No hot water

[Rebecca]

I have a Halstead Ace Boiler, the central heating works fine but the hot water won't come on. Any suggestions!!!!!!

[htg engineer]

Could be a few problems

diverter valve stuck
diverter diaphragm split or stretched
faulty microswitch

Without knowing what you're doing, you'll struggle to diagnose the fault yourself. Call a heating engineer to take a look.

My guess would be the diaphragm in the pressure differential valve has split. If you know what / where on the boiler this is, you may be able to do some more checks. Let me know.

if i can help anymore i will