Place the heater in the heat mode. The blower comes on. In 4-5 seconds the heater will light. It will stay lit for 2-5 minutes and then go out. The problem code will indicate IF or LO and the will go to the ''service mode''.
Sounds like a flame sensor.remove ignitor assembly and clean with fine emory cloth or steel wool.when properly cleaned it should feel smooth for entire length of sensor
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Heater will not light and service light is on
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