Honeywell Room Thermostat

[warehouseman]

Basic room thermostat (turn it clockwise to up temperature) in my hall has been inaccurate since fitted by gas engineer last year.
Was going to replace. Opened it up and at the moment the wiring is : BLUE wire to Terminal 2 , RED wire to Term 3 and BLACK wire to Term 1.

On the back of the stat there is a wiring diagram which seems to conflict. It says N to terminal 2 (with an arrow also to 3) and L to terminal 1.

Seems I've got old wiring but do you think it has been fitted wrong ?

 

[misterdubya]

Seems I've got old wiring but do you think it has been fitted wrong ?

No. Colours me absolutely nothing when it comes to wiring - especially in Heating Systems.

 

[namsag]

They are not that accurate at best of times change it for digital dt90 (£20ish) and just use existing wires to 1 an 3 and make wire 2 safe