Error Code P04 on your Rheem Heat Pump (551270 in R134a) indicates an internal control fault or sensor malfunction that is interfering with the heat pump’s normal heating operations.
Switch off the electrical power at the isolation switch immediately and ensure all hot water taps are closed. Due to the internal and electrical nature of this fault, a thorough professional inspection is required. Contact Hilton Plumbing promptly to arrange necessary repairs and safely restore hot water functionality.
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