Daikin
No Power Through Furnace Safety Circuit
Daikin gas furnace will not start at all; no inducer, no ignition, no blower, but power is present at the outlet.
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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
Blown low-voltage fuse on Daikin control board, Open door interlock switch, Tripped rollout or high-limit switch, Broken 24V transformer on furnace
How to Fix / Troubleshooting
Safety: Turn off power to the furnace before removing panels. Do not bypass safety switches.
Steps to check:
- Door switch: Ensure the blower door is fully closed and depressing the door safety switch. Some Daikin furnaces will not power the board if the door is ajar.
- Board fuse: Locate the 3–5A automotive-style fuse on the Daikin control board. If blown, replace with the same rating only. If it blows again, there is a short in the 24V circuit that needs professional diagnosis.
- Transformer output: With power on (qualified persons only), measure 24VAC between R and C at the board. If there is no 24V, the transformer may be failed and should be replaced by a technician.
- Safety switches: Check visible rollout and high-limit switches for manual reset buttons. If tripped, press to reset once. If they trip again, stop and call a technician—this indicates overheating or flame rollout.
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Repair Difficulty
Hard
4/5
Required Part
Daikin Furnace 24V Transformer / Control Board Fuse
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