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Diagnostic Error Codes
Code
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 coil (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 five (5) times an hour
23
Room freeze protection
24
Discharge air temperature above 185F
26
Ambient temperature beyond operating limits
27
Minimum configuration 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
46
Indoor Coil above 175F
47
Compressor I2T fault
49
Outdoor fan I2T fault
51
Incorrect MCS firmware
52
PFC over voltage
53
AC line under voltage
54
AC line over voltage
33
Description
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