central heating

[shamon]

Why is my central heating permanently on even when set to 'off' or 'timer?!!.The only way to switch it off is to set the boiler to 'reset'.

[stanleyman]

Need more info, type of boiler, system, what reset etc.

[les saisies]

Have you got a frost-stat in the loft?

If you have it may be set wrong and is bringing on the system at too high a temperature.

The idea is to switch on the system, overriding the room stat, to prevent the pipes in the loft freezing up at times when the heating is otherwise shut down.

[KARL]

A stuck zone valve actuator is a possible reason - hasn't returned to the off position (usually a mechanical process) and therefore the boiler circuit is still energised. Try finding a manual override lever on the zone valve and move it to the "off" or "closed" position.