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!
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???
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?