In article ,
wrote:
I have a Honeywell Room Thermostat in the lounge which has two wires
(each with a red and a black inside so four inside) which go to the
heating control box in the airing cupboard.

Older thermostats have three 'mains' wires - ignoring the earth. A live
feed, a neutral, and a switch return to the pump. The person wiring yours
should really have used a triple and earth rather than two twin and
earths. One wire out of the four will be unused.

I can't see where these should connect in the airing cupboard.

In the airing cupboard I have a Potterton EP2000 programmer and a
control box.

You'll need the appropriate wiring diagram for the type of installation
you have.

--
*Stable Relationships Are For Horses. *

Dave Plowman London SW
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