A week or so ago our central heating remained on after the timer had gone off we manually turned the heating off. After this we had no central heating at all but hot water was working fine. Consulted a plumber who told us the problem was the actuator on the central heating valve which we have since replaced. Now we are getting heat in some radiators (mainly upstairs) but all our downstairs radiators bar one are not getting heat-all these were working fine before we had the initial problem.
Also the boiler will only stay lit for as long as water in the tank needs heating, once this reaches temperature everything shuts off including the central heating. Have you got any ideas what the problem could be?
My first question would be to ask if he drained down the system to replace the valve? If he did it would seem reasonable to suggest air is still trapped in the system preventing radiators from heating fully.
The second problem seems like an electrical fault. Has he wired the new valve in correctly?
The Boiler is a Stelrad Ideal WLX and we have only replaced the actuator with a Sunvic SM5203 which was a like for like swap, we haven't touched the valve.
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