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Trane 5DCZ5024A1 troubleshooting and error codes

Use this table to identify what the visible code may mean and what information to share when scheduling service. Keep checks simple and visible; do not open electrical, refrigerant, gas, or sealed equipment compartments.

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Error-code table

Search codes for 5DCZ5024A1

Code Meaning System area Safe first step Action
MCB 2 Flash Active sensor communication error Refrigerant mitigation control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
MCB 3 Flash Active refrigerant leak or sensor-failure alarm Refrigerant mitigation control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
MCB 4 Flash Past refrigerant detected alarm Refrigerant mitigation control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
MCB 5 Flash Past sensor communication error Refrigerant mitigation control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
MCB 6 Flash Past sensor error Refrigerant mitigation control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
MCB 7 Flash Past sensor communication or sensor error Refrigerant mitigation control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
IGN Steady Off Check power or failed board Ignition board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
IGN 2 Flashes System lockout: failed to detect or sustain flame Ignition and flame sensing Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
IGN 3 Flashes Pressure switch problem detected Pressure switch circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
IGN 4 Flashes High limit switch protection device open High limit safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
IGN 5 Flashes Flame sensed without the gas valve energized Ignition and gas-valve control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
IGN 6 Flashes Flame rollout switch open Flame rollout safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
IGN 7 Flashes Thermostat W1/W2 wiring issue Thermostat and low-voltage wiring Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details

Safety note

What is safe to check before service

These pages are meant to help document the issue, not replace diagnosis. GreenFlow should handle pressure-switch, electrical, refrigerant, lockout, recurring, and warranty-related conditions.

Safe visible checks

  • Thermostat display and settings
  • Filter condition and return-air path
  • Visible outdoor-unit obstruction
  • Photos of the code, unit, and nameplate

Stop and call

  • Repeated lockouts or recurring faults
  • Pressure-switch or sensor faults
  • Electrical odor, unusual noise, or ice buildup
  • Any sealed cabinet, refrigerant, gas, or warranty issue

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John F.

I needed 2 new AC units and decided to go with high efficiency heat pumps. I chose Greenflow because of the equipment they offered, and the price (2nd lowest quote and much cheaper than the average of all quote we received). Their technicians were very detail oriented and...

Jack B.

Andrey always does a great job.

Jahangir R.

They were very organized to communicate and be on time to come to look at my air condition to fix it.

Ray

Just had a service call because my tankless water heater stopped working with E110 code. Andrey located the root cause real quick and fixed the issue within half an hour, also gave reasonable recommendations for further maintenance.

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