boiler with mind of it\\\'s own

[doreenb]

I have an alpha 280 and it keeps coming on. Thankfully I have thermostatic valves on all radiators and have had to turn the rads off. I need to get it fixed and someone mentioned it was a faulty diverter. Anyone heard of this?

 

[kevplumb]

from the sound of it i would check hot water flow switch first

 

[ChrisR]

Yep - quick explanation of: If the HW flow switch is stuck ON (or has got wet) the boiler thinks a tap's on so it fires. If the Diverter Valve is still in the resting position (CH) then it's the rads that get hot.

 

[doreenb]

Thanks Guys,

I'll check it tonight but wanted to get Alpha out to have a look. I am being told that the repair will be over £400 which is almost a new boiler.

Doreen

 

[tazman]

Had an identical problem with my Biasi combi and it was indeed caused by the hot water flow micro switch on the divert valve becoming damp. Got a replacement from RS for a couple of quid. Hope this helps.

 

[doreenb]

Hi guys,

Thanks again. I live in Streatham hill, london. Does anyone know of a good plumber that can have a look without charging the earth? I don't think I have the confidence to change that switch and I'm not a plumber.

Thanks

 

[oilman]

Try www.checkatrade.com.

 

[doreenb]

Thanks all. I have just contacted Alpha who will send an engineer and the complete job including replacement of an expansion vessel, sorting the divertor valve and call out is just over £100 which is a little way off the £400 plus of the local firm. How can something vary so much by supposed professionals!!!!!!

Thanks again..

 

[stulew]

I am NOT advertising but I am a local(ish) CORGI engineer and will gladly help if you can't sort out your problem.