Potterton -Performa 24 - Keeps coming on - Micro-Switch Prob

[charlie567]

Tony,

The Engineer has just called and has stated that he must change the Mircoswitch before considering that the main board is knackered.

I have not much experience with boilers to be honest, but thanks with your comments to look at the microswitch

He is on his way in the next hour, so will keep you updated,

thanks,
C

 

[charlie567]

thanks for all your help guys

It was the micro-switch

it cost me £85 in total

all working now,

thanks again

 

[Agile]

You should have followed my advice a few days ago and it would have been sorted out sooner!

Its nice to see that this latest fellow was keen to properly diagnose the fault rather than just changing the expensive PCB. ( Or maybe he reads this forum and knew he could not get away with it ??? )

At least its sorted out at a reasonable cost now. Thanks for confirming the fix.

Tony

 

[charlie567]

thanks Tony,

Yep, l should have followed your advice and not assume that the pcb was at fault.

But lm pretty sure the guy rang for support first, as he turned up with the Micro-switch

Job done and it all works,

All you guys know your stuff on this forum, its a shame that lm just a beginner on boilers, but least l have learned a few things,

cheers
C.

 

[Ped106]

has the pin retracted back into the pressure differental valve ie not in contact with the micro switch assy.
microswitch [3 wire] in front of diverter valve,this can fail and power up the boiler.
a little more info please.
sounds like an easy fix.
see pic on www.partsarena.com/baxi/
muddle through to find your boiler preforma 24.
page 42.part key 103 shows micro switch removed and pin retracted is your pin retracted ?

Hi,

I think I am having this problem with my microswitch on the performa 24. The pin retracts fine when hot water is turned off but the burner is still going, playing around with the switch it will switch off. So I assume this is the problem. Just rang my local supplier and have been told its £17 +VAT. Is this a fairley simple job of just replacing the switch. I have looked at the wiring loom and can see where it needs to go, just wanted to check if there was anything I should be aware off before attempting to replace the microswitch.

Thanks in advance

 

[Agile]

Its a common fault for the switch to fail.

Its quite a procedure to change it as it includes half the wiring harness.

Some people just connect the switch with a choc block although thats not really correct but it removes the risk of damaging the PCB !

Tony

 

[Ped106]

Thanks for the reply, your right thw wiring loom looks v dauting, i think i will give it a go, slowly. thanks again

 

[jarvs84]

Thanks for this - I have the same problem - just ordered a new microswitch for £6.49 on ebay.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=190633222699

I confirmed it was the microswitch by giving it a tap - this was enough to stop the boiler randomly firing up.

I can't comment too much as yet but it looks like the existing wiring can be pulled out of the old switch and inserted into the new one - therefore avoiding the need to touch the PCB. I'm saying this but I haven’t tried it yet

 

[45yearsagasman]

I can't comment too much as yet but it looks like the existing wiring can be pulled out of the old switch and inserted into the new one - therefore avoiding the need to touch the PCB. I'm saying this but I haven’t tried it yet

Good luck with that

 

[nhanvu]

You should have followed my advice a few days ago and it would have been sorted out sooner!

Its nice to see that this latest fellow was keen to properly diagnose the fault rather than just changing the expensive PCB. ( Or maybe he reads this forum and knew he could not get away with it ??? )

At least its sorted out at a reasonable cost now. Thanks for confirming the fix.

Tony

====================================
Hi Tony,

I wonder if you could help please.

I am having a problem of Potterton Performa 24:
The boiler is turning on ALL the time. i.e.:the CH is always on and I cannot control the boiler with all the Control buttons on the front panel , apart from turning the power off.

Would it be the same problem of the Microswitch?

and I can see that there are 2 different Micro-switches you mentioned in this and wonder which one is correct for this fault?
I can see on eBay these 2 Micro Switches and

which one below is correct?

The microswitch on top of the Valve - 3 way Assembly (Part 130 of http://www.partsarena.com/baxi/):
http://www.ebay.co.uk/itm/200735647...NX:IT&_trksid=p3984.m1439.l2649#ht_2348wt_702

or the DHW microswitch on the Pressure Differential Assembly (Part 103)


Thanks.

 

[gas112]

Its the micro switch at the front facing you (pressure diff valve)

 

[nhanvu]

Its the micro switch at the front facing you (pressure diff valve)

Many Thanks gas112.

I'll order this microswitch and replace the old one and find out if it solves the boiler Constantly-ON problem.

.

 

[nhanvu]

Its the micro switch at the front facing you (pressure diff valve)

Many Thanks gas112.

I'll order this microswitch and replace the old one and find out if it solves the boiler Constantly-ON problem.

.

Hi,

I've just been to PartCentre to order the Micro-Switch BUT they cannot find this part as it is not shown on the BAXI pictures!!!!!
Pictures on BAXI only shown the DHW Pressure Differential Valve, not the microswitch.

Does anyone know the Part Number for this DHW MicroSwitch?

Many Thanks.

 

[nhanvu]

Its a common fault for the switch to fail.

Its quite a procedure to change it as it includes half the wiring harness.

Some people just connect the switch with a choc block although thats not really correct but it removes the risk of damaging the PCB !

Tony

Hi Tony,

I am having problem of getting the DHW Micro Switch.
Do you know the Part Number for this DHW MicroSwitch?

Many Thanks.

 

[gas112]

www.partsarena.com/baxi

You will find the drawings and part numbers here , they are on the plumbcentre graphics as i ordered one the other week picture is away from the diff valve .
Might be in the wiring harness section