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Mitsubishi ElectricZuba Central ducted heat pump

Code P6 · Central ducted heat pump air handler · medium

Mid-July, and a family's ducted heat pump keeps quitting in the afternoon. The wired controller shows P6, the vents go from weak to nothing, and an hour after shutting it off everything seems fine again — until the next afternoon.

Based on

Mitsubishi Electric error-code database — P6 (freezing/overheating safeguard operation)Mitsubishi Electric Zuba Central installation manual (Rev. D)