Hi Guys,
Hoping someone can help me, we have a 2-zone heating system that consists of 3 honeywell 2-port valves on a system/hot water tank gas boiler.
Recently the HW motorised valve broke - so I replaced it (motor/housing only) and problem solved. However when diagnosing this, I also noticed that CH2 ignores the thermostat and is always calling for heat. That is, when the thermostat is on 0 and the CH2 is on at the programmer, it's always firing up the boiler. CH1 is working correctly.
I figured it was probably the valve, so replaced that along with the HW valve while I was at it, however the problem remains exactly the same. So next I figured it must be the thermostat, so I replaced that like-for-like (£20 honeywell) and problem still remains the same! The thermostat is clicking correctly and my current buzzer shows it is certainly 'getting power'.
So now, I believe it must be either the programmer faulty on that single channel, or the wiring is bad, and has been bad since it was first installed? I've only been here 2 years and honestly not sure if this is a new or old problem - so the wiring seems more plausible?
Does anyone have any suggestions for diagnosing? Or should I just get a plumber in at this stage? I could buy a multimeter but can't say I'm confident with using/diagnosing it.
This is the system layout (attached)
This is the wiring box, black wires are the valves and the left hand side white cables are CH2/HW thermostats (attached).
Thanks for any help!
Hoping someone can help me, we have a 2-zone heating system that consists of 3 honeywell 2-port valves on a system/hot water tank gas boiler.
Recently the HW motorised valve broke - so I replaced it (motor/housing only) and problem solved. However when diagnosing this, I also noticed that CH2 ignores the thermostat and is always calling for heat. That is, when the thermostat is on 0 and the CH2 is on at the programmer, it's always firing up the boiler. CH1 is working correctly.
I figured it was probably the valve, so replaced that along with the HW valve while I was at it, however the problem remains exactly the same. So next I figured it must be the thermostat, so I replaced that like-for-like (£20 honeywell) and problem still remains the same! The thermostat is clicking correctly and my current buzzer shows it is certainly 'getting power'.
So now, I believe it must be either the programmer faulty on that single channel, or the wiring is bad, and has been bad since it was first installed? I've only been here 2 years and honestly not sure if this is a new or old problem - so the wiring seems more plausible?
Does anyone have any suggestions for diagnosing? Or should I just get a plumber in at this stage? I could buy a multimeter but can't say I'm confident with using/diagnosing it.
This is the system layout (attached)
This is the wiring box, black wires are the valves and the left hand side white cables are CH2/HW thermostats (attached).
Thanks for any help!
