Luke warm water Halstead Ace High?

Last week we had intermittent hot water CH fine, we replaced the pcb board & still no change so we replaced the Diaphram, result water now on but only Luke warm even though the boiler has fired up!
Any ideas?
Julie, February 2013


done
blocked domestic hot water heat exchanger

kash, February 2013
link Click here to see other fixes for Halstead Ace High.