Quick Reference Guide - Error Codes - Lennox MPA009S4S Service Manual

20. Quick Reference Guide - Error Codes

LED Display (LED 1: Blue)
Slow Flash
On
Fast Flash
Slow flash -- flashing at 1Hz.
Fast flash - flashing at 2Hz.
Main Control IPM Control (comp. driver)
Blue LED Red LED
Slow Flash OFF
ON ON
Fast Flash OFF
Fast Flash ON
Fast Flash Fast Flash
Fast Flash Fast Flash
Fast Flash ON
Fast Flash OFF
Fast Flash Fast Flash
Slow flash - Flashing at 1Hz
Fast flash- Flashing at 2Hz
Display Error Description
E0 Outdoor unit EEPROM error.
E2 Communication error between outdoor unit and all indoor units.
E3 Communication error between outdoor unit main control and IPM control.
E4 Temperature sensor error (outdoor coil, outdoor ambient , compressor discharge and indoor unit coil outlet temperature sensors.
E5 High and low voltage protection.
E8 Outdoor DC fan speed error.
F1 Indoor unit #1 coil outlet temperature sensor error.
F2 Indoor unit #2 coil outlet temperature sensor error.
F3 Indoor unit #3 coil outlet temperature sensor error.
F4 Indoor unit #4 coil outlet temperature sensor error.
F5 Indoor unit #5 coil outlet temperature sensor error.
F6 Indoor unit #6 coil outlet temperature sensor error.
P1 High pressure switch open
P2 Low pressure switch open
P3 Outdoor compressor current overload sensed.
P4 High temperature sensed at compressor discharge line.
P5 High temperature sensed at outdoor coil.
P6 Inverter module (IPM) error.
Table 6. Single-Zone 009/012 115VAC/208-230VAC
Table 7. Single-Zone 018/030 208-230VAC
Error Description
Green LED
ON Stand-by
OFF Normal operation
ON Could be one of the following:
•
•
•
•
ON DC bus voltage is too high or to low protection.
ON Driver EEPROM error.
OFF Driver chip start-up failure.
Fast Flash Could be one of the following:
•
•
•
Fast Flash IGBT over-current or IPM over-current
Fast Flash Control chip communication error.
Table 8. Multi-Zone Outdoor Unit
Error Description
Standby
Normal operation
Outdoor unit error.
Indoor and outdoor unit communication error.
Outdoor unit temperature sensor error.
Outdoor unit EEPROM error
Compressor top temperature switch is open.
Driver phase loss protection
Driver zero speed protection
PWM synchronization failure.
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