Carrier 42QFD048D8S Service Manual page 112

TS18: Outdoor unit malfunction Diagnosis and Solution
Description: The indoor unit detect the outdoor unit is error.
Recommended parts to prepare:
• Outdoor unit
Troubleshooting and repair:
Power off, then restart the unit 2
Power off, then restart the unit 2
minutes later. Does the outdoor main
Is the main board
minutes later. Does the outdoor main
Is the main board
No
board display an error code a few
displaying an error?
board display an error code a few
displaying an error?
minutes later?
minutes later?
Yes
Yes
Refer to the prescribed
Refer to the prescribed
steps for resolving the
steps for resolving the
issue
issue
 Troubleshooting 