Well the damn boiler has locked out yet again, before i call out an
engineer again, i had a good poke around insdie the boiler (have
previoously opened up to thoroughly clean inside).
Well i noticed one thing, the water pipe at the left hand side at the
front has two sets of wires going to small cylndrical sections
attached to the water pipe. the bottom set has the wires affixed into
blocks that push onto tabs on the cylindrical gizmo. the top set are
connected to a doodah which looks like a probe on the end that slots
inside the top cylinder section, this is covered in a white paste
which i am guessing is a thermal conducting paste. I can only imagine
that these must be monitoring the temperature. The point of this is
the top attachment is quite loose, and i am guessing making a bad
Looking for the best thing to do here, i have thermal transfer
compound (for cpu to heatsink), i was going to smother the probe in
paste push in as far as it will go and pump silicone in behind it
which when it goes off should hold it firmly in place. Or should i try
to source a replacement part that may fir in snugly ? or do something
Plumber, funnily enough did not leave the manual, just the thickies 1
page leaflet, basically saying for anything at all call out a
plumber/potterton engineer. Also had a hunt around on the internet
for a manual with no joy
Otherwise i would be in full faculty of the facts and not such a dumb
ass question :|
Will check resistance, any ideas on what impedance it should have ?
yep i am just trying a few cheap options first ....
I have one of these boilers. I didn't have the manual either. I contacted
potterton who sent out the complete documentation pack for no charge. Crap
boiler but reasonable customer service - in my experience.
Top device is the temperature thermister.......thermostat if you like.
Bottom one is the overheat thermostat.
By all means look for loose connections but really you need to add a little
Will the boiler run after you have reset it?
When does it lockout?........on start up.......when up to temp.......other?
Try and find a pattern.
OK, well i'll try my best to give a full picture.....
boiler started going from very intermittent lockouts to a very regular
occurence over a period of several months, had been asking an
acquaintence (corgi reg/plumber) to come around to have a look - the
original installer being very ill with asbestosis, anyway he still
hasn't come around after about 10 months.
Things i have tried,
Bled all the radiators, no air at all.
increased air flow around boiler
just after the central heating was installed, my partner chopped in
the cable that was previously left hanging. having not covered the
room thermostat she managed to get a lot of plaster and debris into
the thermostat; i meticulously cleaned this straight after. I changed
this incase a very poor electrical contact was causing trouble
completely turned off the hot water function, to see if it was the hot
water coming on off at different times that was causing the problems,
it wasn't (or rather wasn't exclusively - i haven;t tried just hot
water running with no central heating) as the lockouts occurred just
turned the timer to continuous, to see whether it was the cycling that
was casuing lockoiuts, nope, just the same frequency of lockouts.
I finally managed to get the original fitter to come around (although
due to his illness i was led to believe he had long since stopped
work), had a quick look around and found that someone had partially
closed the bathroom radiator - the heatsink for the boiler; i know
this wasn;t me as it is the heatsink and should be left on full. He
then proceeded to fully open all radiators, which had taken me a long
time to balance up. Thought he had fixed it - nope very next day
the lockouts have no set pattern as such, but when the system was not
on continuous, it appeared to lockout on firing up, but it may well
have lockout the previous evening and you only feel the cold first
thing in the morning. However, a reset would work first time and the
boiller would continue for a long time before next lockout. SO ther
appears no obvious pattern. Short of having a webcam aimed at it
permanently to see when exactly it lockouts each time i don't know
what to do.
I have injected a small tube of thermal transfer paste as supplied
with my zalman heatsink into the temperature thermister opening and
thoroughly coated the probe, am awaiting my next lockout.
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