H1
Payne Reversing Valve or Mode Control Fault

Payne heat pump in cooling mode shows H1; system may not switch modes correctly or may short-cycle.

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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

Stuck reversing valve, Faulty reversing valve solenoid coil, Low voltage to O/B reversing valve circuit, Control board failure

How to Fix / Troubleshooting

Safety: Turn off power at the disconnect and breaker before working on the outdoor unit.

  • 1. Thermostat mode check: Ensure the thermostat is correctly configured for O or B type reversing valve (Payne typically uses O for cooling-energized). Incorrect setting can cause mode faults.
  • 2. Listen for valve shift: When switching between HEAT and COOL, you should hear a noticeable whoosh or click from the outdoor unit as the reversing valve shifts. If not, the solenoid may not be energizing.
  • 3. Inspect solenoid coil: With power OFF, locate the reversing valve solenoid on the outdoor unit. Check that its wires are intact and firmly connected.
  • 4. Technician diagnosis: A pro should measure voltage at the solenoid when calling for cooling/heating, test the coil resistance, and if necessary, replace the solenoid or the entire reversing valve assembly (a major refrigerant job).
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Repair Difficulty

Professional Required 5/5

Required Part

Reversing Valve Solenoid
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