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Thanks they r 2 port valves I have 3 one controls upstairs one down and one near the hot water cylinder. How do I decide which one is faulty ?

I saw somewhere to tap zone valves I did with my knuckle and the light on the pump went out, but boiler doesn't appear to want to fire now?!

Sorry meant to add earlier the light on the pump a Grundfos UPS2 stays on all the time which I had not noticed before this situation arose. It is a new pump replaced 3 months ago

I am still getting HW & CH does this mean the zone valves are working or not? The boiler is firing whether the programmer is on or off!!!

Thanks how do I work out which is which

Still getting intermittent fault of not heating hot water when it should other times it does. Just checking it over and turned the CH & HW off but the boiler carried on working??? I also have noted the boiler will fire with both the CH & HW off when I turn up the boiler thermostat. Have I got...

Yes every year and by the same company.

Thanks for this how do check the zone valve it is situated beside hot water tank I do not understand mid valve never heard of it my system is 30 years old not all of it have had the zone valve/boiler/programmer replaced in that time may be it doesn't have one

Hi I have this programmer for a number of years this circa 15. It is set on constant fo CH and twice A day for HW. In the last couple of days when showering late in the the day the water is tepid. It appears that it is not heating the hot water on PM setting. Yesterday pm I put it on constant...