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Posted 20 hours ago

Drayton MA1 3 Port Valve Actuator Head 230V, 27651

£34.495£68.99Clearance
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ZTS2023
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One side of the house, the radiators do get hot, Some of the other radiators don't, or at least take a long time (I've only recently put the hot water on constant). Pump is on flat out setting. This suggests that the radiators may not be balanced. There are 2 types of three port valves some have a mid position (Y Plan) and some don't (W Plan) the Y plan is more popular so suspect you have Y Plan. I had problems with my daughters old house, typical new baby so critical and a Sunday so had to find it parts required before shops closed at 4 pm. As an electrician I thought it would be easy, I found a wiring diagram for Y plan and tried to follow it.

formatting link When there is a HW demand but not a CH demand, the valve is un-powered and sits in the HW position. The boiler and pump are powered directly from the cylinder stat. Anyway having diagnosed this far I'm going to leave it with the central heating and the water heating on full time to see if I can get the temperature in the bungalow up to the expected level. When HW and CH are calling for heat at the same time, the valve moves to the mid position. The boiler and pump are still powered directly from the cylinder stat.

I assume if the 3 way valve was working properly and the heating side wiring wasn't requesting heating then the 3 way valve would be set to Heat and the central heating wouldn't work. However although I heard the main valve move and watched the plastic lever move, I haven't heard anything from the 3 way valve and the plastic lever seems to be floating. My son-in-law had tidied up the airing cupboard and had caught the leaver unlatching it. Result was when domestic hot water was required it motored open, but it did not open when central heating was required, however if the central heating was required then once the hot water was run, it would stay working until the thermostat turned it off again. If the boiler doesn't run when there is *only* a CH demand, it indicates either that the valve hasn't moved all the way to the CH position or that the microswitch isn't working. I have tried looking at past threads but have been unable to find an answer to my dilemma, so I apologise if this question has been asked in past.

If heating or water is called for the main valve opens and the 3 position valve moves to Heat or Water. If both are called for then the Mid position is selected which allows water to circulate to both. Is this something anyone has experienced or come across? If so, what’s the solution as I don’t want to fork out unnecessarily if it’s something simple to fix.The orange wire from the second microswitch is there to provide a 'live' to operate the boiler when the 'central heating only' is selected (it takes over from the cylinder stat which has this function for 'hot water only' and 'hot water and heating' positions). The orange wire is connected to the white wire by the second microswitch, to provide this boiler control signal but it does not have any effect on the actual positioning of the valve. For some reason later in the day, with the hot water off and the heating on, twiddling the thermostat does not cause the boiler to fire and the pump to run; I assume causing the pump to run is the critical test because the boiler usually fires a bit after the pump runs.

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