That could be because the temperature around the thermostat.
Gas wall heater thermostat not working.
Each time the heater works for a week or three.
My gas wall heater vented will not heat the pilot has stayed lit for the past few hours but burner won t go on.
Choose the red and white wires if you are having problems with.
Registers closed or blocked.
Reset the breaker or replace the blown fuse if necessary.
If it does not turn the furnace and air conditioner power back off again at the breaker panel.
Thermostat set too low.
The heater has stopped working.
I have changed the thermastat 3 times.
Clean or replace filter.
Not enough heat.
The pilot lite is lit.
Thermostat does not control temperature 1 turn the power off to the heating system.
2 remove the thermostat s cover.
With most types you just pull it straight out but check your manufacturer s.
Make sure they are not blocked by tugs drapes or furniture.
If the problem isn t with the breaker box examine the unit s wiring for loose connections.
If your heater s not working at all check for a tripped breaker or blown fuse.
That said if there is a physical click in the thermostat sounds like it is functioning at least mechanically.
I woke up this am to no heat and no pilot got pilot lit before work but when i got h read more.
I changed the thermastat and the heater worked for a week or two.
On the furnace side it could be a bad main gas valve solenoid which would still allow the pilot light to function but not enable the main valve.
Raise thermostat setting 5.
Study the wires inside the thermostat.
Make sure gas valve to furnace is fully open.
Make sure all registers are open.
3 use a soft brush or vacuum with a brush attachment to gently and carefully remove dust and dirt.