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False flame signal – The heater 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.
