Hi

I'm not an engineer and I know nothing about boilers!  My Camray 5 external boiler has a frost stat so it fires at 5c for 5mins or so, but recently the boiler has started firing automatically for long periods.  The air temp outside is showing -10c so is my boiler just working really hard to protect itself? Last night it fired on and off for about an hour or more each time all night.

Thanks for replying; didn't realise I had a response until I logged on today!

Anyway, the boiler has it's frost stat inside the control panel but the boiler is lagged so should the frost stat be behind the lagging? This means we have to burn oil to heat the whole of the inside of the boiler casing to get the frost stat to warm up inside the control panel; if it's -12 outside this would burn up a whole lot of oil. Surely the boiler parts beneath the lagging are the parts that should not be allowed to freeze whereas the current configuration relies on the boiler leaking heat through the lagging to eventually warm up the forst stat; doesn't seem to be a very efficient way of doing things.  And it keeps us awake all night!