Discuss Combi boiler problem in the UK Plumbers Forums area at Plumbers Forums

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Hi this is my first post so please be gentle.
I have a Worcester greenstar 28i junior combi fitted in my house, we were having a troublesome drip from the back right of boiler, we found a gas safe plumber who come round and had a good look, he told me the back right hand block was leaking and needed to be replaced, we accepted and he said he would come back when the part arrives.
So the plumber came and fitted the big part, we paid him and he left.
Our boiler is set to preheat, seems to fire up every 30 minutes, anyway the first day we thought it's very hot in the house, how can this be the heating has been off for months. We checked the heating was set to off and it was. Now we never had this problem before the fitted the new part.
We contacted him and after about a week he came back round to take a look, he took a look at this and that but nothing. Now I had Googled our problem and saw a great video on YouTube of the diverter valve going up and down, I showed the plumber and low and behold the valve goes all the way down but doesn't go completely up.
He turned the valve off to stop rads getting hot and said he would look into this, as the diverter valve all came attached to the new back right hand block.
So could I kindly ask you clever people could it be a faulty or stuck diverter valve and as the valve doesn't go all the way to the top could this what is sending hot water to the rads when the boiler fires up for preheat.
I would appreciate any help solving this, as we paid £400 and the leak is fixed but we have red hot rads when boiler fires up for preheat.
Many thanks
 
Did he use the old diverter off the old block as tbh they normally work fine from new
 
No I think it was the old one.
Anything else that could cause this problem if it's not the diverter valve ?
Thank you

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He replaced something that looked like that ? Correct
 
Yes correct, but when he come back to see if he could locate the issue, he took green cover off the diverter valve, the needle/valve went all the way down but did not go right to the top

Yes correct, but when he come back to see if he could locate the issue, he took green cover off the diverter valve, the needle/valve went all the way down but did not go right to the top

Everything should be new so should work best speak to the gas engineer who fitted it
 
He has been out and had a look, and said the diverter valve is going all the way down but not getting to the top completely, he then turned a valve to stop the radiators from getting hot when preheat kicks in
Is there anything else that could cause this issue ?
Many thanks for your help

Diverter motor might be faulty or cheap second hand parts tbh never had a problem with new parts other than doa eg dead

Tried the old turn it off and on again

Water spilled on the pcb?
 
Diverter motor might be faulty or cheap second hand parts tbh never had a problem with new parts other than doa eg dead

Tried the old turn it off and on again

Water spilled on the pcb?
Neighbour had the exact same boiler installed when the lady who was in my house before me had her boiler fitted.
So been round to neighbours and taken a photo of there diverter valve with no hot water or heating called for, I think by the 2 pictures you can clearly see it is not going right up to the top thus still allowing hot water to escape through the radiators
 

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