Heat Pumps Error Codes & Fault Troubleshooting
Model-specific heat pump and mini-split error codes, with the safe checks a homeowner can perform.
Popular manufacturers
Browse all manufacturersCommon Heat Pumps codes
The most used codes on this device family, grouped by brand.
Daikin
All Daikin codesA5Moderate
Daikin
Meaning pending official confirmation
September 2026View
E7Moderate
Daikin
Meaning pending official confirmation
September 2026View
Flashing operation lampModerate
Daikin
Potential malfunction detected
September 2026View
U0Moderate
Daikin
Meaning pending official confirmation
September 2026View
U2Moderate
Daikin
Meaning pending official confirmation
September 2026View
U4Moderate
Daikin
Meaning pending official confirmation
September 2026View
U5Moderate
Daikin
Connection error during system setup
September 2026View
Fujitsu
All Fujitsu codesCommon problems
Start from the symptom when you do not have a code yet.