Hi, thanks for the quick reply, wall thermostat hasn"t worked since last summer would you believe? Builder sent someone to fix it at the time but broke again.I"m actually getting a few bits of electrical work done in a week or so and that was 1 of the jobs he was going to sort so we could regulate the temp! We aren"t the only ones having issues with the system, half the estate have had problems. Was actually considering getting new boiler installed because of all the hassle.