510
Takagi
Abnormal Gas Valve Signal / Gas Valve Failure
Takagi controller shows error 510; unit will not fire.
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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
Defective gas valve assembly, Loose gas valve wiring connector, Faulty main control board output, Incorrect voltage to gas valve
How to Fix / Troubleshooting
Safety first: Turn OFF gas and power. Do not attempt to disassemble the gas valve body. Gas valve and combustion adjustments must be performed by a licensed gas technician.
Steps (visual checks only for homeowners):
- 1. Inspect wiring: Remove the front cover and visually inspect the wiring harness to the gas valve. Ensure connectors are fully seated and wires are not pinched or burned.
- 2. Reset unit: Turn power OFF for 1 minute, then ON. Attempt operation again.
- 3. Professional service: If error 510 persists, a qualified technician must test the gas valve coil resistance, verify control board output, and replace the gas valve or PCB as needed. Do not bypass or jumper the gas valve.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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