i have fitted a heatmiser prt-ts today to replace a 16 year old honeywell thermostat. It is being used on a combi-boiler.
I wired the red wire to L, blue to N, yellow to A2 and bridged A1 to L as per the installation instructions.
However when i switched the power back on the heatmiser shows no signs of life.
I was wondering if anyone has encountered the same problem and whether I have to do something to switch it on? The old thermostat was working fine, but I did have a new boiler fitted 3 years ago and I am now wondering whether the wiring may have been mixed up then?