Huge difference between set and actual room temperature

[iMCaan]

We have water UFH on ground and first floor and both floors are screeded. 

 

In one of the ground floor rooms, the temperature rises to as high as 23 degrees with Salus thermostat set at 8 degrees (same as the other rooms) that's a huge 15 degree difference. In the other rooms the temperature is mostly around 10 degrees.

 

I've taken the room temperature manually and it matches the temperature displayed on the Salus thermostat so it doesn't appear that thermostat is not faulty nor is the Salus auto actuator, which comes on and goes off. 

 

So what could be the reason?

Why would there be such a high difference between the set temperature and the actual room temperature?

 

Thanks

[ProDave]

post the details of the exact thermostat.

[JohnMo]

I would check the thermostat settings and your controller.

 

If rooms are 10 degs and you have the thermostat set at 8 degs, where is your boiler call for heat coming from. More details needed

 

 

[iMCaan]

It's Salus  Quantum 230v Programmable Thermostat and Salus CB500 5 Zone wiring centre.

 

@JohnMo I need to think about this. How it works?

 

 

[JohnMo]

Which quantum model? There is one for UFH and one for radiators.

 

Do you have self learning stopping starting on or off?

[SteamyTea]

35 minutes ago, JohnMo said:

quantum model

The Copenhagen model allows for it to be both on and off, simultaneously.

The room temperature will only be revealed when it is measured. 

[Nickfromwales]

Ffs. 
 

I googled ‘model’ and ended up back here….. 

[JohnMo]

15 minutes ago, Nickfromwales said:

Ffs. 
 

I googled ‘model’ and ended up back here….. 

Two basic models, WQ610 is for radiators and SQ610 for UFH.

 

If you have a WQ on UFH and you have any self learning functions active, the thermostat loses all control as the algorithm is wrong for the application. A WQ will work with UFH, but only if you use in a simple on off mode.

 

Been there, done it, got the tee shirt.

[Nickfromwales]

15 minutes ago, Nickfromwales said:

Ffs. 
 

I googled ‘model’ and ended up back here….. 

👆

2 minutes ago, JohnMo said:

loses all control

@SimonD gets what I was looking to achieve. 

[iMCaan]

Thanks all

 

@JohnMo I have no idea how to setup self learning stopping starting or how to enable it. 

 

The thermostat model is SQ610 and the wiring centre is CB500 and auto balancing actuators are THB23031.

 

We've not yet moved in. Since there's no broadband yet, I've not installed the Salus gateway therefore I'm not using the mobile app or have anything programmed. The scheduled timer on the thermostat is not set. I've not played with any other settings on any thermostat.

 

Last night, I did some basic testing. Raised the temperature of every thermostat on the ground floor except for the affected room. All actuators came on except the three actuators for the room affected. The 3 flow pipes for the affected room were colder than the other room pipes to touch. After about an hour later I lowered the temperature on all thermostats to turn off the actuators.

 

This morning, the room affected temperature was 11.5 degrees. I raised the temperature to 13 degrees and the three actuators for the room came on. Will check tonight what the room temperature is.

 

Thanks

Edited Tuesday at 11:30 by iMCaan

[JohnMo]

So do you have an issue?

[iMCaan]

Yes, I still do.

 

I'm testing to figure out what is triggering the high temperature. Why it went as high as 23 degrees.

[JohnMo]

You have self balanced actuators, maybe it was just going through a learning period, some can take quite awhile.

 

With SQ610, you have a setting that optimises control to the Salus self balancing valves. Go on to Google and search for the full instructions for the SQ610, not the quick guide that comes with the thermostat.

[iMCaan]

Thanks, will read the manual

Edited Tuesday at 18:28 by iMCaan

[iMCaan]

A little bit of progress. Could well be a wiring issue.

 

I've found that the affected room (let's call it Sitting room) thermostat triggers Lounge zone. The Lounge room temperature keeps rising even though the temperature is set well below the actual room temperature. The Lounge thermostat only triggers it's own heating zone.

There's only 5 zones (including sitting and lounge rooms) on the ground floor. I've tested all 5 zones, one at a time, but none of them have started the Sitting room zone. 

Also, turned on all the zones on the first floor (each floor is a separate heating zone), radiators in the attic and hot water but not triggered the Sitting room zone. 

 

Investigation continues. 

[JohnMo]

Where is your boiler controller is it the sitting room?

[JohnMo]

But I would just delete all the zones, it's just going to make your heat source cycle and use more energy anyway. Zones add no value

[iMCaan]

1 hour ago, JohnMo said:

Where is your boiler controller is it the sitting room?

No, it's in the garage. 

 

It's a big house (so he says) so don't want to heat up the entire house/floor. Will test and remove the zones as necessary.

I did notice this morning that in the Lounge (L shaped), the dining and kitchen were also warm by couple of degrees. So it's likely, I reduce that one zone instead of three.

Edited 1 hour ago by iMCaan

[JohnMo]

3 minutes ago, iMCaan said:

No, it's in the garage. 

 

It's a big house (so he says) so don't want to heat up the entire house/floor. Will test and remove the zones as necessary.

Depending on the controller it may be configured as the master thermostat unless it's just a time switch. Your sitting room maybe has no zone control it's just an open zone. The controller may be asking the system to do stuff based on what it sees in the garage?

[iMCaan]

There's no thermostat in the garage. I'm not sure whether the controller has a built-in thermostat.

Edited 1 hour ago by iMCaan

[JohnMo]

23 minutes ago, iMCaan said:

controller has a built-in thermostat

What make model - boiler or heat pump?