Carrier 40MAHBQ06XA Service Manual page 25

SG-40MAHB-01: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Overload current protection diagnosis and solution (F0)
Malfunction Decision Conditions
An abnormal current rise is detected by checking the specified current detection circuit.
Possible Causes:
• Power supply problems
• System blockage
• PCB faulty
• Wiring mistake
• Compressor malfunction
Troubleshooting
Check for system blockage.
Check the connection and the wires.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Check the power supply.
Yes
Yes
Check the compressor
resistance values.
Yes
Yes
Check the reactor
Yes
Replace the outdoor unit.
No
No Clear the blockage.
No Replace the compressor.
Correct the connections or
No
replace the wires.
Replace outdoor main PCB.
No
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Stop the unit.