuit and close the stop valve on the indoor unit. (Refer to "12. Supplementary information".) (2) Remove the front panel. (Refer to Procedure 1.) (3) Remove the control box cover. (Refer to Procedure 3.) (4) Disconnect the CNP1 connector on the controller board and the earth cable in the control box.
DISASSEMBLY PROCEDURE PHOTOS 8. How to remove the plate heat exchanger (continued) (11) Remove the pump support under by removing the 4 screws. (Photo 8-4,5) Note: To avoid dropping of the pump support under, hold it by hand when removing the last screw. (12) Remove the G1" nut on the flexible hose end that connects to the booster heater. (Photo 8-2) * When reinstalling the G1" nut, use a new G1" gasket.
DISASSEMBLY PROCEDURE PHOTOS 9. How to remove the strainer (1) Remove the front panel. (Refer to Procedure 1.) (2) Cut the band. (3) Close the strainer valve (OFF). * When either of the pump valve handles is stiff, remove the handle and turn the vertical stem 90 degrees clockwise mainly by using a spanner. (Photo 5-4) (4) Remove the two G1" nuts using two spanners: one to hold the strainer and the other to turn the individual G1" nuts.
DISASSEMBLY PROCEDURE PHOTOS 10. How to remove the manometer / pressure relief valve / air vent (automatic) (Continued) Photo 10-4 Flare joint Pressure relief valve Threads for application of loctite (1) Remove the air vent with a flare joint using two spanners: one to hold the flare joint and the other to turn the flare nut. (2) Remove the flare joint from the air vent.
DISASSEMBLY PROCEDURE PHOTOS 12. How to remove the drain cock (primary circuit) (1) Remove the front panel. (Refer to Procedure 1.) (2) Swing the control box to the front. (Refer to Procedure 4.) (3) Remove the drain cock (primary circuit). Photo 12-1 Booster heater 13. How to remove the flexible hose (1) Remove the front panel. (Refer to Procedure 1.) (2) Swing the control box to the front. (Refer to Procedure 4.) (3) Cut the band.
PHOTOS DISASSEMBLY PROCEDURE 14. How to remove the thermistor (TH2) / thermistor (THW1, THW2) (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the control box cover. (Refer to Procedure 3.) (3) Disconnect the following connectors on the control board. ▪ TH2 (TH2) ▪ THW1, THW2 (THW12) (4) Release the THW12 and TH2 lead wires from the cable clamp, the cable strap and the 2 coated clamps.
DISASSEMBLY PROCEDURE 15. How to remove the drain pan (ERSC-VM2B only) (1) Remove the front panel. (2) Disconnect all the field piping. (3) Cut the band holding the strainer. (Photo 15-2) (4) Remove 3 screws on the cover plate. (Photo 15-3) (5) Remove the cover plate. (Photo 15-4) (6) Remove 3 screws each on the side panel (L, R), and 2 screws on the underneath surface and base assy from the hydrobox. (Photo 15-5) (7) Remove 5 screws on the base assy. (Photo 15-6) (8) Remove the drain pan from the base.
Notes on replacing the parts Replacement of the parts listed below requires the following procedure. After the parts are removed, eliminate loctite on threads by applying loctite remover, apply new loctite, and then install and tighten the parts to the specified tightening torques below. For details about recommended loctite and loctite remover, refer to Table 11-1, and for details about the replacement parts and their tightening torques, refer to Table 11-2. Table 11-1 Recommended Manufacturer No.
12 SUPPLEMENTARY INFORMATION 12-1. Refrigerant collecting (pumpdown) for split model systems only Refer to “Refrigerant collection” in the outdoor unit installation manual or service manual. 12-2. Back-up operation of boiler Heating operation is backed up by boiler. For more details, refer to the installation manual of PAC-TH011HT-E. 1. Set Dip-SW 1-1 to ON "With boiler" and SW2-6 to ON “With Mixing tank”. 2. Install the thermistors THWB1 (Flow temp.
13 SERVICE AND MAINTENANCE The main controller settings changed from the default settings are reset by replacing the controller board. To facilitate reselecting settings on the main controller, it is recommended to write down the changes in the sheet below before replacement. 13-1. Engineers Forms (1/2) Should settings be changed from default, please enter and record new setting in ‘Field Setting’ column.
Engineers Forms (2/2) Commissioning/Field settings record sheet (continued from the previous page) Main controller screen Setting Service menu Thermistor adjustment THW1 THW2 THW5 THW6 THW7 THW8 THW9 THWB1 THWB2 Auxiliary Economy settings settings for pump Electric heater (Heating) Electric heater (DHW) *3 Mixing valve control Pump speed Heat source setting Operation Freeze stat function settings Simultaneous operation (DHW/ Heating) Parameters Default setting −10°C - +10°C −10°C - +10°C −10°C - +10°C
13-2. Annual Maintenance Log Book Contractor name Site name Engineer name Site number Hydrobox maintenance record sheet Warranty number No. Mechanical Isolate and drain hydrobox, remove mesh from internal strainer clean and replace. Open the pressure relief valve, check for unrestricted discharge to 2 the tundish and that the valve reseats correctly. Check there are no blockages in the tundish and associated pipe work.
HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Jan. 2013 No. OCH532 REVISED EDITION-A Distributed in Sep. 2012 No. OCH532 Made in Japan New publication, effective Jan. 2013 Specifications are subject to change without notice.
