Over the past couple of weeks our gas furnace will stop working. It usually stops in the middle of the night and we wake up to find the temperature in the house 7 to 10 degrees below the set temperature on the electronic thermostat.
The furnace does not kick on if you increase the temperature settng on the thermostat. However, it does come on, usually, if I turn the thermostat setting from "Heat" to "off" for a few minutes, then back to "Heat". I have not tried restart the furnace by turning off the main power switch to the furnace.
Can anyone suggest what the problem might be, and how much it might cost to get it repaired?
thanks, Jim Myers