Boiler appears to function normally with plenty of hot water, no fault codes, pressure 1.8bar but I cannot get any heating. The diverter valve appears to work ok as i can see it moving when i turn the hot tap on. I have cleaned the heat exchanger with descaler. Any ideas how fix this?

Chris, October 2009

do you have external controls ie room stat/prog? if your boiler is running ok on dhw the problem is most likely your controls on the c/h side

gas fitter tom, October 2009