Air Conditioner / Heat Pump Error Codes: All Brands
Air conditioner and heat pump codes, shown on the indoor unit or the remote, often concern communication between indoor and outdoor units, temperature sensors, fan motors, high or low refrigerant pressure or a condensate drain problem. Safe first checks are cleaning the air filters, clearing leaves and debris from around the outdoor unit and checking the breaker. Work on the refrigerant circuit requires an EPA Section 608 certified technician.
34Codes
3.1Average severity
24%High or critical
59%DIY-friendly
Severity distribution
ENERGY STAR certified models
| Frigidaire · Air Conditioner / Heat Pump | 27 | |
|---|---|---|
| GE Appliances · Air Conditioner / Heat Pump | 14 | |
| LG · Air Conditioner / Heat Pump | 12 | |
| Whirlpool · Air Conditioner / Heat Pump | 6 |
Source: ENERGY STAR open data (data.energystar.gov) – number of certified models currently listed.
Official safety recalls (US CPSC)
- Daikin Comfort Technologies Manufacturing Recalls Amana Through-The-Wall Air Conditioners and Heat Pumps Due to Risk of Serious Injury from Fire · The snubber circuit can emit flames if it shorts, posing a risk of serious injury due to fire hazard.
- Daikin Comfort Technologies Manufacturing Recalls Amana Air Conditioners and Heat Pumps Due to Risk of Serious Injury from Fire and Burns · The heating element can remain energized during a ground fault, despite being turned off, posing a risk of fire or burn injury to consumers.
- Daikin Comfort Technologies Manufacturing Recalls Daikin FIT, Amana Brand S-series, and Goodman SD Heat Pumps Due to Risk of Excessive Heat Exposure · A power interruption in the heat pump can result in the product providing heat when the power resumes, despite the thermostat being in cooling mode, posing a risk of excessive heat exposure to consume
- Daikin Comfort Technologies Manufacturing Recalls Amana, Daikin, Goodman-Branded Air Conditioning and Heat Pump Packaged Units Due to Fire Hazard · The unit's serial plate can have incorrect electrical ratings which can lead to incorrect wirings being used, posing a fire hazard.
- Daikin Comfort Technologies Recalls Amana Packaged Terminal Air Conditioners and Heat Pumps Due to Burn and Fire Hazards (Recall Alert) · The DigiAir module compressor can overheat, posing burn and fire hazards.
- LG Electronics Recalls Portable Air Conditioners Due to Fire Hazard · The portable air conditioners can overheat, posing a risk of fire.
- Gree Reannounces Dehumidifier Recall Following 450 Fires and $19 Million in Property Damage; Brand Names Include Frigidaire, Soleus Air, Kenmore and Others · The dehumidifiers can overheat, smoke and catch fire, posing serious fire and burn hazards to consumers.
- GE Recalls Air Conditioning and Heating Units Due to Risk of Fire · Moisture from outdoor air can accumulate near the unit's heater when the unit is operated with the vent door continuously open. This, along with two shorted electrical components, can create an electr
Source: US Consumer Product Safety Commission recalls API. Check your model and serial number on the linked recall notice.
Most viewed
U4
Daikin · Air Conditioner / Heat Pump
The indoor unit has lost its data link with the outdoor unit, so the system can't cool or heat.
Moderate
E6
Mitsubishi Electric · Air Conditioner / Heat Pump
The indoor unit isn't getting valid signals back from the outdoor unit over the S3 wire.
Moderate
13
Carrier · Air Conditioner / Heat Pump
A limit or rollout switch stayed open too long, so the furnace has locked itself out for 3…
High
31
Carrier · Air Conditioner / Heat Pump
The inducer couldn't prove a clear vent, so the pressure switch stayed open and the burners…
Moderate
33
Carrier · Air Conditioner / Heat Pump
A high-temperature safety switch opened, usually because too little air is moving through…
Moderate
A1
Daikin · Air Conditioner / Heat Pump
The indoor unit's circuit board couldn't load or apply its settings, so the head refuses to run.
Moderate
All codes (34)
P8
Mitsubishi Electric · Air Conditioner / Heat Pump
The indoor coil isn't getting colder (or warmer) than the room after the compressor starts, so…
Moderate
U0
Daikin · Air Conditioner / Heat Pump
The outdoor unit has judged the system to be low on refrigerant and stopped the compressor…
High
U4
Daikin · Air Conditioner / Heat Pump
The indoor unit has lost its data link with the outdoor unit, so the system can't cool or heat.
Moderate
U6
Mitsubishi Electric · Air Conditioner / Heat Pump
The outdoor inverter saw too much compressor current and shut down to protect the power module.
High
Brands
Daikin Air Conditioner / Heat Pump 6Mitsubishi Electric Air Conditioner / Heat Pump 5LG Air Conditioner / Heat Pump 4Carrier Air Conditioner / Heat Pump 3Gree Air Conditioner / Heat Pump 3Fujitsu Air Conditioner / Heat Pump 2Goodman Air Conditioner / Heat Pump 2MRCOOL Air Conditioner / Heat Pump 2Midea Air Conditioner / Heat Pump 2Samsung Air Conditioner / Heat Pump 2Lennox Air Conditioner / Heat Pump 1Panasonic Air Conditioner / Heat Pump 1Trane Air Conditioner / Heat Pump 1