I have the same problem w/my CW-XC122VU. Other symptom is that the thermostat setting does not work in this "poltergeist" mode. After the problem went away by itself, then re-occurred, I notice it tracks the level of the water in the pan. A full pan of water will trigger poltergeist-mode, so I suspect some control or sensor is being shorted. The posted solutions ("transformer hum" or "broken on/off switch" are off the mark and generally unhelpful). We are not alone, though...the problem is observed in many Panasonic and Quasar window A/C units.
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I am also experiencing this problem for my Panasonic CW-C102VPH. looks like no problem with the freon charge because air is very cool if compressor is ON.. but room temperature is only 30 degC because of the constant turning OFF every 5 minutes. Is there a solution for this?
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