Carrier 42QFD048D8S Service Manual page 115

TS33: Communication error between outdoor main chip and compressor driven chip
diagnosis and solution
Description: The main chip cannot detect the compressor driven chip
Recommended parts to prepare:
• Outdoor main PCB
• Electric control box
Troubleshooting and repair:
Shut off the power supply and
Shut off the power supply and
turn it on 2 minutes later.
turn it on 2 minutes later.
Is it still displaying
Is it still displaying
the error code?
the error code?
Replace outdoor main board
Replace outdoor main board
If the system can run
If the system can run
normally?
normally?
NO
Replace the electric control box
Replace the electric control box
 Troubleshooting
NO
Trouble is solved
YES Trouble is solved
