Drayton RTS4 Roomstat Possible Fault.

[richimpulse]

Hi everyone, first post here and I'm looking for a bit of advice for my parents. I'm no expert with anything like this so I hope someone can help.
They are having a problem with their central heating where as soon as it reaches the thermostat temp setting it immediately shuts off and goes completely cold and wont come back on until the dial is turned up higher or the boiler is reset.
It's as though the thermostat is unable to keep the temperature constant.
The thermostat is a traditional dial style Drayton RTS4, and the boiler is the conventional type with separate water tank.
The roomstat is located at the top of the stairs on the landing, and seems to be talking to the boiler. When I turn the dial up it clicks and the heat light comes on and you can hear the boiler fire up, but once it reaches the new set temp it just cuts off again and never fires back up until you physically make it.
I have checked the timer/programmer settings (also a Dayton product) and all are fine, it doesn't matter whether this is set to timed, on or once, the heating will not stay constant.
I must mention that they live in a council house and have had their engineers out to look at the problem, but they claimed it is behaving normally? I know my heating doesn't behave this way!
Any help or advice greatly appreciated!

 

[flameport]

That does suggest the thermostat is defective.

The RTS4 can still be purchased, and can be swapped over in less than 60 seconds, no wiring required.
Switch off power, loosen the 1 or 2 screws on the lower edge, lift the thermostat upwards and away from the backplate, new one hooks onto the backplate at the top, push it over the screws at the lower edge, tighten screws to secure, turn power on.

 

[Agile]

You need to slowly turn the stat up and note the temp it turns on the boiler at.

Then turn the stat down and see what temperature it turns the boiler off at.

You say resetting the boiler solves the problem but don't bother to tell us what boiler make and model it is or how old.

Tony

 

[richimpulse]

Thanks for the speedy response!
I will pass the info onto my parents and let you know the outcome.
Are they common for failing?

 

[Agile]

You seem to have totally ignored the third line of my posting above.

Also to be fixated that the stat is at fault.

If it were then kindly explain why resetting the boiler would solve it.

Tony

 

[richimpulse]

You need to slowly turn the stat up and note the temp it turns on the boiler at.

Then turn the stat down and see what temperature it turns the boiler off at.

You say resetting the boiler solves the problem but don't bother to tell us what boiler make and model it is or how old.

Tony

Apologies Tony I did not note the boiler make as it did not have any obvious branding from the front, I will take a look tomorrow and report back.

The system was fitted around 12 months ago.

On turning the stat a fraction from 19 to 20 there is an obvious click and light, and turning back to 19 the light goes out immediately and you can hear the boiler go off again

 

[Agile]

So I would conclude that the unbranded boiler is at fault!

 

[richimpulse]

Good old council for you!
I believe they have already had work done to the boiler, but unfortunately i can see it being a battle for them to get anything resolved.