Can anyone help me - I would like to replcae a 15 year old Potterton
thermostat in my house. When I opened the thermostat up I found 3
L, N and a mysterious 'H'. These go to terminals labelled TP1, TP2 and
The thing is the new thermomstat I purchased (Danfoss RMT-230) has 4
terminals but the instructions only shows how to wire the L and N. What
do I do with the 'H' wire and what is this mystery wire for??
Any help would be most appreciated!