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steven85Aug 12, 2025
What to do if my Carrier Air Conditioner showing overload protection?
- ZZachary HuntAug 12, 2025
If your Carrier Air Conditioner is showing an overload protection error, check the system load and reset the protection.
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If your Carrier Air Conditioner is showing an overload protection error, check the system load and reset the protection.
What to do if my Carrier Performance 40MBDQ12---3 Air Conditioner showing over voltage or over low voltage protection?
If your Carrier Air Conditioner shows an over voltage or over low voltage protection error, verify the voltage levels and circuit integrity.
What to do if my Carrier Performance 40MBDQ12---3 Air Conditioner has high temperature protection of compressor top diagnosis?
If your Carrier Air Conditioner activates high temperature protection for the compressor (9K, 12K models only), allow the compressor to cool down.
What to do if my Carrier Performance 40MBDQ12---3's indoor room temperature sensor T1 is open or short circuit?
If your Carrier Air Conditioner indicates that the indoor room temperature sensor T1 is open circuit or short circuit, check the T1 temperature sensor connection and consider replacement.
What to do if my Carrier Air Conditioner's evaporator coil temperature sensor T2 is open or short circuit?
If your Carrier Air Conditioner indicates that the evaporator coil temperature sensor T2 is open circuit or short circuit, check the T2 temperature sensor connection and consider replacement.
What to do if my Carrier Performance 40MBDQ12---3 Air Conditioner's condenser coil temperature sensor T3 is open or short circuit?
If your Carrier Air Conditioner indicates that the condenser coil temperature sensor T3 is open circuit or short circuit, check the T3 temperature sensor connection and consider replacement.
What to do if my Carrier Performance 40MBDQ12---3 Air Conditioner's outdoor ambient temperature sensor T4 is open or short circuit?
If your Carrier Air Conditioner indicates that the outdoor ambient temperature sensor T4 is open circuit or short circuit, check the T4 temperature sensor connection and consider replacement.
What to do if my Carrier Air Conditioner's compressor discharge temperature sensor T5 is open or short circuit?
If your Carrier Air Conditioner indicates that the compressor discharge temperature sensor T5 is open circuit or short circuit, check the T5 temperature sensor connection and consider replacement.
General| Brand | Carrier |
|---|---|
| Model | Performance 40MBDQ12---3 |
| Category | Air Conditioner |
| Language | English |
Warning regarding potential for personal injury or death due to electrical shock during installation or service.
Warning about explosion risk when using oxygen for leak testing or operating refrigerant compressors.
Caution about potential equipment damage or improper operation due to incorrect installation or maintenance.
Mandatory installation by authorized dealers to prevent water leakage, electrical shock, or fire.
Table listing diagnostic codes, their corresponding timer lamp flashes, display indicators, and LED status.
