I recently bought a house which has a old kestron boiler. attached to this boiler is a 4 channel hortsmann programmer which control 3 zones and one water zone. Dotted around the house are three thermostats which control different areas of the house. the problem i am currently facing is that the boiler stays on all the time and is always warm even when the thermostats have been turned down to 5 degrees. the programs on the thermostat are sent to come on at certain times but i find the boiler stays on 24 hours a day and when i go the boiler cupboard, it is always hot yet the radiators are cold.