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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 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
16
Compressor model code error
17
Compressor output phase loss
19
Outdoor coil temperature above 175F
20
Indoor coil frozen
24
Discharge air temperature above 185F
26
Ambient temperature beyond operating limits
27
Minimum configuration not met
28
Motor board critical failure
29
Bad heater board firmware (VRP36 only)
30
MCS ID fan port over current
31
MCS OD fan port over current
32
MCS compressor port over current
34
Unit not provisioned
35
DC bus over voltage
36
DC bus under voltage
37
PCB over temperature
39
Low blower speed
40
Wall controller connection issue
41
EEV start-up fault
42
Compressor speed sync error
43
Motor board communication issue
44
Compressor start failure
45
Compressory current limited
46
ID Coil temperature greater than 175F
47
Compressor I2T fault
48
ID fan I2T fault
49
OD fan I2T fault
50
Motor board processor over voltage (15V)
51
DC bus over current
52
DC axis over voltage
53
AC line under voltage
54
AC line over voltage
Description
36
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