Potterton Puma 80e - Fault on CH.

[GodKnows]

Hi all,

Question for all the knowledgeable one's on here! Have a Puma 80e, turned on CH, boiler went thru the start-up sequence fully, fired up, then after about 30 secs it shuts down, with a sort of kettling noise coming from the pipe coming down from the heat exchanger, pump making a gurgling noise and very hot....

I assume that the overheat stat is kicking in and turning the boiler off as I leave the controls set to "On" calling for the CH. After about 7/8 minutes the boiler again goes thru the start-up sequence, relights for 30 seconds then turn's off again

Any Obi-one Kanobi's out there that can help me pretty please The DHW works fine by the way......

Cheers, in anticipation ...

 

[B.O.B DOLE]

try venting pump and also turn with a screwdriver if this fails remove wiring to pump and connect a multimeter to pump turn it to ohms scale and see what resistance you get look for around 335 if low like 35 replace pump

 

[GodKnows]

OK, thanks for that will try that today

 

[chrishutt]

I just checked the resistance across a couple of new 6 metre head pumps and they were around 200 Ohms. I guess a 5 metre head pump would have a higher resistance, but 335 Ohms?

 

[gazthepottertonengineer]

its almost certainly the wax capsule !! first check you havent got any dripping hot taps anywhere
then if you havent replace the wax capsule and sorted

 

[GodKnows]

Hi,

Where is the wax capsual then on the pump?

 

[gazthepottertonengineer]

just below it might be wise to get someone in to change it as they are quite difficult to do no dripping taps then

the easiest way to test if it is a problem outside boiler is to turn cold water mains off to boiler using the 15mm ballofix valve

 

[GodKnows]

Turn off cold feed then, what am i looking for, sounds, leaks etc?

 

[kevplumb]

what gaz is telling you is the diverter aint working
FWIW i agree

 

[GodKnows]

Hi,

Well thanks, i will have a gander at it in the morning, let you know how i get on.

Many thanks.....

 

[gazthepottertonengineer]

Turn off cold feed then, what am i looking for, sounds, leaks etc?

your looking to see if your heating starts to work DOH

 

[ChrisR]

gaz - curious; why do you say its hard to change the wax capsule?