38
Diagnostic Error Codes
Code Description
3 Return air thermistor open/shorted
4 Indoor coil (cool inlet) thermistor open/shorted
5 Outdoor coil (heat inlet) thermistor open/shorted
6 Discharge air thermistor open/shorted
7 Outdoor ambient thermistor open/shorted
8 Indoor coild (heat cond.) thermistor open/shorted
9 Compressor discharge thermistor open/shorted
10 Compressor suction thermistor open/shorted
11 Liquid cool thermistor open/shorted
12 Liquid heat thermistor open/shorted
13 Humidity sensor open/shorted
14 Pressure limit switch open
19 Outdoor coil temperature above 175F
20 Indoor coil frozen
21 Unit cycles more than ve (5) times an hour
23 Room freeze protection
24 Discharge air temperature above 185F
26 Ambient temperature beyond operating limits
27 Minimum conguration not met
31 Outdoor fan over current
32 Compressor over current
34 Unit not provisioned
35 DC bus over voltage
36 DC bus under voltage
39 Low blower speed
40 Wall controller disconnected
41 EEV fault
43 MCS communication failure
47 Compressor I2T fault
46 Indoor Coil above 175F
49 Outdoor fan I2T fault
51 Incorrect MCS rmware
52 PFC over voltage
53 AC line under voltage
54 AC line over voltage
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