Central Heating Comes On When Hot Water Only Selected

16/12/2012  · I have a Megaflow system with potterton profile boiler and Honeywell 9400 programmer.Up to now it was working fine .After draining the system to add fresh inhibitor , the central heating now only works when I turn on the hot water switch.The system was plumbed ...

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3/9/2019  · location: surrey. country: I have a gas boiler, Suprima 70, which has had a new control panel fitted by qualified engineer. This cured the lock out situation. I have recently noticed that although hot water only is selected, and heating is switched off, the rads all come on twice a day with the hot water. The thermostat is turned way down to 5C.

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15/9/2019  · If your central heating comes on with the hot water The valve is not sealing off the central heating port correctly. Hot water flows through your radiators when it should flow through the cylinder coil instead. If your radiators are always on but you have no hot water

13/10/2013  · Heating comes on with only hot water selected Discussion in 'Plumbers' Talk' started by DIYperson, Oct 12, 2013. DIYperson Member Hi, I have a fully-pumped central heating system which has been working fine and nothing has been touched. For the last 3 the ...

If the heating comes on when the hot water is turned on it is likely to be one of the following causes: S Plan System. Whilst the heating valve may be opening it is not making the internal microswitch which should bring on the pump and boiler. The valve itself is actually opening, but the boiler is not fired up.