H4
Camry Indoor / Outdoor Mismatch or Configuration Error

H4 error; indoor unit may not respond or may show erratic behavior

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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

Indoor and outdoor Camry units of incompatible capacities connected, Incorrect DIP switch settings on indoor or outdoor PCB, Wrong model code programmed into PCB, Faulty communication initialization

How to Fix / Troubleshooting

Safety first: Turn off power to both indoor and outdoor units.

  • 1. Verify model compatibility: Check the nameplates of both indoor and outdoor units to ensure they are designed to work together.
  • 2. Check DIP switches/jumpers: On both PCBs, confirm that capacity and mode settings match the installed combination as per Camry documentation.
  • 3. Power-up sequence: After correcting settings, power on the outdoor unit first, then the indoor unit, allowing a few minutes for communication.
  • 4. Reprogram PCB (technician): Some models require entering a model code via service remote or PCB buttons; this should be done by an authorized technician.
  • 5. Replace incorrect boards: If a non-matching PCB was installed, replace it with the correct Camry part.
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Repair Difficulty

Hard 4/5
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