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Hi, hot water is switched off however when central heating is switched on, there is hot water too, can anyone tell me why this is happening g
 

centralheatking

Esteemed
Plumber
Ok, do you know the difference between a combi boiler or a conventional boiler ?
combi heats your water almost straightaway has no tanks in roof. conventional set up
is with roof tanks and a big cylinder in a cupboard somewhere upstairs...let us know
and we can help you. centralheatking
 

DuncanM

Gas Engineer
Likely that the valve with the big silver head that is at fault. You may have 1 or two of these valves, near the pump and or cylinder? Does this part sound familiar?
 

DuncanM

Gas Engineer
Hi. I would look at the valve with the brass bottom and white head. Looks like a 3 port. Probably stuck in the mid position.
 

Darren Jackson

Esteemed
Plumber
Gas Engineer
Advent Win
When say you have hot water when the heating is on. Do you mean the cylinder is still heating up whilst only in CH mode? I ask because you should have hot water regardless as to having the heating on or off. As you have a Y plan set up so you have a cylinder full of stored hot water, ready to use throughout the day as & when required and is normal. If however your cylinder is heating up when not in hot water mode then your 3 port motorised valve is more than likely to be faulty and not responding to commands.
 
When say you have hot water when the heating is on. Do you mean the cylinder is still heating up whilst only in CH mode? I ask because you should have hot water regardless as to having the heating on or off. As you have a Y plan set up so you have a cylinder full of stored hot water, ready to use throughout the day as & when required and is normal. If however your cylinder is heating up when not in hot water mode then your 3 port motorised valve is more than likely to be faulty and not responding to commands.
ok think I kind of get what your saying but, why do I have a timer box (not sure of the correct terminology), whereby I can set the time for hot water separately to the central heating To come on. Have attached image. I have also noticed that the actuator has now moved to ‘H’, whereas earlier it was set at ‘W’
 

Attachments

Gasmk1

Gas Engineer
Advent Win
It is controlled by the timer and the thermostats, but yours being a mid position valve means that if cylinder isn’t up to temperature you will get it to heat cylinder as well. Hot water always gets priority. Only way to change this would be to change valve or make it into S plan system
 
It is controlled by the timer and the thermostats, but yours being a mid position valve means that if cylinder isn’t up to temperature you will get it to heat cylinder as well. Hot water always gets priority. Only way to change this would be to change valve or make it into S plan system
Thank you, I will get it changed to an S plan. I’m away from home a lot during the winter, therefore would not use the hot water, the only thing that I want running in the winter is the heating. Are you able to confirm roughly the going rate to change to a S plan.
 

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