u did fit them on the hot pipework? No piont on putting on the cold. & ur sure there nrv. (single check non return valves) no slots to turn the water off on them. ya cylinder was changed ? which made no difference.
Are you sure you've fitted the non-return valves the right way around?
I have already had a new ball crane and a brand new hot water cylinder (with thermostat) fittednand none made any difference.u did fit them on the hot pipework? No piont on putting on the cold. & ur sure there nrv. (single check non return valves) no slots to turn the water off on them. ya cylinder was changed ? which made no difference.
It is the large water storage tank in the loft that is overflowing.as this is a long post i may of missed an odd point. it is the larger of the two tanks in the loft thats overflowing.& when it is overflowing the cold feed out of the bottom of the tank warms up if the cylinder is hot.
Forgive my ignorance , as I am not a plumber , but what is a blender valve and what is its purpose ?Not wanting to state the whats allready been said but u have to be getting mains cold into the hotwater pipework some where.This can happen if the heating tank isthe higher o the two & cylinder coil fails but ya new clyinder should of cured that, Can u think of any where in the house where the hot & cold r connected together some way. True mixer taps only backflow alittle when turned on & not when turned off as any leak would drip out of the spout. Sure theres not a blender valve under the bath.?
If u have very hot hot water & want to control its temperature before outlets .its like a large T with an adj/ knob on the top to adjust temp. Fitted mainly in nursing homes , hospitals & schools to prevent scalding. Have fitted in domestic houses when AGAs over heat water during the day so not to damage fittings such as shower pumps etc. Its a long shot but some where u must have a cross over of higher pressure than the hot.Ca u post a pic of ya cylinder cupboard. Its not easy from behind a screen if plumbers on site cant sort it.
Nice cylinder, shame the AAV is in the wrong place
Turn the cold washing machine valve off and see if it makes a difference.
List all the appliances that have mains cold.
List all the appliances that have mains cold.
List all the appliances that have mains cold.
All mains cold fed are :
Bath
Bathroom tap
Kitchen tap
Dishwasher
Washing machine (in outside garage)
Sink (in outside garage)
Outside tap (for garden)
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