Worcester heatslave 26/35

[tpollock]

Hi,

Been out to this boiler but cant work out whats up with it. The heating only comes on when the hot water stat is turned fully off. when you switch on both the water and heating, The heat bank reaches temp then the boiler cuts off but wont switch to rads ? only when you manualy turn the hot water stat up (till it clicks) then back down again the diverter moves to rads ? Any help would be goot cheers.

 

[dontknowitall]

Sounds like the zone valve(s) is/are not operating properly. If you move the lever(s) by hand will they work then? If they do (but not on their own) then the motor probably requires replacing.

Just to confirm, is this an oil boiler?

 

[tpollock]

yep its a oil boiler, it has a built in 3 port diverter valve. It moves to heating but only when hot water is switched off. Does not move to heating when hot water stat reaches temp.

 

[dontknowitall]

So you need physically to push the lever to see if it then sends water to the heating circuit (when programmed to do so). If this works then you need to change the motor inside it.

 

[dontknowitall]

Just re-read your post ... possibly ignore my change of motor suggestion.

Has it always done this (or perhaps maybe it has but only just been noticed)? If so, it's probably a wiring issue in the wiring centre. If not, it could still be a wiring issue or a faulty programmer? I'd check wires first.

 

[ecowarm]

It a hard one to diagnose without being there, I think you may have to call somebody

 

[tpollock]

Rung worcester today and went through all the tetsting on the P.C.B and the tech guy seemed to think everything was ok. when i told him i wasn't convinced think i upset him. previous company charged the customer £400 to change a few parts ! (dont know what) and still isn't working. It would be easy to just walk away but its bugging me and i want it fixed. cheers for the help so far guys !

 

[kimbo]

Agree with ecowarm, it may be a faulty stat it sounds electrical, checking through the the feeds should show something up.
If the hot water stat is turned off that breaks the supply to allow the diverter valve to change to CH, therefore the supply must still be on demand for hot water and the boiler is switching off on the boiler stat. Just a thought.