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Return Sens Open.
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. Do temperature and resistance fall within ranges?
Yes: Replace Control Module.
No: Replace Return Temperature Sensor.
