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Mine did this last year and was the High Limit Thermostat....really easy to replace...top left of the boiler you'll see a heat exchanger with two looped pipes going into it and two sensors....replace the one closest to you...has two screws top and bottom and not a screw in type, that is the...

Removed both iso valves and they looked in good condition but gave them a good clean anyway and replaced them. Still can't find no return filter! What next?

WAIT! If the 22mm flow pipe is hot! and the 22m return pipe is cold...would this still point to iso valves?....reason I ask....return flow is cold before it hits the valve

How the hell can they get ****ed if they are open all the time???...I know you guys know best...but they don't open and close all the time!!! So...these are iso valves then?

iso valves are the two big brass valves that connect the flow and return to the boiler with square shaped adjusters?...if so...I have closed and opened them both a few times

Sat here with a monkey wrench, my blow torch and a hammer waiting to find out where the return filter is!!!! Oh! and Glasgow, can see now...got a miners lamp on!

[/url] Glasgow....sorry posted a new message so I could explain better....got the feeling you had given up on the prob...thanks for your help so far.

Whilst shopping for all these replacement parts I'll buy beer for you both too? :lol:

Where do I get a cheep pump from?....I got allen key tools...everywhere I called said they only supply full pump...Vokera told me it's pump or thermister!....now could be filter?....where is the filter???

LOL!...Where is the f***in filter then?

Hmmm...read that somewhere before....where is filter? can't see it on exploded diagrams??

I was going to replace the pump, but two things...pump seemed strong and not been quoted owt near £35!!! ps...I'm liking this handbags at dawn thing! lol

Because I initially thought the fault was sludged up rads....but when I flushed the water came out pretty clear....and also run the system for a day with Sentinal cleaner. Should I remove every rad and manually flush them?

I changed the one on the CH side...if HW side is working then why would I change that?....backing up your comment Harrogate

Any further suggestions Tony?

No valves have been touched, so can't have turned off...pipework seems pretty free when I drained and flushed the system...and how would boiler know to shut off so soon if there was a blockage? I know there is another one on the hot water side of the boiler....there is another sensor on the...

Hello Got a Vokera Compact 24 Boiler in a sealed CH system. Boiler works fine with hot water but when asked to serve CH it fires up fine but cuts out after 25 secs and keeps trying every 4-5 mins...no radiators are getting warm and the return flow pipe is cold...there is no external...

ok ok, sorry.... Nope...no other valves or thermostats How can I get rid of this air?....no drain off valves on boiler, aav when I first fired up seemed to shoot some air out then boiler cuts out...but does fire every couple of minutes....has to be air with the noises?....they are not big...

Cap is open....and I know misty water is harmless....but kinda proves air is in the system?....I have flushed system AGAIN...and lots of gurgling noises from boiler which cuts out after 25 secs!....return flow pipe is cold. I have bled rads and pump again...still no joy and can't get a...

ANYONE????