No flame detected – The heater will make three attempts at ignition before the control goes into this lockout condition.
- Watch the igniter through the observation window provided.
- If there is no spark, check the spark electrode for the proper ¼” gap. Use detail drawing of spark electrode as a gauge to hold ignitor against to check gap distance.
- Remove any corrosion from the spark electrod 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.
