4 wires in room stat

Joined
24 Sep 2008
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Location
Warwickshire
Country
United Kingdom
I have used this site before an thanks to all who helped, but now my mums heating was playing up. She has a none combi boiler on a danfoss mech timer, i change the pump but it was the room stat that keps blowing the 3amp fuses. so i bourght a danfoss RMT230. The problem is the ol stat has 4 wires but the instructions on the new one only is showing 3.
The ol on has a red, green, yellow & blue. All i no is that the yellow goees to the pump an the red is live? can anyone help.
 
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