No flame detected – Heater will make three attempts at ignition before the control goes into this lockout condition. Will reset in 1 hour.
- Watch the igniter through the observation window provided.
- If there is no spark, check the spark electrode for the proper ¼” gap.
- Remove any corrosion from the spark electrode and flame rectifier probe.
- If there is a spark but no flame, check the gas supply to the heater.
- If there is a flame, check the flame sensor.
- Check any flue blockage or condensate blocks.
