I'm passing this request along for a friend, so please forgive any
ignorance or mistakes on my part. The problem is with a Ravenheat CSI
85A combi boiler... it won't light (duh!).
The unit was self-installed, and has worked without problems for the
last few years. A week or so ago, the unit would no longer light
reliably. Turning on the hot water tap became a pot luck affair. If
you left it running for 20-30m, you might get hot water eventually. A
visual inspection of the boiler during this time showed the boiler
lighting for a few seconds, but then turning off again. It would, on
occasion, decide to light properly and deliver hot water untill the
tap was turned off again.
Since then the problem has gotten worse. Now the fan works, but the
pilot light will not light and the pump will not run. The fan only
works intermittently though.. it will come on for a few minutes and
then turn off for a few minutes.
The ignition board has been replaced, but it made no difference.
Does anyone have any advice on what may be wrong?
Thanks in advance.