Bryant communicating system displays code 44; outdoor unit does not respond to thermostat commands or shows intermittent communication loss.

Safety first: Turn off power to indoor and outdoor units. Communication wiring is low-voltage but can still short and damage boards.

Steps:

• 1. Verify ABCD wiring: At the indoor unit and outdoor unit, confirm that the ABCD terminals are wired color-for-color and in the same order (A to A, B to B, etc.). Correct any miswiring.
• 2. Inspect cable: Follow the communication cable between units. Look for staples through the cable, rodent damage, or splices exposed to moisture. Repair or replace damaged sections.
• 3. Tighten connections: Loosen and re-tighten all ABCD terminal screws to ensure solid contact. Do not overtighten and break the conductor.
• 4. Power cycle: After correcting wiring, restore power and allow the system a few minutes to re-establish communication. Clear codes from the thermostat if needed.
• 5. If code 44 persists: The outdoor control board or indoor control may be defective. This requires diagnostic tools and replacement by a Bryant-authorized technician.

Note: Use only approved thermostat/communication cable (twisted pair recommended) for long runs to reduce noise and interference.