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Plumberpro
Plumberpro, Home Appliance Technician
Category: Appliance
Satisfied Customers: 634
Experience:  Heating and hot water heating appliances experienced
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Honeywell y plan system, time clock is set on hot water and

Customer Question

Honeywell y plan system, time clock is set on hot water and heating twice, but when clock turns off at set time, heating light on the clock sometimes stays on. I have tried a new time clock and a new three port valve.The wiring is the same as its always been and this fault has just developed.The clock is a Siemens rwb2e and the valve is a v4073 the cylinder stat is on 60c the boiler is a Viessmann Vitodens 100. The system all seems to be working as it should but the heating could be on when it should be off.Can you help any suggestions.
Submitted: 1 year ago.
Category: Appliance
Expert:  Plumberpro replied 1 year ago.
Hi , does the heating actually stay on all the time? Or is it just the light. ?
Customer: replied 1 year ago.
Yes when the heating light stays on, the actual heating is also on. But the light does not stay on every time sometimes it all goes off as it should.
Expert:  Plumberpro replied 1 year ago.
Hi , sounds like a fault with the clock . The internal components do fail after a while. What model is it?
Customer: replied 1 year ago.
The clock is a Siemens RWB2E and this is new and just been fitted which is what i originally suspected, like you, that is the reason i also fitted a new 3 port valve - V4073 Honeywell - as the new clock did not remedy the fault.
Expert:  Plumberpro replied 1 year ago.
Ok , so you are all ok?
Customer: replied 1 year ago.
No the new clock and the new valve have not cured the fault .
Expert:  Plumberpro replied 1 year ago.
Hot water off, feeds back through the cylinder stat to liven up the white wire of the motorised valve to pull the motor right over and fire the boiler.Do you think the wiring could have been changed at all?
Customer: replied 1 year ago.
The wiring is the same as its always been .Are you saying the cylinder stat could be the fault and powering up the clock and boiler now and again?
Expert:  Plumberpro replied 1 year ago.
Well, the cylinder stat does have a roll to play in that when the hot water is off the motorised valve motor over to heating by the grey(not white,sorry)wire , but a strange one, and probably can only really be checked with a multi meter and tracing back what is live. .But it might be worth changing the cylinder stat, as you have changed the other components.
Customer: replied 1 year ago.
Thats what I was thinking, as the cyl stat is the only component left in that circuit .
So fingers crossed I will fit a new cyl stat and hope that does it.
Thanks for your help.
Dave
Expert:  Plumberpro replied 1 year ago.
Your welcome Dave.All the best ,Toby

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