As per title,my boiler goes throught the ignition sequence,fan comes on,burner ignites then 2-3 seconds later burner goes off and boiler goes into pump over run.
Been fine for 4 yrs no problems. System on fitment was all new,with Vaillant unvented cyl
Any ideas please?
Thankyou
Been fine for 4 yrs no problems. System on fitment was all new,with Vaillant unvented cyl
Any ideas please?
Thankyou