Combi boiler CH problem

Familyman · 21 Oct 2005

Hi
I have a problem every time I switch on the CH (Timed or constant).
It fires up for about 30 secs and then cuts out. After a short period of time it does the same thing..fires up for about 30 secs and then cuts out. This continues for approx 20 mins where it will finally stay on continuously till the radiators get hot. There is no external thermostat connected.

Any Ideas?

ChrisR · 21 Oct 2005

Boiler is....?

Familyman · 21 Oct 2005

Boiler is a Potterton Puma 80.

gazthepottertonengineer · 21 Oct 2005

i bet its a puma and its got dripping hot tap syndrome

My crystal ball is very clear today

gazthepottertonengineer · 21 Oct 2005

told you i did actually type that before i read that post spooky hey

gazthepottertonengineer · 21 Oct 2005

check your taps mate i bet one of the hot taps needs re- washering

Familyman · 21 Oct 2005

Thanks
I've had a look round and can't see any evidence of taps dripping/leaking...even those that feed the washing m/c, although turning taps on does jump start the boiler even when they are turned off again ..although the cycle just starts over.

gazthepottertonengineer · 22 Oct 2005

sounds like your wax capsule needs replacing then

not the easiest job in the world even for a potterton engineer like myself

meldrew's_mate · 22 Oct 2005

Gaz, are these wax-stats available seperately, last time I tried I had to buy the whole diverter valve?

gazthepottertonengineer · 22 Oct 2005

yes you do have to buy whole diverter

where abouts in bucks are you

Familyman · 22 Oct 2005

Thanks Guys

Much appreciated!

ChrisR · 23 Oct 2005

Yes you can just buy the wax capsule. I'll send you one for about £25 inc post.

Not that it'll solve your problem, which is that your hot water flow switch is sticking on. Have a butchers at the pcb and you'll see there's a red light on even with the tap off, which there shouldn't be.

gazthepottertonengineer · 23 Oct 2005

sorry chris i cant see how this is the problm if the heat isnt getting to the rads

sorry but your wrong mate definate wax capsule needed if there are no dripping taps

Agile · 23 Oct 2005

As usual we dont get a very clear picture of whats happening but he did say:-

"""This continues for approx 20 mins when it will finally stay on continuously till the radiators get hot"""

I think that we must assume that the radiators ARE getting hot as he says!

This would make me deduce that the wax stat IS working BUT its doing so VERY sluggishly and needs 20 minutes without DHW use to get it to move enough to get the CH working.

The ChrisR solution to test that is to play his blowlamp on the front of the diverter for a few seconds to really heat it up.

Tony Glazier

ChrisR · 23 Oct 2005

Gaz you're right I'm answering the wrong post again. When I read it last it said something different. Didn't it?? Not sure whether to start taking the other tablets again or stop these purple ones.

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Combi boiler CH problem

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