Error Code E7 indicates a failure or fault condition involving the heat pump’s internal temperature sensors, controls, or refrigerant system. When this occurs, the heat pump stops, and the electric backup heating takes over temporarily.
For your safety, immediately switch off the electrical supply at the isolation switch and turn off all hot water taps. Due to the complexity of internal sensors and electrical components involved, you must contact Hilton Plumbing to arrange professional servicing.
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