Troubleshooting By Error Code - Carrier 42QFD048D8S Service Manual

Part requiring
replacement
Indoor PCB
Outdoor PCB
Outdoor fan motor
T3 Sensor
T4 Sensor
TP Sensor
TH Sensor
Compressor
IPM module board
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.

7. Troubleshooting by Error Code

EC 50/ec
EC 53
05
x x
x x
x
x
x x
x x
x x
 Troubleshooting 18
Error Code
EC 52 EC 54
x x
x x
x
x x
x
x x
x x
x x

EC 55 EC 51
x x
x x
x x
x x
x x
x
x x
x x
EC 07 PC 00
x x
x x
x x
x x
x x
x
x