Set Appliance State:
Gas Off
Isolate Mains Power to appliance as per TOPs P4
Observation:
Remove and inspect the metal balance tube, that runs from the modureg on the gas valve to the boiler inner air chamber, for signs of damage or obstructions.
Also inspect the 'O' ring seal at the modureg, and the balance tube air chamber grommet, for signs of damage.
Refit tube after inspection.
Also inspect the 'O' ring seal at the modureg, and the balance tube air chamber grommet, for signs of damage.
Refit tube after inspection.
Isolate as per TOPs P4
and refit as necessary