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Flue temperature sensor is open. No continuity.
1. Is harness plugged into vent temperature sensor? Is harness plugged into control module J5?
Yes: -> 2
No: Insert harness
2. Disconnect harness from vent temperature sensor and control module J5. Continuity for each blue wire?
Yes: -> 3
No: Replace wires
3. Measure resistance across vent temperature sensor terminal. Does resiatance match estimated flue temperature?
Yes: Replace control module.
No: Replace vent temperature sensor.
