I have recently replaced an old Honeywell 3 wire thermostat with a SunvicTLX4101. Having looked at other postings I haven't connected a neutral cable. Everything appears to work okay however the pump is running all the time even when the heating/hot water is off. Any ideas?
Gravity feed, boiler is quite old, but regularly serviced Ideal Mexico. Timer is a British Gas UP2, (I believe this is a Drayton Lifestyle Dual Channel) which was installed about 2 years ago. Pump is a Superflow 500 plus set at speed2.
When I first replaced the stat and got the wiring wrong, I did blow a fuse a couple of times?