F09 Fault Code - Ignition Failure
HTP: F09 Fault Code - NO FLAME ON IGN: The boiler tried to ignite four times during one heat call and failed. The red FAULT light and LOCKOUT will flash on the display. This code indicates a serious safety issue. The boiler will not restart until the cause of ignition failure is repaired by a technician and he pushes the RESET button on the display. During this lockout fault, the pump will remain on as indicated on the second line of the display.
1. Watch the igniter through the observation window provided.
2. If there is no spark, check the spark electrode for the proper .196" (5.0 mm ± 1mm) gap.
3. Remove any corrosion from the spark electrode and flame rectifier probe.
4. If there is a spark but no flame, check the gas supply to the boiler.
5. If there is a flame, check the flame sensor.
6. Check any flue blockage or condensate blocks.
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