Bridging old wired thermostat causes a short circuit

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Installing the V3+ Wireless Receiver and Thermostat.

A suggestion from elsewhere suggested that I leave the existing wired thermostat in place but leave it on full, hence allowing the new setup to control the boiler. However this blows a fuse.

So, I followed the instructions bridging the old thermostat but this also blows a fuse - I guess because it does the same thing as turning the thermostat to max.

Am i doing something wrong, or are the instructions incorrect/inadequate?

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