My gas heater for the whole house does not follow the thermostat settings on some mornings. I have set it to 70 degrees at 6 am but now it is still 60 at 8 am. This happens weekly once or so and seems to be in the mornings only. Other timer settings seem to work fine.
I have already changed the thermostat to eliminate that possibility. I am just looking for some possible pointers before calling someone to take a look at this.
Is it possible that the pilot light/ignition does not trigger sometimes? If so, is that an easy fix?