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
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
Can anyone suggest what the problem might be, and how much it might cost to
get it repaired?
I had this happen a few years back when I didn't know anything about this
stuff... the repair man came out and cleaned the flame sensor with a small
wire brush... I've since then had the same problem, with the same fix only
this time I fixed it myself.
I've heard of several other people with the exact same problem, and this is
the usual fix.
give this a shot before calling in the pros
It could be a cranky thermostat. It might be a bad relay. It might be a worn
out HSI. Could be a bad flame rectification sensor. Might be a bad circuit
board. Could be a bad fan limit switch. Could be an intermittent gas valve.
Might be a loose wire rubbing on a ground.
I'd be tempted to call a heating guy and get the thing overhauled.
Intermittent furnaces are like tooth aches, they don't get better on their
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