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does the motor on the boiler start? sounds like the overheat stat tripped if lack of water did you try reset its under the black plastic cap

As above but first press the pin in valve to check you dont get water coming out due to split diaphram in the vessel :wink:

NO you dont need to use ptfe :D

Im registered with oftec i dont install and run i have installed these and not to bad but to commission and goto breakdowns on these are a pig :twisted: If you are a sevice breakdown engineer we dont need to tell you why... For me i like the grant so much room to work on and engineer...

combi boiler is more eficcient to run and you can drain system an do a air presure test before presurising new boiler so if there is a leak its air not water leaking? you loose lots of space getting rid of loft tanks and hot water cylinder BUT with a combi if it goes wrong you have no...

A corgi guy should be called to check it sounds like you over presured it with the key the presure valve should have opened at 3bar so that should be checked If you have a drain off on a radiator drain some water out of the system through a hose till the presure is 1 bar

I have worked on them :lol: Heap of sh+t :twisted:

You can change the bearings but not that easy for a diy,you kan change the motor easy just a couple of screws :lol: Check the drive coupling is in tact but im sure that was checked when the pump was changed :wink: :D :D

can i buy the old burner on ebay? as will be good for parts :lol:

you can always use a wireless room stat rather than running wires and grooving out walls :idea: Leave the old stat to cover hole(not working) or fill hole if you havnt decorated??

did you look to see if the pin frim the diaphram was sticking and not making cintact with the microswich i tend to check the diaphram when i replace the m/swich ?

I think that sometimes a job is overpriced when you get a customer thinking they know the job more than you telling you how much the boiler is as i have checked on ebay... i go to one supplier for boiler materials not got time for searching different places for a few quid.. I bet these...

Yes you could disconnect heating pup and see if it runs?

Best solution is to pressurize system as they have the loft space taken :wink:

Have you the MI on how to fill the system to make sure your doing it right?

4x2 a small 6" long :lol:

As above and did you change/check drive coupling

When it does come on does it get nice and hot all over? If so rules out a flow problem You can sit a thermostat on the valve to see what the temp is when it goes cold and do you have anything in front of rad that can conain heat like a rad cover or sofa ect

Depends if the boiler has been sealed or weather you have a f.e. tank in the loft? Where is your heating pump on the flow or return? Do you have fully pumped or gravity dhw?

sry not knocking you we live in different areas and different rates seem to apply in different areas(overheads house prices e.c.t.) Apart from 1 church mag(editor gets a free service :wink: ) i don't advertise either.. I do tend to do it a lot cheaper 4 existing customers with a cup of tea...