Cold Room U/F heating

[bobby62]

Could anyone offer some advice as to why a large room with underfloor heating is getting no higher than 14-16degC. The rest of the house is fine so the boiler must be operating correctly. The room temp is normally ok in winter and heats up sufficiently. Could there be air in the system, or the pump on the manifold not operating properly?

 

[Norcon]

Is this a conservatory area with large amounts of glass?
The temperature recently has been dipping pretty low! -5 here at the moment.
You could try increasing the flow temperature if an adjustable valve is fitted.