Hi, my radiators have always been too hot to touch. I can turn the thermostat down but it makes no difference. The boiler is a Glowworm Compact 75p, with a Horstmann Centaur Plus C17 timer unit. The boiler does not have an inbuilt thermostat, instead there's a Sunvic (Honeywell style) in the hall. I've been told it could be the circuit board. Any ideas, anyone, please? I've asked two heating firms to come and have a look but they've not bothered turned up.