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could be an intermittent fault - the programmer could be dirty (backplate) or relays inside worn/sticking etc - have you got a multimeter/used one before?

is the leak from the immersion heater connection? as the air bubble is lost, then the expanded water has nowhere for it to go so can cause a leak, but the expansion valve should OPEN and release the water/pressure - twist the prv/expansion valve and see if it is working your air bubble...

could be a faulty programmer - on the hw side - then not sending power to the boiler when a demand is made if there are no other controls do you have a wiring centre anywhere near the boiler/airing cupboard/where the pump is?

ok start again when you select hot water only at your programmer does the boiler fire up?

Makes no sense - pilot should also go out if boiler is overheating/main burner going out ...

what sort of programmer/timer do you have?? may be wired so you can't have h/w oin its own!

could be a rectification problem or gas valve fault even i'd checdk pump first - se if it's running properley - what speed is it on?

What faults did you come across? PCB's/air pressure switch/fan faults? I once went to a job with an old engineer who I worked with a few times and the Biasi had a new PCB fitted which was also faulty! No power to the air pressure switch!

there's so many posts I don't know where to begin! Some many boilers/models over the years

can you get your grips around the nut?

lol, fair play mate Installs is OK, but i like fault finding ... more of a challenge!!

Jake - do you know the cost of the combi 2 day course at Gastec? Don't get me wrong, I can swap a boiler - did my mums recently, swapped old Potterton and converted system to sealed. I just prefer doing repairs/breakdowns. Wiring's ok - on the boiler I fitted it had a pump overrun so needed...

ok thanks I'll sort that out :)

Yeah I have done plumbing - and boiler installs, but not on my own. I enjoy and like to do fault finding/repair on my own. I've been doing plumbing/heating repairs for a good few years, from ball valves to siphons to trvs to prgrammers to mv's to stats to leaks etc. I know they have a...

Hi Just a quickie - I have a Worcester Junior in my 2 bed house - it had a worcester digistat (wireless type that must;ve come with the boiler) with it (was there when I moved in ) - buit it wasn't very good and is now broken (dropped on wooden floor :( ) - I want to install a wireless...

if you have a multimeter you can check the reistance of the pump to see if it's running slower....

casn take pump head off - usually 4 allen key screws (4mm size) - then see if impellor is clean/intact and running smooth - don't forget to isolate pump at valves if any or drain down pipework if not - or as above - get an expert in

Jake - I've headr the 3 baxi courses are very very good - they are held in Dartford I believe.

the cold water tank FEEDS the F & E? where the water leaves the cold water tank to go to the F & E bung it

It's £400+ mate, but you are on a 3 month probation period. Am I'm not sure what that would entail? I don't do installs so am not sure if service/cp12/repairs would be acceptable in probation period?