Boiler Gas Valve Troubleshooting

• Draft pressure switches.
• Draft hood limit switches.
• Limit switches.
• Other safety switches (opened by temperature or pressure, check the description of your device).

In case all safety is proven, your control board should be able to send opening signals to the main gas valve or light the intermittent pilot light (based on your boiler type).

The next step is proving the flame, which has to be detected by a flame sensor. In case there is a fault with the flame sensor, the cycle will restart. To avoid any major gas accumulation that could result in serious damage, once the flame cannot be proven the system will shut down for around 4 hours.

In case the flame is proven, the thermostat’s call for heat should be successful.

Standing Pilot Gas Valve

Compared to the methodology behind electronic ignition gas valves, there is only one difference with boilers that apply a standing pilot gas valve: there always has to be a pilot light on. Therefore, it is advisable to first check whether the pilot light is on.

If you are sure that the error does not come from a missing pilot light, follow the previously described methods (proving the safety circuits and the flame) to identify and solve your error.

In case you are still unsure of the underlying problem, call a professional, as working on such equipment can be hazardous.

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