I have a furnace for heating my home. On two occasions in same week it failed to switch on. I had to restart the furnace with
reset button. The system should go on automatically when temperature dips below -10 degress. What could be the problem.
Could be a bad flame sensor, sticky solenoid on your gas valve to name a couple, if you have gas.
Could be a bad primary control if you have oil.
It could be so many things, a simple loose stat wire could cause it, call a Tech so nothing else gets screwed up and you don't blow your house and the neighborhood up (if you have gas)
I agree with sten, plus:
I think that your gas valve (thermostat) is malfunctioning, assuming you have a gas furnace. When the thermostat calls for gas to get the burner going, the valve won't open.
Get a plumbing and heating guy to fix it. Don't wait.
What kind of a furnace/boiler do you have??? Is it gas-fired, oil-fired, electric, etc.???
If it's gas-fired then I agree that you should not attempt a repair & get a service tech to fix it.
If it's oil-fired please post back with the burner make & model/ furnace/boiler mfgr./ & if the reset switch is on the flue stack or attached to the oil burner
Is it a boiler??? A boiler heats up hot water & circulates it thru the house into radiators or baseboard.
Is it a furnace???? A furnace heats up fan-driven air in the furnace that is circulated thru the house by ducts.