Carrier
Reversing Valve or Control Logic Fault
Carrier air conditioner cycles between heating and cooling unexpectedly (heat pump models)
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Sticking reversing valve, Faulty reversing valve coil, Thermostat or control board misconfiguration, Shorted control wiring
How to Fix / Troubleshooting
Safety: Turn OFF power before accessing outdoor components.
- Step 1 – Verify thermostat settings: Ensure the thermostat is not in AUTO-CHANGEOVER mode with a very narrow deadband that could cause frequent switching.
- Step 2 – Observe outdoor unit: Listen for the reversing valve solenoid clicking when changing modes. Lack of sound may indicate a coil issue.
- Step 3 – Wiring check: Have a technician inspect control wiring for shorts between O/B (reversing valve) and other terminals.
- Step 4 – Technician service: Reversing valve diagnosis and replacement require a Carrier technician with refrigeration tools.
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Repair Difficulty
Professional Required
5/5
Required Part
Reversing Valve Coil
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