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Firstly thanks to those who answered my question ref the thermostat. Throughout the day we get an awful noise from the pipes in our airing cupboard. There is loud knocking followed by gurgling noises in the pipe to the expansion tank in the loft while hot water is being shot into the tank at...

I am trying to wire in a replacement thermostat,the old one was wired as follows; Red to 1 Yellow to 3 Blue to 4 My new thermostats wiring diagram is slightly different showing four terminals being used (I think)? Any help would be appreciated

An extra terminal is used but I don't have the extra wire

Red to 1<br>Yellow to 3<br>Blue to 4

Wiring