Any Worcester Heatslave Experts?

[zaria123]

Hi Folks
I'm wondering anyone here, has any indepth knowledge on the Worcester Heatslave Combi Boiler. This boiler is quite old (2006) but it has been very reliable, and also runs at superb efficiency when tested, regularly serviced etc.

The boiler is in a very old stone cottage (built 1791), and to ensure the building doesn't get too cold, we have the boiler timer for the heating permanently on, and operating by the room stat.

However an issue developed whereby the radiators also heat up, when the hot tap is running. Even if the room stat is turned down to 5 degrees (the minimum setting)

The boiler has been checked, and the mechanical diverter valve was replaced, the motorised valve that controls it has been tested and working as it should. I've had two different engineers look at it and they can't figure out what the problem is (the first replaced the diverter valve). He spoke to Worcester, and they said the control board needed replaced. The control board was changed and the problem still existed (the control board was swapped back to the original and the part returned).

If anyone has any knowledge of these, I'd be delighted, as its now being suggested I buy a new boiler. The only other parts previously replaced on the boiler were the burner, and the expansion vessel.

Thanks

 

[Deleted member 120897]

I’m nit an expert, but t sounds like the diverter might be passing? Was the whole assembly replaced?

@exedon2 @SimonG might know this boiler and few others

 

[SimonG]

Do you have a picture of the front of it with the door off?

 

[SimonG]

Its definitely the diverter.

 

[zaria123]

Hi guys, sorry for the slow replied I didn't realise I had responses. Thanks for taking time to reply.
I've attached photos of the front with the door off.
The internal mechanism of the diverter valve was replaced with a brand new one. The brass housing wasn't replaced.
Could the internal mechanism be the wrong one?
It was ordered based on the serial number of the boiler.
Would changing the brass body make any difference, or perhaps could the motorised valve not be functioning fully?
I think I can check that myself? If I'm right you can see a white lever on the valve that should be fully one direction or the other depending whether the system is requiring heat or water?
Thanks so much

 

[Deleted member 120897]

What exactly was replaced? Motor, microswitch, both?

 

[zaria123]

What exactly was replaced? Motor, microswitch, both?

Only the mechanical internal spring mechanism of the diverter valve. The part the motorised valve moves up and down to divert the hot water or either radiators or tap. I've attached a photo (not maybe the exact one but looks like what I saw being installed)
That's the only part that's been renewed.

 

[Deleted member 120897]

Only the mechanical internal spring mechanism of the diverter valve. The part the motorised valve moves up and down to divert the hot water or either radiators or tap. I've attached a photo (not maybe the exact one but looks like what I saw being installed)
That's the only part that's been renewed.View attachment 83568

Sorry, didn’t realise it was that type. I’d still say it’s passing though. Might be the actual brass then, perhaps it’s not seating correctly.

 

[zaria123]

Sorry, didn’t realise it was that type. I’d still say it’s passing though. Might be the actual brass then, perhaps it’s not seating correctly.

Thankyou I will see if I can find someone who can check this, and ensure the motorised valve also if moving through its full range too.
I was concerned there might be other aspects of the boiler would make this happen.
Perhaps the part obtained wasn't the right one.
More investigation to be done I think.

 

[SimonG]

The cartridge was changed, needs inhibitor in as well to lubricate it. They normally go due to poor water quality.
Unlikely to be the head, only changed 2 in 15 years.

 

[Peter J Brown]

Defo the cartridge not seating, probably had bother getting old one out and it’s broke, leaving some particles to stop it seating, that’s all it takes