I have a Halstead Ace water heater, the central heating works fine but the water heater does not come on demand. The nipple that pushes out to make the HW switch does not push out when the water is turned on at the tap. It will pull out ok with pliers and does retract when the water is turned off. Any ideas?

Hamish Byrne, January 2007

reqs diaphragm easy job but some plumber will charge you probably 70 quid get instructions out and have ago.once you,ve done it once then never a problem again

paul, January 2007