34CRITICAL
Gas Valve Wiring (Lennox)
Lennox control board detected a wiring error in the gas valve circuit and will not proceed with ignition.
What This Error Code Means
The control board has detected an electrical issue with the gas valve wiring circuit.
Common Causes
- Gas valve harness disconnected
- Shorted gas valve wires
- Failed gas valve solenoid
- Control board relay failure
- Incorrect wiring after service
Affected Brands
Lennox
How ROMA Heating Fixes This
- Inspect gas valve wiring harness
- Test solenoid resistance
- Check for shorts in wiring
- Replace gas valve if internally shorted
- Verify correct wiring and connections
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Licensed Technicians
TSBC Gas License LGA0202903. Fully insured and WCB covered.
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