Air conditioner & heat pump error codes
Pick your brand to see the air conditioner and heat pump error codes we cover. Each code page explains what the code means, the likely causes, the safe steps to try (easiest first) and when to call a pro.
Choose your brand
- Carrier AC & heat pumpError codes guide
Coming soon - Trane AC & heat pumpError codes guide
Coming soon - Goodman AC & heat pumpError codes guide
Coming soon - Lennox AC & heat pumpError codes guide
Coming soon - Rheem AC & heat pumpError codes guide
Coming soon - Daikin AC & heat pumpError codes guide
Coming soon - Mitsubishi Electric AC & heat pumpError codes guide
Coming soon - LG AC & heat pumpError codes guide
Coming soon - Samsung AC & heat pumpError codes guide
Coming soon - Fujitsu AC & heat pumpError codes guide
Coming soon - MrCool AC & heat pumpError codes guide
Coming soon - Midea AC & heat pump 1 code page: P1 Live
- Gree AC & heat pumpError codes guide
Coming soon - Cooper & Hunter AC & heat pumpError codes guide
Coming soon
Before you look up a code
On central air conditioners, heat pumps and mini-splits, codes usually show on the thermostat, the indoor unit or a blinking light on the outdoor unit’s control board. Many come down to a dirty filter, a blocked condensate drain (float switch), a tripped breaker or outdoor disconnect, or an iced or blocked coil. On portable and window units, a full water tank or a blocked exhaust hose is common. Refrigerant, compressor and capacitor problems need a licensed HVAC technician. Write down the exact code and your model number first — codes can differ between model families of the same brand.
Always unplug the appliance before removing filters or panels. Never bypass a door lock or safety switch. If you smell gas, burning, or see sparks, stop and call a professional.
Central AC, heat pump or mini-split: turn the system off at the thermostat, then switch off the power at the outdoor disconnect and the breaker before you touch anything. Refrigerant work and the high-voltage capacitor (it can hold a dangerous charge even with the power off) are for a licensed HVAC technician only.
Looking for something else? See washers error codes, dryers error codes, dishwashers error codes, refrigerators error codes, ovens & ranges error codes, microwaves error codes, water heaters error codes.