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Distemper! There are probably thousands of properties still with this ghastly stuff encumbering them, it now being the unenviable job of many an innocent decorator to have to remove. Distemper basically now survives on in two forms only; either flaking off at a touch (which is lovely) or else...

On looking through a schematic wiring diagram the only thing in the ignition chain so far unchecked seems to be the spark electrode. Is it likely that this could be damaged? The connection from the PCB to this part seems to be sound enough. But I will also check if there is air in the main pump...

The main case was not removed and all was firing up fine until a system draindown necessitated closure (for diverter valve replacement). Unfortunately some air must have remained in the pipes after this and this caused the boiler overheat cutout to operate. On bleeding this air off, the reset...

Can anyone suggest why my Potterton Netaheat Profile 60e boiler doesn't ignite? The fan runs and the air pressure switch is heard to operate - both the switch and the PCB being brand new components. The fan starts up in the normal way but no igniter action takes place. The igniter was working...

Here's a quiz for the heating experts! Boiler: Potterton Netaheat Profile 60e. Fan runs normally and pressure switch is hear to activate. But no ignition activation or firing up. This all since resetting after an overheating cutout. Both a new air pressure switch and new PCB have also been...

That's exactly what happened. Found the reset switch and all started up again. Clearly the boiler has overheated through air being in the system so removing this air must be the next move. Many thanks guys.

Thank you for your prompt help - it does seem coincidental that this trouble has started only after a system drain down. Although the boiler fired up at first, I don't believe enough hot water reached the cylinder to activate the thermostat before it shut down. The cylinder remained cold...

Due to the house radiators coming on when hot water only is required, I have just installed a new diverter valve. On firing up afterwards, the boiler then only operated for a few minutes (on hot water setting) before cutting out and dying. Nothing I can do will bring it back. There is a faulty...

Thanks everyone for your great advice. The caveat 'don't do it yourself' is a sound one - the wrong mixture of gas and air will give you a highly explosive bomb. My brother is gas safe registered and it is he that I was going to get to 'help out'. My concern was to obtain any parts first so as...

Hi gasafengineer - many thanks for the suggestion about the PCB. Not quite the solution I wanted to hear for if that component is suspect, checking by substitution (at app. £135) is a bit of an expensive play! I don't think the other symptoms you mention are showing - the pilot does extinguish...

Many thanks. Is the evidence strong enough in your view to risk going to the cost of a replacement control board?

Thanks for the reply - the model of boiler is a Potterton Netaheat Profile 60e. Just over 20 years old so not very young but, until this problem occurred everything was working effortlessly.

Hi Everyone, As a newcomer to this forum I have been reading with interest other folks' CH problems and am impressed at the enthusiastic help so willingly offered by experts. If I can possibly do the same on any topic, I will gladly do so. My own present question is what to do about a...