V

Tip: Check the ceramic insulator is not damaged, this can cause the spark to earth, twist and pull the ceramic insulator to ensure it is not broken.
1. Check the gas supply to property and the inlet on the gas valve.
2. Check the low pressure when the gas valve opens.
3. Gas valve failing to open: check for voltage to the valve and for possible blockage on inlet filter of the gas valve.
4. Obstruction in the air intake to the fan leading to incorrect CO2 ratio. Diaphragm is damaged or stucked.
5. Condensate trap is blocked or restricted. Condensate pipe is frozen.
6. Flue is blocked or restricted.
7. Heat exchanger is blocked or restricted.
8. Check the burner for damage.
9. Check the spark electrode or the lead failure.
10.Check the flame sense or the lead failure.
11.Check the rectification ground (black wire to heat exchanger).