H0
Daikin Indoor Unit Capacity / Model Mismatch or Configuration Error

Daikin furnace shows H0; unit may not start or may run in a limited 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

Incorrect DIP switch or jumper settings on Daikin control board, Wrong model code programmed into PCB, Mismatched indoor unit and thermostat/interface, Recently replaced board not configured

How to Fix / Troubleshooting

Safety: Turn off power before adjusting any switches or jumpers on the control board.

Steps to check:

  • Verify model and settings: Compare the furnace model number to the installation manual and confirm that all DIP switches and jumpers on the Daikin PCB are set correctly for that model and capacity.
  • Check documentation: If the board was replaced, ensure the technician followed Daikin’s configuration procedure for that specific furnace.
  • Power cycle: After correcting any settings, restore power and see if H0 clears.

If H0 persists with correct settings, the control board may be incorrectly programmed or defective and should be replaced by a Daikin-authorized technician.

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Repair Difficulty

Hard 4/5

Required Part

Daikin Furnace Main Control Board
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