Our central heating has a Honeywell ST64OOC timer/programmer. We only use both the hot water and central heating controls at off or continuous. The diverter valve is the Honeywell V4073A.
Last week, the radiators would not get warm/hot except when the boiler was supplying the hot water system. Switch the hot water control to off, and the boiler would stop, even though the central heating control was on continuous and the radiators were cold.
We have a contract with Worcester-Bosch. The engineer came. He said there was no electrical supply to the boiler for the central heating. Our contract relates only to the boiler. He said the fault could be with the wall thermostat, but more likely the diverter valve.
I asked a local plumber/heating engineer to look at it. Apart from turning things off and on, he did not really check anything.
He said - and this is the real issue/question for the forum - that the boiler could not operate for central heating unless the slider switch for the hot water was also at continuous. I told him I did not believe that since we used both seperately, but he was adamant. He got the system "working" again by increasing the setting on the cylinder thermostat. However, we only have central heating when the boiler is supplying the hot water cylinder. As soon as the cylinder temperature is reached (or we switch the hot water off), the central heating also goes off.
I think the "physical" side of the diverter valve is working, but it it failing to provide an electrical supply to the boiler - perhaps a micro switch or something?
Advice/views would be much appreciated.
Thank you.
Mervyn
Last week, the radiators would not get warm/hot except when the boiler was supplying the hot water system. Switch the hot water control to off, and the boiler would stop, even though the central heating control was on continuous and the radiators were cold.
We have a contract with Worcester-Bosch. The engineer came. He said there was no electrical supply to the boiler for the central heating. Our contract relates only to the boiler. He said the fault could be with the wall thermostat, but more likely the diverter valve.
I asked a local plumber/heating engineer to look at it. Apart from turning things off and on, he did not really check anything.
He said - and this is the real issue/question for the forum - that the boiler could not operate for central heating unless the slider switch for the hot water was also at continuous. I told him I did not believe that since we used both seperately, but he was adamant. He got the system "working" again by increasing the setting on the cylinder thermostat. However, we only have central heating when the boiler is supplying the hot water cylinder. As soon as the cylinder temperature is reached (or we switch the hot water off), the central heating also goes off.
I think the "physical" side of the diverter valve is working, but it it failing to provide an electrical supply to the boiler - perhaps a micro switch or something?
Advice/views would be much appreciated.
Thank you.
Mervyn