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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 shown on chart?
Yes: Replace control module
No: Replace retun temperature sensor
