CH always too hot

newdad said:
chaps said:
ChrisR said:
CHeck the DHW microswitch by pulling (one of )its wires off. Water ingress can make them short.

i would agree with that, it may be moving in the right direction at the right time but internally it may be constantly in the hot water possition, i changed one exactly like this a few months ago, it didn't click when moved by finger either, it should !!!

The DHW microswitch clicks when pressed by hand then the pump starts and it fires up. It clicks again when released. I can't easily remove one of the wires to check...

The CH microswitch clicks when pressed by hand but the pump doesnt start and the boiler does not fire up. (it does when the CH is turned on and activated by the plunger.)

I have also just noticed that pressing the DHW microswitch activates the plunger in the CH which in turn operates the CH microswitch - is it supposed to do this?

i think you should call in someone qualified as there ISNT a c/h flow switch, its a pump sensing switch and your getting a bit confused, either way call someone in who's qualified, im sure they can sort it out quickly for you, switch on PCB
 
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chaps said:
i think you should call in someone qualified as there ISNT a c/h flow switch, its a pump sensing switch
Well, if you want to split hairs over the name it's correctly referred to as the 'primary flow valve' (see parts arena)
chaps said:
and your getting a bit confused, either way call someone in who's qualified, im sure they can sort it out quickly for you, switch on PCB
Switch on PCB?
 
baxpoti said:
chaps said:
i think you should call in someone qualified as there ISNT a c/h flow switch, its a pump sensing switch
Well, if you want to split hairs over the name it's correctly referred to as the 'primary flow valve' (see parts arena)
chaps said:
and your getting a bit confused, either way call someone in who's qualified, im sure they can sort it out quickly for you, switch on PCB
Switch on PCB?

primary flow occurs weather heating or hot water in use, that particular diaphram/switch assembly is to tell the boiler that the pump is working and there is sufficient water in system, SO NO!!! im not splitting hairs, its not a heating flow switch.

and

switch "on" pcb should read "or" !! its a miss print.
look for sticking relay contacts maybe ???
 
chaps said:
primary flow occurs weather heating or hot water in use, that particular diaphram/switch assembly is to tell the boiler that the pump is working and there is sufficient water in system, SO NO!!! im not splitting hairs, its not a heating flow switch.

And "weather" is whats outside your house, raining or sun shining etc!

If you want to split hairs over what some in the trade call a CH flow switch then you should get your words right too.

They do that to make a distinct difference between the DHW flow switch and calling it a CH switch is a natural thing to do. We all know exactly what somebody is talking about and if you work in the trade then so do you.

Tony
 
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oh dear...

I bought a replacement PCB from ebay for £30 and it's exactly the same.

I then called in the corgi engineer that fitted the boiler and he too is completely stumped!

I am now forced into calling in Heateam to fix the problem - £299 fixed fee and they're coming tomorrow....ouch! :cry:

I'll post again to let you know the outcome.
 
People who fit boilers are rarely very good at repairing them.

It should not take much to fix it as obviously there is no major part failed so the £299 option is a very expensive one.

Are you really unable to find anyone local to you who is confident enough to offer a no-fix no-fee

I really dont understand how anyone can have the cheek to charge for their incompetence if they cannot find the fault!

Tony
 
I wish I lived in Tyne and Wear

Can't wait for the outcome!
 
Heateam came this morning. The engineer replaced the PCB and the valve and it's still the same!!!

He reckons that the CH system needs to be flushed - thats why the rads are too hot.

I'm rather sceptical - the DHW temp control knob still turns off the CH when turned down. surely the DHW control knob should have no effect on the CH??!!

Can anyone shed any light? am I right to doubt the advice?

Roughly how much should I expect to pay to have the CH system flushed?
 
Perhaps he is one of the Heat team engineers who used to cover Norwich a few years ago and couldn't fix anything here either :rolleyes:

Since coming on this site I realised that not many of them all know the same as baxpoti :confused: perhaps if they did then the heat team reputation would be better around my area and I could consider Baxi again :rolleyes:
 
Are you sure you fitted the diaphragm kit correctly when you changed it.

Can they be fitted the wrong way round for example, was it seated properly. Is water letting by and fooling the boiler into thinking it is the hot tap running. Did you reverse any wiring! The plunger may look as though it is rising but it may be that it does not rise enough and therefore keeps both circuits running. As you can see, I'm stabbing in the dark now. Just thinking out loud. :idea:

Check to see what you did was correct.
 
Ask Heateam to attend again and rectify the problem or demand a refund.
 
the payment is set up as a 6 month direct debit - I will not be paying anything until the problem is resolved.

Am I correct in thinking that turning the DHW temp control knob down should not turn off the CH??
 
sorted at last!

Another Heateam engineer came yesterday and sorted the problem.

Turns out it was a problem with the wiring carriage that links the PCB to the Temp Sensor.

thanks to all that posted suggestions.

Shame the first engineer that came couldnt diagnose the problem correctly - Imagine if I'd have paid to have my CH system flushed - I'm sure Heateam wouldn't have refunded the cost of this. I dread to think how many people simply follow their advice.

299.00 is a very expensive fix but I'm just glad to have it back to normal and it's covered for the next 12 months too.
 

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