Panasonic CU-E18CKR Service Manual page 41

ii. Electrical part temperature rise protection control
- To prevent electrical component temperature rise during cooling
overload.
- Judgement condition is by outdoor temperature (sampled every
10s).
- Control contents:
Outdoor fan speed (switch to zone A and B minimum fan speed).
Outdoor total current (zone C) higher than the specified.
- Cancellation condition: When one of above is not satisfied.