Error Code P05 on your Rheem Heat Pump (551270 in R134a) indicates a problem within the heat pump’s internal controls, sensors, or refrigerant circulation, potentially stopping normal operation or reducing heating efficiency.
Immediately switch off the electrical supply at the isolation switch, and close any open hot water taps. Because Error P05 relates to internal heat pump components, specialist diagnostic equipment and knowledge are needed. Contact Hilton Plumbing promptly for professional inspection and repair.
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