Cannot control UFH temperature

[Phil Giblin]

Thanks Sharpend . Yes , this is the one though I have these instructions but still can't resolve it. What I can't get my head around is why the UFH sensor doesn't cut off when it hits the set temp. Why does it continue to climb.?

 

[Murdoch]

Thanks Sharpend . Yes , this is the one though I have these instructions but still can't resolve it. What I can't get my head around is why the UFH sensor doesn't cut off when it hits the set temp. Why does it continue to climb.?

Get the installer back.....

As for a faulty controller, tell him to bring one with him BUT unless you know if it's set to floor or room sensor we are guessing

 

[Sharpend]

It would rely upon the electrician putting the floor sensor in the correct place. 

 

[Phil Giblin]

OK I'll speak to him again.Thanks very much for your help.

 

[Murdoch]

It would rely upon the electrician putting the floor sensor in the correct place. 

That's assuming the so called spark fitted one.

I suspect it's set to room sensor and as it's in a different room it is unlikely to ever turn off 

 

[Phil Giblin]

If so , can it be rectified ?

 

[Sharpend]

Why is the stat in a cupboard? 

 

[Murdoch]

If so , can it be rectified ?

Can what be rectified?

 

[Phil Giblin]

If he has set it to room rather than floor , can he switch the sensor to ' floor ? 

 

[kerching]

If he has set it to room rather than floor , can he switch the sensor to ' floor ? 

Begs the question why he didn't do it correctly in the first place?...or has the floor sensor been "accidentally omitted"?

just saying

 

[ProDave]

Underfloor heating will never heat a room

Yes it will, if done properly.

With these sort of electric mat systems though it is rarely done properly.

I bet the installer rolled out the mat, put some tile adhesive and stuck some tiles down.  so most of the heat goes down to heat the inter floor space.

To do it properly you need floor up, insulation laid, floor back UFH then tile.  I doubt many do that.

Done properly 1kW of floor heating will heat a room just as well as a 1kW panel heater, which should be plenty for a bathroom.

Why is the stat in a cupboard? 

If this is a bathroom it is common to have the control panel in an adjacent room, in this case a cupboard, with a sensor on the wall of the actual room.

 

[Sharpend]

Begs the question why he didn't do it correctly in the first place?...or has the floor sensor been "accidentally omitted"?

just saying

according to instructions floor sensor is optional? 

Yes it will, if done properly.

With these sort of electric mat systems though it is rarely done properly.

I bet the installer rolled out the mat, put some tile adhesive and stuck some tiles down.  so most of the heat goes down to heat the inter floor space.

To do it properly you need floor up, insulation laid, floor back UFH then tile.  I doubt many do that.

Done properly 1kW of floor heating will heat a room just as well as a 1kW panel heater, which should be plenty for a bathroom.

This may be true Dave but I have done several new builds with full insulated floors and still the electric Ufh never heated room. Yes you could feel a warmth but wouldn’t say it was sufficient for room, the moment someone opens the door the warmth is lost. 

I agree Dave controller in a separate room but I thought he was referring to the stat? 

 

[Phil Giblin]

I've asked the electrician to check whether the thermostat is set to room or floor sensor but he said he doesn't know how to do that ( ! ). Is there a link I can send him ? ( getting panicky now ! )

 

[Phil Giblin]

FTR , flooring was done in this order :

Plywood

UFH mat

Screed

Ceramic tiles.

 

[ProDave]

according to instructions floor sensor is optional? 

This may be true Dave but I have done several new builds with full insulated floors and still the electric Ufh never heated room. Yes you could feel a warmth but wouldn’t say it was sufficient for room, the moment someone opens the door the warmth is lost. 

I agree Dave controller in a separate room but I thought he was referring to the stat? 

My entire house is heated with wet UFH that heats the whole house properly and efficiently.  Even the living room is less than 1kW total heat output (whole house maximum heat demand is 2.5kW)   Done properly a modern house does not need a lot of heat.  Your experience just shows, as I still find that particularly "developer boxes" are still thrown together to poor standards and with no regard for quality or insulation detailing.

 

[Murdoch]

I've asked the electrician to check whether the thermostat is set to room or floor sensor but he said he doesn't know how to do that ( ! ). Is there a link I can send him ? ( getting panicky now ! )

he doesn’t know. God help his customers.

 

[Sharpend]

My entire house is heated with wet UFH that heats the whole house properly and efficiently.  Even the living room is less than 1kW total heat output (whole house maximum heat demand is 2.5kW)   Done properly a modern house does not need a lot of heat.  Your experience just shows, as I still find that particularly "developer boxes" are still thrown together to poor standards and with no regard for quality or insulation detailing.

I have also done a house in wet underfloor heating and that is far more efficient and is the sole heating for the property. I just don’t think the electric mats are as good :C  

 

[Sharpend]

https://support.gw-ec.com/upload/qa/2018/11/19/3019d10504894c7327d18fc07389bbe6.pdf 

this the stat? 

On section 9 of instructions you can set which sensor is used. 

 

[Phil Giblin]

I don't know how relevant this is , but I've found that if the temperature is SET higher than the current room temperature , then the heating comes on ( which I get  ). Then , provided  the room temperature stays below the SET temperature , the UFH stays on and the UFH floor temperature rises beyond the SET temperature. When the room temperature reaches the SET temperature the UFH switches off. So if the room temperature reaches the SET temperature fairly quickly then the UFH hasn't really had time to heat up before it switches off. I could set it much higher which means the UFH will stay on longer but I'm not sure how cost-effective it would be ? 

 

[SPECIAL LOCATION]

I've asked the electrician to check whether the thermostat is set to room or floor sensor but he said he doesn't know how to do that ( ! ). Is there a link I can send him ? ( getting panicky now ! )

:Chairfall     Sounds like someone was incompetent to design install and commission your UFH then...

and basically shouldn't be charging for a service they cannot provide!

That's assuming they supplied the kit? 

If its just installing something you had already supplied then its more your responsibility to know how it works..

How big is the bathroom?

how many watts per square metre?

Some general guidance about bathrooms & UFH.

https://www.heatmat.co.uk/bathroom/ 

Is it definitely a large enough mat for the room size?

:C