Independent heat pump guides for US homes
Straight answers for US heat pump owners
Error codes decoded brand by brand, what each repair should cost, and when to stop and call a pro. Every guide is checked against the manufacturer’s own service manual, not copied from other websites.
Popular: Mitsubishi Daikin LG Fujitsu Gree Carrier Trane Goodman Bosch MrCool All guides
- Checked against manufacturer service manuals
- Repair costs from published data, with sources
- Independent: no sponsored rankings
Find your error code by brand
Pick your brand. Each guide explains what the codes mean, what you can safely check yourself and when to call a technician.
MitsubishiP8E6U4P, E, U and F codes, straight from the service manual.See the codes
DaikinU4A5E7U0Mini split, Daikin Fit and One+ codes, with a full U4 guide.See the codes
LGCH01–CH67All 33 CH codes, from CH01 to CH67.See the codes
Fujitsu11–A5How to read the blinking lights, and all 36 codes.See the codes
GreeE1E6F0H6E, F, H, L and U codes for US wall-mounted units.See the codes
Carrier31328384Infinity, Greenspeed and ductless codes, plus the 84 lockout.See the codes
TraneFlash codesWhat each flash on the defrost board means.See the codes
Goodman02L2b9d0Control board codes, faults vs lockouts and the fault history.See the codes
BoschH5E5P1EL0CIDS outdoor units and Climate 5000 mini splits, Gen 2 to 4.See the codes
MrCoolE1ECEL-0CP3DIY, Advantage and Olympus codes, by generation.See the codes
Another brand?Search for the code on your display, or browse every troubleshooting guide.Browse all guidesOr start with what you’re seeing
- Heat pump blowing cold air in heat mode: eight causes, from normal defrost to a stuck reversing valve
- Heat pump covered in ice: normal frost vs a real ice problem, and what to do
- Heat pump keeps turning on and off: how to time a short cycle and the eight usual causes
What heat pumps really cost
Why you can trust these numbers
We read the service manual
Code meanings come from the manufacturer’s own documentation, and every guide links to it.
We show what repairs cost
Each fix comes with a typical price range, so you can judge a quote before you approve it.
We say when to call a pro
Some checks are safe for anyone. Refrigerant and high-voltage work are not, and we say so.
HeatPumpTab is written by Bruno Grediaga. How we research and check every guide →
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