Bolier doesn't always fire up!

[dan83590]

Hello

I have a problem with my combi boiler I think.

When the heating is switched on the boiler doesn't fire every time. It also doesn't fire everytime after hot water is used.

With a demand only for hot water the boiler fires up every time.

Is this going to be something simple or do I have to dig deeper and provide some more info?

Thanks.

 

[dan83590]

http://i123.photobucket.com/albums/o301/dan83590/Boiler/Image0027.jpg

http://i123.photobucket.com/albums/o301/dan83590/Boiler/Image0026.jpg

 

[dan83590]

No body here can answer?

 

[adlplumbing]

whats the pressure set at

 

[dan83590]

When cold it sits at 1 bar, when it 'is' going it rises to 1.5 bar ish.

D

 

[twgas]

Possibly something to do with the water valve/ microswitch assy. Best bet is to get someone in as these boilers are a bit beyond a DIY job.

 

[dan83590]

I'm quite handy..

I just need to know where to start. I'll start there.

 

[twgas]

water valve/ microswitch

 

[dan83590]

Cheers.

 

[mickyg]

check the diverter is making the microswitches when the pump starts up. Its a hydraulic problem. Could get around it by adjusting the rods that activate the switches on the DV, but that may just be hiding an underlying problem with the pump pressure. tbh you might end up needing someone who knows these boilers fairly well.

 

[dan83590]

Any Guru's here that could talk me through?

 

[twgas]

How "quite handy" are you?
What do you know about your boiler (other than how to use it)?

 

[dan83590]

Well I don't take them apart every day obviously. I have a rough knowledge of how the boiler works. I have the repair manual here, which I can flick through if needed.

I am a tradesman, have been for 18 years, not gas, but you do pick things up along the way. In my spare time I've rebuilt a couple of engines.

I should be able to handle my boiler, what do you reckon?

 

[twgas]

I've got to go to work soon, but will try to help first.
I will not help with anything gas related, so if it gets that far it's RDI time.
Remove the lower front panel, looks like there's only one screw, to the left of thermostat knob.

 

[dan83590]

Front and side removed.

Looks like its had a small leak in the past, no leaking now though.

Also have just noticed that the temperature gauge is missing.