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Return water temperature sensor is open. No continuity.
1. Is harness plugged into return temperature sensor? Is harness plugged into control module J5?
Yes: -> 2
No: Insert harness
2. Check continuity of brown wires between return temperature sensor and control module J5-4 and J5-12 continuity?
Yes: -> 3
No: Replace wires
3. Measure return temperature sensor resistance with digital meter. Estimate sensor temperature. Does temperature fall within ranges?
Yes: Replace control module.
No: Replace return temperature sensor.
