H 21
Panasonic
Panasonic air conditioner error H 21
Meaning
drainage blocked or float sensor defective
General meaning for the brand's models, unless a model's own manual says otherwise.
Meaning
Indoor float switch operation abnormality
Models
CS-AU12BKH-8, CS-AU9BKH-8, CS-LU12AKH-8, CS-LU18AKH-8, CS-LU9AKH-8, CS-PU12AKH-8, CS-PU12XKH-8M, CS-PU18AKH-8, CS-PU18XKH-8M, CS-PU24XKH-8M, CS-PU9AKH-8, CS-PU9XKH-8M, CS-RU12AKH-8, CS-RU18AKH-8, CS-RU9AKH-8, CS-U12BKH-8, CS-U12XKH-8, CS-U12ZKH-8, CS-U18BKH-8, CS-U18XKH-8, CS-U18ZKH-8, CS-U24BKH-8, CS-U24XKH-8, CS-U24ZKH-8, CS-U9BKH-8, CS-U9XKH-8, CS-U9ZKH-8, CS-WPU12XKH-8, CS-WPU18XKH-8, CS-WPU24XKH-8 and 90 more
Causes and how to check
- the cited manual page, and follow-up questions
No account needed to look up codes.
Model series: CS/CU-AU, CS/CU-LU, CS/CU-PU, CS/CU-RU, CS/CU-U, CS/CU-WPU, CS/CU-XPU, CS/CU-XU, CS/CU-XZ, CS/CU-YZ
Guides
- Checking an air conditioner temperature sensor (thermistor)
How to check the room, coil or discharge sensor when the unit reports a sensor error: measure its resistance and compare with the exact model's table.