Thermostat not working on Ideal Independent C30 combi boiler

[thfcmad]

Hi All,

Im hoping somebody may be able to help me.

I have just moved into a property and it appears my thermostat does not work.

I can turn the heating on using the boiler, but it stays on until I turnit off.

The thermostat is a cheap looking digital touch screen one. The instruction book describes it simply as M9 Touch screen Thermostat. If I turn the temperature down it clicks, but my boiler carries on pumping out heat to the radiators. I turned the thermostat off (its mains powered) and even when it is turned off, my heating stays on.

Can anyone help me please? If any more information is required I can provide or is something been set up wrong and I will need to get a pro out?

Many Thanks

 

[Harry Bloomfield]

Deleted

 

[thfcmad]

Wiring inside my thermostat incase that helps.

Thanks again.

 

[RandomGrinch]

If you remove, for example, the grey wire from terminal 4 on your stat (and safely isolate it), does the heating remain on?

Also, this is a stat that can switch a 16A load and has a separate sensor connection; these are often used for controlling electric underfloor heating.
Is it possible that this stat is independent of the boiler?

Are there any other boxes, receivers or controllers dotted around the place, or on the front of the boiler?

 

[thfcmad]

I’ve not seen any other thermostats. This is in the hallway so makes sense to be one for the heating. Would be great to have underfloor heating but I don’t think so.
I’ve tried removing all power from the thermostat and the heating stayed on, would removing the grey wire alone have a potentially different outcome?

Thanks for your help.

 

[RandomGrinch]

I’ve tried removing all power from the thermostat and the heating stayed on, would removing the grey wire alone have a potentially different outcome?

If the heating goes off when the grey wire is removed, it could show that the relay has failed closed.

I’ve not seen any other thermostats

You may not have seen other thermostats, but it has been known for people to move out and take their Hive with them. Can you post a pic of your boiler and any boxes around it?

 

[thfcmad]

This is my boiler. House was refurbished before we moved in so there wasnt anyone here previously to take any other thermostats. Its only a small flat.

 

[thfcmad]

Removed wire you suggested and the heating is still on.

 

[thfcmad]

Ok. You can totally ignore me and you were also right. Just spoken to the person who refurbished it. The thermostat is indeed for underfloor heating in the bathroom. Who knew! He has also told me he forgot to add a thermostat for the radiators. ‍

 

[RandomGrinch]

Ok. You can totally ignore me and you were also right. Just spoken to the person who refurbished it. The thermostat is indeed for underfloor heating in the bathroom. Who knew! He has also told me he forgot to add a thermostat for the radiators. ‍

Brilliant!
Glad you got to the bottom of the mystery

 

[thfcmad]

So the question now instead is. Can I add a thermostat to this system?

 

[thfcmad]

A wireless one would obviously be preferential.

 

[Harry Bloomfield]

Ok. You can totally ignore me and you were also right. Just spoken to the person who refurbished it. The thermostat is indeed for underfloor heating in the bathroom. Who knew! He has also told me he forgot to add a thermostat for the radiators. ‍

Should s/he not be coming back, to install one?

 

[RandomGrinch]

So the question now instead is. Can I add a thermostat to this system?

Yes, and sort of no!
Your boiler has a "Room stat/timer" terminal block, where a connection to a stat can be made.
It's a simple job to remove a loop of wire, and make the connection (with a 4 core and earth temperature resistant flex).

Something like a single channel Hive, or a Nest could be connected simply.

The No, Ideal in their wisdom have placed these terminals behind the boiler cover; the cover forms part of the room sealing of the unit - if the cover is removed the boiler needs to be checked for gas safety afterwards, by an RGI.

 

[fixitflav]

He has also told me he forgot to add a thermostat for the radiators. ‍

"Forgot" is an interesting way of putting it