Not so easy to install thermostat
I have tried to replace a thremostat in my hallway. Easy I thought. Old one (Honeywell T6060B, manual dial type) has three wires (live, neutral, therm). The new stat (Danfoss TP5, digital readout type) also has the same three wires. The wiring diagram is easy to understand and the job should be simple, replace the wires like for like as per the diagram.
How wrong could I be. The fuse in the wall near the boiler keeps blowing every time the thermostat tries to engage and switch on the heating system! I have gone through 13 - 3amp fuses and just can't figure it out! I have followed the wiring diagram to a tee. COM(1) = Live/Red, OFF(2) = Neutral and ON(3) = Therm.
Can anyone help me please. Open to all suggestions apart from call a plumber or electrician, which is my next step.