H41
Panasonic Four-Way Valve (Reversing Valve) Abnormality

H41 displayed; unit may not operate correctly in heating mode.

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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 four-way valve, Faulty four-way valve coil, Incorrect wiring to valve coil, Faulty outdoor PCB output

How to Fix / Troubleshooting

Safety first: Isolate power before working on the outdoor unit.

Steps:

  • 1. Listen for valve shift: When switching between cooling and heating, you should hear a distinct click from the reversing valve. Absence may indicate coil or PCB issue.
  • 2. Inspect coil wiring: Check the two wires going to the four-way valve coil for secure connections.
  • 3. Check coil resistance (technician-level): With power OFF, measure coil resistance; an open circuit indicates a failed coil.

Replacement of the four-way valve or coil requires refrigerant recovery and brazing and must be done by a licensed technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Four-Way Reversing Valve Coil
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