False Flame Signal – The boiler will lock out if it senses a flame signal when there should be none present.
- Turn the gas off to the unit at the service valve.
- If the flame signal is still present replace the igniter.
- If the flame signal is not present after turning off the gas supply, check the gas valve electrical connection.
- If there is no power to the gas valve, remove the valve and check for obstruction in the valve seat or replace the gas valve.
- Turn the gas on at the service valve after corrective action is taken.
- Check for condensate back up. Condensate back up can damage the refractory wall, and if the wall falls against the rectifier probe, it may conduct the signal to ground, giving a false reading.
