hi.this is my first posting.can anyone help. this boiler is around 4 years old and is now a fully pumped selaed system.it has worked fine until recently when it appeared to start locking out.it may be a coincidence but a week or so prior to this, the flow and return pipe at about 15ft from the boiler developed a leak at the elbow and was repaired using a compression fitting but a freezing kit was used instead of draining the system. i had an engineer look at the lockout problem and he replaced the thermister and the overheat thermostat which bar the first night after the replacement has so far been successful. with winter coming up i am a little nervous and wonder if i should just sit tight or is there anything i should check out. i also have now learned that a thermal paste should have been applied to the thermister which the engineer did not do.i am quite happy to do it myself and wonder if you could advise exactly where on the thermister the paste is applied.
potterton kingfisher mf 90 btu boiler--lockout
- Thread starter clevin
- Start date
The paste is there to help transfer the heat onto the 'sensing probe' part of the thermistor.
unlikely but possible
Simple really, only small amount of water was taken out so the chances of any major sludge movements are slim.
thanks.i had a huge amount of plumbing work done about 18 months ago and not sure if the system was flushed out or not and if inhibitors added etc.not able to find out from plumber.is there a way of telling how manky the system is? certainly the water coming out when bleeding rads is clear but guess that is not the full picture.is getting the system flushed a good idea periodically?including towel rails there are 20 rads in our house of which 5 are older rads.are there risks to flushing?your advice would be greatly appreciated.
Simple things first; no risks in flushing. There is an urban myth that flushing can cause leaks. It can not, but it can reveal existing leaks that are plugged with dirt. Bit like a nail in a tire that stays hard.
Simple test, litmus paper; if under 7 it means your system is acidic and you can bet it is full of sludge.
It should have been cleaned when you got your new boiler, but is often not done at all or poorly.
Once it is clean and treated with inhibitor, provided you check annually that the concentration is okay, you never need cleaning again.
Most boiler problems are down to corrosion and limescale build up.
Simple test, litmus paper; if under 7 it means your system is acidic and you can bet it is full of sludge.
It should have been cleaned when you got your new boiler, but is often not done at all or poorly.
Once it is clean and treated with inhibitor, provided you check annually that the concentration is okay, you never need cleaning again.
Most boiler problems are down to corrosion and limescale build up.
Simple things first; no risks in flushing. There is an urban myth that flushing can cause leaks. It can not, but it can reveal existing leaks that are plugged with dirt. Bit like a nail in a tire that stays hard.
Simple test, litmus paper; if under 7 it means your system is acidic and you can bet it is full of sludge.
It should have been cleaned when you got your new boiler, but is often not done at all or poorly.
Once it is clean and treated with inhibitor, provided you check annually that the concentration is okay, you never need cleaning again.
Most boiler problems are down to corrosion and limescale build up.
Simple test, litmus paper; if under 7 it means your system is acidic and you can bet it is full of sludge.
It should have been cleaned when you got your new boiler, but is often not done at all or poorly.
Once it is clean and treated with inhibitor, provided you check annually that the concentration is okay, you never need cleaning again.
Most boiler problems are down to corrosion and limescale build up.
cheers for that bengasman.shall chase up some litmus paper--where's that chemistry set i used to have as a kid!! not sure if cleaned at time of instillation of boiler but i reckon the ph test may be revealing.how, incidentally do you check for inhibitor concentration.is there a way of telling if there is any at all? if above 7 do you reckon i should leave well alone as am a little reluctant to unplug any of these tiny leks that are probably in the most awkward places!
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