Set Appliance State:

WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Is the appliance being affected by a strong interference (EMC) field, see note.
Note.
An EMC problem (or Electromagnetic compatibility problem) occurs when one piece of electronic equipment or an electromagnetic system is adversely affected the operation of another. One example might be breakthrough by the high field strengths produced by a nearby radio transmitter.