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Clean furnace temperature sensor.
Hook up your multimeter in series with the flame sensor and the sensor wire and fire the furnace in a heat cycle.
Lightly clean the surface with fine emery cloth and slip the sensor back into its bracket.
To clean a furnace start by turning off the furnace then removing the access panel on the outside of the furnace and inspecting the filter for dirt or damage every 3 4 months.
To fix this problem of the flame sensor not allowing the furnace to light we must clean the flame sensor.
You may need to replace the sensor in which case you can follow these same instructions with the exception that no sanding is involved.
Then to clean the blower assembly remove the front panel clean the.
In some furnaces this is easily done while with other gas furnaces the flame sensor is difficult to remove for cleaning.
The flame sensor occasionally becomes coated with residue and will prevent your furnace from lighting.
If you re willing to risk 120 and buy all three parts ahead of time you may be able to fix your own furnace in less than an hour and save a 125 service call.
If cleaning your flame sensor did not work it s possible that the sensor is broken and that the furnace is operating as it should.
If the filter is dirty replace it or clean it with soap and water if it s not disposable.
Remove it by pulling it down out of its bracket.
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Check the flame sensor if present.
Just remove one sensor and replace it with a new sensor.
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Your readings should be 1 5 to 4 ua some manufacturer s control systems only need 0 5 ua so check the manual for the system you re testing.