Fault Codes / Airwell / P9

AI

Airwell P9

High

YHD — Indoor coil freeze protection.

Airwell P9: Indoor coil freeze protection. This fault noticeably affects operation.

Possible causes

Cooling: low airflow / low refrigerant.

Check steps

Clean filter & coil, check charge.

Affected parts

Luftfilter
Wärmetauscher

Safety note

Follow F-Gas.

Source: Airwell YHD/HZ Service Manual

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.

Look up in Enthalio →

Related fault codes

Communication error.E6 High pressure protection (outdoor).P0 Low pressure protection.P1 Compressor overcurrent.P2 IPM protection / inverter fault.P4 Compressor startup failure.P6