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I checked the pin and it does make the switch. I checked the installation of the diaphragm and the springs and they match the diagram that came with the spares. I have tried a number of connections and they seem secure. I need to identify the hot water microswitch. Can you help? Regards, Alan
Yes, the pin has a top hat on it which makes two contacts on a switch above when the heating comes on.
I do not know. It is listed as a Wickes 2000, Combi.
OK , if you take off that micro switch does the pin move out with hot water tap on ?. I'm trying to find the manual , not found it yet .
I went home last evening to check following our conversation. The heating works ok. The pin stays down. when I turn on the hot tap the pin rises and connects to the two sprung loaded contacts on the switch above and the water gets hot.
I turn the heating off and the hot water tap on. the pin rises as before and connects to the two spring loaded contacts, but the water runs cold and the boiler does not fire up.
Hope that helps.
You are right and it does. The radiators do not start heating till I stop running the hot water, but I need to start the boiler on the heating to get hot water. The diverter valve works as it should, I believe, but the boiler does not fire up when the heating is off and the hot water is turned on, even though the pin has risen up to press on the two contacts. The boiler only fires up when the heating is on and the thremostat is set above ambient.
IN which case what is the problem and how do I fix it?
I already repaired the diverter valve and it is working. So I had to call in a boiler engineer in the end. All he did was pack out the top hat with a bit of foil and the boiler fired. It seems that the rubber in the top hat had worn and was not pushing up enough to make one of the microswitches work. in essence your advice about changing the diverter valve would have cost much more and still not resolved the issue.