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1. On units with cast burners, the sensor is located near
the igniter mounted on the same metal bracket as the
igniter. Units with a burner plate have the sensor
mounted on a small support bracket.
2. Use the proper nut driver or screwdriver to remove the
sensor’s mounting nut or screw (depending on model).
3. Disconnect the sensor from the supply wiring.
4. Replace with new sensor. For units with cast burner,
the sensor tip must be properly positioned within the
burner flame. Normally 1/2 in. is sufficient. On units
with a burner plate, the sensor is pre-formed and will
be self-located when remounted back onto the
support bracket. The clearance of the sensor rod to
burner plate on the burner flame side of the plate
must be 1/8 in.
Replacement of Sensor
Screw
Servicing
Instructions
August 1999
8.7-1
1