Worcester Heatslave 15/19 Combi Intermittent CH

[Sotontotton]

If anyone can give me some pointers it would be appreciated.

I have a Heatslave that is having intermittent problems with CH, but the HW is fine. I ended up replacing the complete diverter so not just the head but whole body and also replaced afterwards the pump.

The problem is some times the radiators are hot when the boiler is running, but mostly they are luke warm. If I feel the pipes either side of the pump they are cold. If I feel the pipe at the back of the boiler labelled 'rear of appliance' it's red hot so is the heat exchanger and the pipe coming out of the heatslave to the 3 way diverter. I have tried manually controlling the 3 way valve, but the behaviour is the same. Its as if the flow is coming from the rear pipe, through the heat exchanger then out the pipe on the top of the heat store.

I have tried switching off the HW from the programmer on the boiler and just triggering the CH but it makes no difference. The boiler is firing, pump circulating ok. I've made sure I've bled air from the 3 points on top of the boiler and also that the autovent on top of the heat store isn't screwed shut.

Sorry for the long winded post.

 

[Sotontotton]

 

[SimonG]

Gets expensive just chucking parts at.

Get a good oil guy in.

 

[Sotontotton]

I'm thinking now it's an airlock as the 3 way valve and pump are fine. Can an airlock cause intermittent heating on a heatslave with cold pipes either side of the pump and hot water coming from the back of the boiler pipe labelled 'rear of appliance'.

If anyone has come across this give me a shout.

Cheers guys.

 

[Sotontotton]

Bought a power flusher off ebay for £100 and thats fixed the flow issue in the boiler. Guy picked tbe flusher up today and paid £250 so great result.

I dont think good oil guys exist in this country.

 

[sammathias]

I dont think good oil guys exist in this country.

Well you fixed it so a big gold medal for you sir. Be sure to sit your oftec training so you can give us undereducated folk some pointers.

 

[Sotontotton]

I heard it's quite easy to get oftec accreditation as to qualify you just need to turn up ☺

 

[SimonG]

So from 9.46 on Thursday morning to midnight on Friday you managed to get hold of a power flusher, which you didn't need, fix the so called problem and then sell it again.

This is after changing the divertor and pump.

ROFLMFAO

 

[DaveyHep]

I dont think good oil guys exist in this country.

You’ll not bother coming back with your next problem then.
But we know you will.....under a different name.

 

[Gasmk1]

amazing really when i bought my powerflush machine took a week for delivery and when i sold it took a week on eBay obviosly the OP is a time traveller. or a wizard no i will settle for numpty

 

[Best]

The OP has no interest in using a “good oil guy” as he obviously doesn’t want to pay any money.
So instead, he guesses what is wrong and pays a lot of money for expensive parts which weren’t faulty.