Worcester Boiler Heatslave 20/25 Hot Water Not Working

[ianmcd]

Cheers - I've attached a picture of the control panel and normally the light circled in red would be on.

Yes, currently cold water comes out of the hot water tap when turned on.

That is your problem there, the controller is faulty, easily obtained and not expensive, the low water pressure was just a red herring, you only noticed the pressure was low because you lost the HW

 

[Deleted member 267285]

That is your problem there, the controller is faulty, easily obtained and not expensive, the low water pressure was just a red herring, you only noticed the pressure was low because you lost the HW

I thought this model of boiler was combi, my bad for assuming

 

[ianmcd]

I thought this model of boiler was combi, my bad for assuming

It does get called a combi, but like many oil so called combis, it has a heat store for HW which is passed through a plate heat exchanger when a HW demand is made, it is difficult to provide a simple combi with oil as you can with gas, but these boilers are decent, I have seen a few and the customers love them, there are others on here with far more experience of them than me, I have worked on a few but would hardly claim to be any kind of expert

 

[poggibonsi]

Thanks for the help - will take a look into the replacement control panel.

In the meantime is there any way of manually triggering this - I suspect not but worth asking.

 

[ianmcd]

If you are comfortable with electrics then yes an easy temp fix , or perm fix if you dont actually time the HW , which most dont

 

[poggibonsi]

If you are comfortable with electrics then yes an easy temp fix , or perm fix if you dont actually time the HW , which most dont

Cheers - comfortable with electrics so happy to hear any suggestions you can give on a temp fix.

 

[ianmcd]

OK on the back of the controller (sorry cant remember off hand the terminal numbers) there will be a wiring diagram with HW COM and HW NO, take the wire from HW NO and put it in the HW COM , and the HW will work , you wont have any control by the programmer though, but it is just exactly the same as switching the HW to constantly on , you do this with the power isolated obviously

 

[poggibonsi]

Cheers for the info Ian - understood, will give that a go.

 

[oilhead]

Your controller has flying leads, into a connector block on the PCB. This is the easiest place to put your link. I think you will find the terminals marked on the connector block, but if not, the diagram is on the Worcester web site.
Whilst this is a basic Honeywell controller, it is modified by Worcester for connections and consequently costs about £150. If you want to replace with something cheaper, then you can wall mount anything and connect to the PCB.

 

[ianmcd]

This will work on yours , I know it is not listed as your boiler but it is the same

https://www.ebay.co.uk/itm/Worceste...653892?hash=item4db14643c4:g:axYAAOSwrb5fMBhG

 

[Terrywookfit]

All the Worcester progs are overpriced and crap.

A couple of meters of suitable flex and mount prog of choice to adjacent wall.

 

[poggibonsi]

Thanks for the additional info all, much appreciated.

I can see where the programmer wires go into the main PCB board as follows, but not sure exactly what I need to change to do a temp fix, happy for any input.

 

[oilhead]

Put a link between br and w and hot water will be permanently on. If you want the ebay unit, put in a cheeky offer of £10 or so. You get no guarantee with it and you don't know how old it is.

 

[poggibonsi]

Thanks all - just an update - temp fixed now applied and working, thanks for everyone's input, much appreciated.

I think I'll install one of the smart stats at some point but will just keep the temp fix for the time been.

 

[ianmcd]

Thank you for updating us too many dont bother , will be good advice if someone else has the same problem and searches the forum