Room Thermostat Problem

[Dunbar]

Had a Honeywell T6360 stat fitted a few days ago. It's working OK, but the problem is that it's not turning on and off at desired temperature according to stat. To obtain the desired temp I have to set the stat at 5 degrees lower. So for a temp of 21, I have to set the stat at 16.

Has anyone any ideas what could be wrong. Thanks.

 

[Whn1]

Here mate.

 

[ShaunCorbs]

Do you have the neutral connected?

 

[Dunbar]

Yeah, have neutral connected. As per the numbering inside stat, wiring as follows (excuse my less than basic knowledge).

Blue wire in terminal numbered 2 (2nd term from left), yellow in terminal 3 (3rd term from left), red in 1, 5th term from left. No wire in term 4 or in 1st terminal from the left not numbered.

Thanks for your replies.

 

[Dunbar]

Sorry WHN1, just read the diagram and calibrated against digital thermometer. I had tried to get the dial off before but thought it was secured on. Now pulled off and turned so click off = room temp and reset the dial. Job done. Many thanks.