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Return Temp.
1. Is correct harness connected to return sensor (2 Brown Wires)?
Yes: -> 2
No: Correct wiring.
2. Is Heat Exchanger Pump oriented properly? (Pump Arrow pointing down?)
Yes: -> 3
No: Install heat exchanger pump in proper orientation.
3. Disconnect harness from Return Water Sensor. Measure resistance using digital ohm meter. Is resistance between 950 to 33,000 ohms?
Yes: Replace Control Module.
No: Replace Return Water Sensor.
