On Jan 22, 5:07*am, "
wrote:
Boiler does start as per times set (Twice: once in morning and once in
evening, two hours each time). Water tank gives hot water. But all
radiators in the house are cold.

This began after holes were drilled right above Thermostat that
dropped lots of fine dust on Thermostat and surely quite some got in.

Previously when turned Thermostat was giving 'kt' sound when room
temperature was crossed. No such sound any more.

Regards,
BarJor

Hi,

I guess this is more likely if your themostat is one of those more
mechanical ones, without the LCD etc. I would see if a gentle cleaning
with a vaccum cleaner would fix it. Otherwise try a new thermostat.
You can buy them at home depot.

Best, Mike.