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Return water temperature sensor sees temperature higher than 200°F.
1. Is correct harness connected to return sensor (2 Brown Wires)?
Yes: -> 2
No: Correct wiring
2. Unplug molex connector on return sensor. Is there moisture or liquid on metal pins? Liquid might be water or antifreeze solution.
Yes: Remove all liquid from connector. Check for leaks. Repair all leaks.
No: -> 3
3. Is Primary Pump properly oriented?
Yes: -> 4
No: Install Primary Pump in proper orientation.
4. 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
