Air conditioner error codes: meaning and checks from the service manuals

Look up an air conditioner error code

Choose the brand, type the code the unit shows: its meaning and the checks from the brand's service manual. Free, no account needed.

2What does the unit show?

A codeLetters and digits, e.g. U4, H11, E6Blinking lampNo digits, only a lamp blinksA symptomNot cooling, leaking, stops…

The code on the display or the remote

Looked up most (Panasonic):

Which lamp blinks on the indoor unit?

RUN / OPERATIONTIMERBothAnother lamp

How many blinks before a pause?

Count from the first blink to the pause; count twice to be sure.

What is wrong? Tap the closest ones

Not listed? Describe it in your own words

No time to type? Use the microphone of the keyboard.

Know the model? Type it for a closer answer (optional)

Model (on the label of the indoor or outdoor unit)

Guides for beginners

10 questions a day, and step-by-step questions on the service manuals.