Manual

21
MP Series
Chart 3.2 • Diagnostic LEDs
LED Color Description Operation
2
Green Power On if power to unit.
3
Green Heat On if call for heat.
4
Green Fan On if fan energized.
5
Green Valve On if valve energized.
6
Red Service Errors (see Chart 3.3).
LED CODE
(Number of Flashes) STATUS / ERROR
1-1 Long Run Time - Actual temperature fails to rise after 4 hours of consecutive running.
1-2 Blower - Fan is on but static pressure is not reading properly.
1-3 Ignition Module Failure - Ignition module failed to initiate sequence of ignition.
1-4 Ignition Soft Lockout - Control will auto reset after 15 minutes. See lockout in diagnostics
section.
2-1 Ignition Hard Lockout - Ignition module will NOT auto reset; unit will not operate unless
there is an interruption by the user.
2-2 Sensor Error - External temperature sensor is shorted or reading open.
2-3 Internal Software Error - Failure with software on modulating controller.
2-4 Model Selection or Setup Error - Invalid model selection DIP Switch configuration
3-2 Error with User Interface - Short was detected in user interface.
Chart 3.3 • Flash Code Status LED (located on Circuit Board)
Each of the following status codes is a two digit number with the first digit determined by the number of
short flashes and the second digit by the number of long flashes.
Figure 3.2 • Circuit Board LEDs
LED2
LED3
LED4
LED5
LED6
LED1
LED2
LED3
LED4
LED5
LED6
LED1
LED2
LED3
LED4
LED5
LED6
LED1
Chart 3.1 • Operation LED
LED Color Description Operation
1
Green Relay ON On if relay ON to ignition module.
LED Short Flash: 0.5 Seconds ON, 0.5 Seconds OFF.
LED Long Flash: 1.5 Seconds ON, 1.5 Seconds OFF.
3.0 Operation • Diagnostics