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View the thread, titled "Worcester over heat on DHW." which is posted in UK Plumbers Forums on UK Plumbers Forums.
If water is coming out at that temp doesn't seem much wrong with plate IMO.
Isn't so easy on the Juniors, you have to take the hydraulic block out if I remember correctly. And tbh if you ain't got a new washer pack it's going to leak.
Mastermixlee
Gas Engineer
Can get the plates out on them if you cut the hot water outlet pipe. You can then wiggle it out the back down that gap (provided you've got clearance below the boiler to do it).
Though still would of gone the f5 trick personally to do a mini clean on it first.
And obviously check the vanes on the pump too to check no debris in there.
Don't see much else that can be suggested to be honest.
If thermistors are in range, pump voltage is constant when on demand, Ch runs fine, boiler modulates down etc, pump confirmed to not be cutting out etc then there's little else that can cause it.
But without checking and confirming all the above then it'll still be guesswork.
Though still would of gone the f5 trick personally to do a mini clean on it first.
And obviously check the vanes on the pump too to check no debris in there.
Don't see much else that can be suggested to be honest.
If thermistors are in range, pump voltage is constant when on demand, Ch runs fine, boiler modulates down etc, pump confirmed to not be cutting out etc then there's little else that can cause it.
But without checking and confirming all the above then it'll still be guesswork.
The only thing that puts me off doing the f3 trick is that wouldn't work on the water side. So if that's scaled up the only thing I could do would be replace it. And yes I've changed a few by cutting a pipe and squeezing it out. I'm always reluctant to replace anything with out being fairly positive it'll sort it, I do hate these kind of faults!
Mastermixlee
Gas Engineer
Whilst I've had plenty of scaled plates causing poor hot water performance I've never had scale on the dhw side causing boiler overheating, as the system side would be clear and modulate down based on flow and return thermistors.
Just my experience though.
Just my experience though.
I have had them before when the plate to plate is really scaled up and it makes all sorts of kettling noises with the boiler shutting down. It's not like that though with this one. Still not sure what to do next.
Think that's now £300 plus. Don't want to admit defeat!
On hot water mode the modulation is carried out by the dhw thermistor. The primary thermistors are basically high limit stats and should cut the boiler out before it over heats.
Nooooo! Worcester dont give you the small jobs dont give them these jobs.
Check the resistances on the thermistors (dhw)
Is there more than one dhw thermistor?
It’s not about giving it to Worcester. It’s about the best route for the customer.
But if he’s not able to sort it or diagnose???!
Just deleted that comment another one coming
@Millsy 82. Disagree all you like. Says a lot. If the cost of me repairing is more expensive then a Worcester fix. The options are new boiler or Worcester fix. For example, there is no way a normal engineer can fit a main heat exchanger in a Junior for less then a Worcester fix priced repair.
I pretty much said.
Dont give the work to the manufacturers. They dont give it back. Yes if you install 100 Worcestershire a year they will look after you but otherwise they couldn't care less if you get work or not.
Better money going into your pocket than theres.
As for if you cant diagnose it. Speak to tech it's free and if you know what to ask which has been said on this thread you should get to the answer.
Will Worcester pay your mortgage? How about baxi? Vaillant? No none of them will YOU need to earn money as well.
If I had that attitude I wouldn’t have any work. I’m busy because I’m all about my customers.
I do and the same customers keep coming back even after a fixed price repair because I have saved them money.
I agree it can be a good move to call in the manufacturer for a fix priced repair. I have done it my self but only when I know with out a doubt it'll cost more for me to fix it. It could be very embarrassing if the fault doesn't cost a lot to repair!
With regards to calling Worcester or any other manufacturers it can be hit and miss with them. They might have the answers on a screen in front of them but I'd say not many of them have hands on experience. I might be wrong. It's easy for them to say replace this and that but this and that can cost 100's!
Back to my question though..is there more than 1 DHW thermistor??
What about when your customers want an install do you say Go with Joe blogs plumbing as he will fit you a boiler for £100 where as I will charge you £500 so you save them money then.
They ask me to quote. I quote and tell them to get 2 more in to compare. On a repair I tell them it is this much for me to repair or this much for Worcester and I only do it with Worcester because there boilers are rubbish.
Yes it is.
Not really.
It seems that running a business now is all about saving your customers money so how is it different?
You should be charging a fair amount for a good job. Simple as that really.
I do. My mortgage is paid and I’m more than happy with what’s left. I don’t need to be greedy.
I'm sure that's how homeserve think or bg or Worcester or vaillant or any other big company. I dont want to be greedy let's give the little guy a chance. Hahaha like that will happen.
But I’m not Homeserve/BG/Worcester or Vaillant. I’m Harvest Fields! That’s my USP!
This giving jobs to these large companies is utter madness. Why are these jobs so expensive? It's not labour charges its 100-150% mark up on materials from them that make the prices so expensive.
You say it's too expensive hand it over to them they throw parts in that cost them virtually nothing pay someone a pants wage so either way it's a win win for them.
Large companies are ruining the world all in the name of profit and you guys are just handing it over to them.
You say it's too expensive hand it over to them they throw parts in that cost them virtually nothing pay someone a pants wage so either way it's a win win for them.
Large companies are ruining the world all in the name of profit and you guys are just handing it over to them.
I’m only handing it over to them if I lose the customer and at present I haven’t lost one. It’s a no brainer to help my customer out mate. That’s how I’m built. I will never change.
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