Potterton Performa 24 Eco HE problem

[scoobyd00]

Hi,

I have a problem with the boiler. It's coming on but won't stay on. It extinguishes after about 2 seconds and continues to do this over and over.

I took the cover off and after some reading around, some mentioned it might be the microswitch. I looked at it and noticed that the pin was fully sticking out and stuck against the miscroswitch. With a bit of persuasion, I managed to free the pin so that it now retracts in and out without getting stuck. However, the problem still remains.

I did have someone out to take a look at it, but it seems that they didn't really know what they were doing and said that the heat exchanger has gone - I don't think that this is the case at all. The boiler is only about 3 years old. It was then suggested that it might be the air pressure switch and convent pipe? However, I think I'm being taken for a ride but I'm not getting on!

If anyone could help me I'd be very grateful.

 

[Andygasman2010]

So it cycles on/off every 2 seconds. Did you literally mean 2 seconds?

Does the burner definatly cycle on/off or could you just be hearing the fan cyling on/off?

That pin that was stuck against the microswitch may have been there for a reason, the pump will have been on so it probably wasn't a good idea to force it anywhere. Unless you were talking about the DHW microswitch (the one that rises/falls when you run a tap)

Either way I think the microswitches aren't worth looking at just yet.

Need more info tbh...

 

[petit_pablo]

Primary thermistor can cause repeated cycling.

 

[Beerlover]

So can a melted venturi - but that is suspected to be caused by a faaulty thermistor - ntc

 

[scoobyd00]

It turns on/off - by that I mean that through the pilot light hole, you can see the gas burners coming on. It clicks a few times, then ignites and then after about 2 seconds extinguishes. Cycle repeats over and over. This is when I try run the hot tap.

 

[Andygasman2010]

It turns on/off - by that I mean that through the pilot light hole, you can see the gas burners coming on. It clicks a few times, then ignites and then after about 2 seconds extinguishes. Cycle repeats over and over. This is when I try run the hot tap.

Does it eventually "lockout" with a fault light?

 

[scoobyd00]

No it doesn't seem to go to fault. I've tried to hold to reset but it seems to do nothing.

 

[Andygasman2010]

Next thing i'd be looking at is wether or not the fan cuts out as the burner does. Could be the APS dropping out or a PCB fault. All guess work though i'm affraid.

Probs best get an RGI in now. I've seen people throw parts at a boiler in the hope it'll fix it and it ends up being something silly.

 

[Agile]

I suggest you get a competent boiler engineer who offers a no-fix no-fee.

Tony