Penster, you're a girl!!! condesending font switch = ON
ChrisR said:
I'd look carefully at wherever the water leak is, they quite often matter eventually.
I didn't know there was a water leak, couldn't see the wood for the Joes.
Seriously, the venturi tripping thing rears its head when on high gas rates, typically when drawing hot water, not sure if the low primary water switch trips the boiler (needing power off-on reset) or just turns off the boiler until flow is restored. The burner will, as someone said between Joe's ramblings, burn down at very low pressures, so the effect of even a severe gas blockage would be low power output (an issue to be resolved once the boiler works reliably), not failure.
In my humble opinion try the following with BG:-
1. Will it run for 5 minutes on DHW duty with the inner case off?
If so look at the venturi & air pressure switch.
If not go to 2
2. Are the ignition and flame detection electrodes and leads in good condition, clean, and properly gapped (Halstead provide uprated with replacement PCB - for good reason maybe)?
3. Look at the primary flow switch (the top one) is its clear cover discoloured, or full of water. If so change the microswitch.
4. Look at the flame on high fire (DHW) Does it lift off the burner?
If so have you a long (>1m) side flue? Does it slope slightly downwards towards outside? If not have them check the inner flue for corrosion which would cause flue gases to dilute the oxygen in the "fresh" air (in London?).
Can't think of anymore at present, though if Joe could get his dad to load in the brain patterns of a gas fitter......
I think he must have those of that bird that Compo fancies in LotSW the way he goes on.
I feel a retort heading my way....