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