Vaillant VC182e Gerry spec boiler

Ok.. I got me a Gerry spec Vaillant vc182e boiler that tries to ignight... but she doesnt... It has a room thermostat and no matter what I do.. she wont fire up... To the right of the Temp and presure gagues is a small rocker swich which is known as the "Schörsteinfeger schalter" ( Chimney sweeps switch) By law over here, them pesky chimney sweeps visit 3 times a year and every 2 years check the cent heating for excessive emissions! ... ayways, hit the sweeps button and the complete system springs into action! So I assume that all sensors and switches in the boiler are correct and present or it would not ignite!... Has anyone any frigging idea what could be wrong? The room stat is ticking away nicely and has 24v going to it.. Its doing my head in and winter is comming!

Thanks in advance

prog/room switch is on summer this could mean heating is disabled (top dial on the prog/room) try turning it to the left one click and turing the temp upto 25

Thanks.. but I have tried every combo on the room stat....

Just tested the air pressure switch... thats fine...
Bled the flow sensor and differential part of the system ... checked all seals etc...

in "chimney sweep mode" it fires up and will run until I switch it off... so gas supply is fine... water is flowing freely.. no air leaks around the burner area...
3 fuses are in tact....

Switch it out of Chimney sweep mode and she goes to sleep....

Turn up the room stat to 30° and she tries to fire up for 6-7 seconds then she goes back to sleep...

sleeps for 5 minutes.. then tries to fire up again..

Turn down the stat to 20° so its below room temp and she sleeps...

. so from this, I deduct that the room stat is doing its job..

This is doing my nut in!

Sounds like it’s a controls issue need to test if the stats working

Which stats? ( I assume you mean a Thermostat of some type)... The "room stat" is working as it requests that the boiler switches on and the boiler obliges... only when it obliges, it does not provide a flame!

So when you turn the room stat for call the pump runs ?

The pump runs and the exhaust fan kicks in.... click click... then goes back to sleep..
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Now you guys aint going to beleive me....
I just taken my daughter out to get something to eat, come back in and the rads are warm!

Thank you so much for the advise..

Its nice when people help people and not pig and scoff at each other!!