Baxi combi 105e. Boiler shows no faults.Hot water is ok but..
central heating....fires up & temp rises to full heat in 10 secs, then shuts off until temp hit min, then heats up again to full in 10 secs & then shuts off...this repeats constantly all day which will eventually give some heat to upstairs rads but ice cold downstairs.
Any suggestions?
Thankyou

Tony Doyle, April 2010

hi
sounds like you possibly have a blockage in the return to the boiler
some have a strainer on the return valve normally under blanking plug at front of valve.
if not that possible thermister fault.
take it you have checked pump is running correctly.

anonymous, October 2010

sounds like diverter valve possible system needs powerflush call if need help 07716249796

ammo, April 2010