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Trane 5TAMXC03AV31 troubleshooting and error codes

These codes are matched from manufacturer documentation to this model's series or control platform. Keep checks visible and safe; do not open electrical, refrigerant, gas, combustion, or sealed equipment compartments.

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Source-backed code set

15 matched codes

CodeMeaningSystem areaPriority
MCB 2 FlashActive sensor communication errorRefrigerant mitigation control boardUrgent
MCB 3 FlashActive refrigerant leak or sensor-failure alarmRefrigerant mitigation control boardUrgent
MCB 4 FlashPast refrigerant detected alarmRefrigerant mitigation control boardUrgent
MCB 5 FlashPast sensor communication errorRefrigerant mitigation control boardUrgent
MCB 6 FlashPast sensor errorRefrigerant mitigation control boardUrgent
MCB 7 FlashPast sensor communication or sensor errorRefrigerant mitigation control boardUrgent
MCB Amber Fast BlinkCAN communication lostRefrigerant mitigation control boardUrgent
Red 2 FlashEquipment missing, mismatch, or configuration issueAir handler controlUrgent
Red 3 FlashBlower issueBlower and airflowUrgent
Red 4 FlashEEV issueElectronic expansion valveUrgent
Red 5 FlashSensor issueAir handler sensorsUrgent
Red 6 FlashIndoor heat issueElectric heat configurationUrgent
Red 7 FlashExternal switchExternal switch circuitUrgent
Red 8 FlashCondensate issueCondensate safetyUrgent
Red 9 FlashFrost issueFrost protectionUrgent