Carrier 40MPHA Service Manual page 39

F0 (Overload current protection diagnosis and solution)
Description: An abnormal current rise is detected by checking the specified current detection circuit.
Recommended parts to prepare:
• Power supply problems
• System blockage
• Faulty PCB
• Wiring mistake
• Compressor malfunction
Troubleshooting and Repair:
Check the power supply.
Is it in working order?
Check system for blockages .
Check the compressor resistance values.
Are they within acceptable
Check the connections and wires.
Are they properly connected?
Check the reactor.
Is it in working order?
Replace the outdoor unit.
40MPHA-03SM
YES
Do any exist?
YES
parameters?
YES
YES
YES
Specifications subject to change without notice.
NO Stop the unit .
NO Clear the blockage.
NO Replace the compressor.
Ensure proper connections or
NO
replace the wires.
NO Replace the outdoor PCB.
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