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Trane error code 91

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Trane error code 91

Trane error code 91 indicates a communication error between the indoor and outdoor units of a Trane air conditioning system. This error code can occur for various reasons, such as faulty wiring, a malfunctioning control board, or a damaged sensor. When this error code appears, it is important to address the issue promptly to prevent further damage to your HVAC system.
 
To troubleshoot this error code, check the wiring connections between the indoor and outdoor units. Ensure that all wires are properly connected and that there are no loose or damaged wires. If the wiring is intact, check the control board for any signs of damage or malfunction. If the control board is the culprit, it may need to be replaced.
 
If you cannot resolve the issue independently, it is best to contact a professional HVAC technician for assistance. They will be able to diagnose the problem and provide the necessary repairs to get your Trane air conditioning system back up and running smoothly.