i have a potterton puma 80e 10yrs old. Heating appears fine but tends to fire up run for a minute or two and switch off over and over. System eventually gets hot. New heat exchanger fitted in last 12 months. When hot water tap turned on it flows fine but only gets hand hot. 'superburner' ignites and makes all the right noises etc etc ........ any ideas

john, February 2007

replace your plate heat exchanger as it is blocked

steve, February 2007