Just Moved; Heating System Issues

ElectronicUser · 2 Oct 2021

Hi All,

I've just moved into a new house and have a few issues with the heating system. I had a completely different system before so hopefully you can me fix this one.

It consists of:
Boiler: Ideal icos
Programmer: Drayton Tempus Seven
Hallway Thermostat: Drayton RTS1

Next to the hot water tank is a pump and two electric valves (one seems to be for radiators and one for hot water to the tank).

The boiler is constantly showing a "C" and is coming on and off regularly to keep the water hot even though the programmer has the hot water set to off.

The pump is also constantly running 24/7.

How can I find the cause of these issues?

Thanks in advance.

muggles · 2 Oct 2021

One of the two motorised valves will either be jammed open or have a stuck microswitch. Usual remedy is to change the head

ElectronicUser · 2 Oct 2021

muggles said:
One of the two motorised valves will either be jammed open or have a stuck microswitch. Usual remedy is to change the head

Thanks.

The heating one seems to open and close fine so should I replace the hot water one or is there another way to find out which one is dodgy?.

muggles · 2 Oct 2021

How good are you with a multimeter?

kidgreen61 · 2 Oct 2021

Take the head off the other one to see if the spindle moves easily.
Quite likely that the microswitch is stuck closed in the actuator, this can be proved by seeing continuity on grey/orange wires (from that valve only, power safely isolated)

ElectronicUser · 2 Oct 2021

kidgreen61 said:
Take the head off the other one to see if the spindle moves easily.
Quite likely that the microswitch is stuck closed in the actuator, this can be proved by seeing continuity on grey/orange wires (from that valve only, power safely isolated)

So it should be continuity when closed and not when open on them both?.
Which one do you think it likely is?

Thanks

CBW · 2 Oct 2021

ElectronicUser said:
Which one do you think it likely is?

My money’s on the one that’s failed

Joking aside, we can’t really say for sure, that’s why it’s been suggested to test it.

ianmcd · 2 Oct 2021

ElectronicUser said:
So it should be continuity when closed and not when open on them both?.
Which one do you think it likely is?

Thanks

other way round continuity when the valve is open and microswitch made, open circuit when valve is closed

ElectronicUser · 2 Oct 2021

Thanks again for everyone's help.

The heating valve was the issue and the microswitch was stuck on as everyone said. Took it apart and the microswitch was visibly broken so gonna get it sorted.

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Just Moved; Heating System Issues

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