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Diagnostic Tool · Free

Furnace Gas Valve
Troubleshooter

Diagnose gas valve issues step by step. Check voltage, pressure, and symptoms to determine if the valve needs replacement.

Gas Valve Troubleshooting Guide

Before replacing a gas valve ($150-$400), verify it's actually the problem. Most "bad gas valve" diagnoses are actually control board failures, wiring issues, or pressure switch problems. This tool walks you through the diagnostic steps.

Common Misdiagnoses

1) No voltage at valve — it's not the valve, it's the board or safety circuit. 2) Valve clicks but no gas — could be the valve OR a blocked vent/pressure switch. 3) Weak flame — usually gas pressure or orifice issue, not the valve. Check our error code guides for your brand.

FAQ

How do I test a gas valve?
Measure 24VAC at the valve terminals during a heat call. If you have 24V and gas pressure but the valve won't open, it's likely failed. If you have 0V, the problem is upstream (board, thermostat, safety switches).

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