Potterton Puma 80 water dripping from CH Temperature Sensor

[mike.talbot]

Hi Guys,

Water has been dripping from the Central Heating Temp Sensor on and off for months, however is now dripping more or less constantly. Have tightened it slightly, which made a temporary improvement, but alas its back to a constant drip.

Sensor itself appears to work fine, however looks extremely scaled up/corroded around the joint with the pipe.

2 questions before I drain the system and attempt to remove it.

1) do you think its just the o-ring behind that needs replacing or the whole sensor if it is badly corroded and cannot be cleaned up

2) Any ideas where to actually obtain a replacement o-ring, and does anyone have a parts number for it? Can find the sensor on most websites but no-one ever seems to stock misc parts like o-rings. Does it have to be a genuine part of can I buy something similar from B&Q etc etc..

Thanks

 

[clf-gas]

For the price of it, get a new thermistor, comes with fibre seal and change it whilst drained.

 

[mike.talbot]

Cheers for that - might just follow your advice, however can I just check Im looking at around £40 for a replacement - or am I barking up the wrong tree. From what I can gather the G.C part number is 337 322 and on the interparts website the o-rings are listed seperately, so dont want to buy the new sensor only to find I still have to buy an o ring hehe!

 

[superdupergasman]

or if you really want to save the pounds then....

PTFE tape on the threads of the sensor and screw it back in...

not pretty but it works!

 

[mike.talbot]

cheers superdupergasman - did think about that one, but with me being a relative amateur I was not sure whether I could safely use PTFE inside a boiler hehe! I am now going to give it a go though, if it saves me a few quid I'll be happy haha!

 

[superdupergasman]

cheers superdupergasman - did think about that one, but with me being a relative amateur I was not sure whether I could safely use PTFE inside a boiler hehe! I am now going to give it a go though, if it saves me a few quid I'll be happy haha!

Remember and let the pressure off the system befre you go unscrewing anything or you will end up with a unwanted shower!!

 

[Agile]

They very often leak for some reason.

Rarely on the DHW sensor which is just as well as they are so difficult to reach!

PTFE is fine!

Tomny