77 PB
TROUBLESHOOTING
Diagnostic 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
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 conguration not met
28 Motor board critical failure
29 Bad heater board rmware (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
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