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When I get a chance I will take a picture of the wiring, he has left the bottom screw of the plate off hahaha. The house was built in the 90's and the old tower three port valve was ancient. I have been in about 9 years. It could have originally been a different plan. The house has all sorts of...

I don't have the old one but it was like for like it was a Tower VAL322MP and I got the same one. I took a picture of the back of the old one before I got it taken out. It was the only way I could see what kind it was - by using my phone to reach round and take a picture of the back of it. The...

I don't know. I like the guy. The connector box is a mess. Nothing is marked up and it is a nest of wires. Not being able to see what it originally was like is a handicap as well. He does have a multimeter, that is how he knows that a wire in the room thermostat has a permanant live. If you...

The new three port valve has caused the issue with the central heating. The boiler no longer fires at all when the central heating is switched on. This only happened after the three port valve was switched. The same old pump was still in and the hot water issue remained the same. Changing the...

That is interesting regarding the reverse polarity. I got exactly the same three port valve (a Tower one) but the original one had been in at least ten years (since I moved in) probably a lot longer. Could the colour of wires now perform a different function to what they did back then?

The central heating did work fine. The hot water was the problem, it was taking longer and longer to heat up until it got to the point it was only lukewarm no matter how long it was on for. The boiler kept cutting out etc. This coincided with the pump getting noisier and noiser. The pump has...

I have got a heating engineer in and the hot water works now. It was the pump, it just needed replacing (if the three port valve had been left alone this would now be sorted). The heating engineer said the connector box (which is where the three port valve is wired into) is a nightmare as...

My pump started making a noise like an over revving car and it took an hour to heat the water instead 30 minutes. Over the weeks, the noise from the pump got increasingly worse and at the same time it also got to the point that even after an hour the water was lukewarm. The boiler would fire for...