Error Code EF on your Rheem Heat Pump (551180) indicates a critical internal fault that prevents the heat pump from operating, causing it to stop and revert fully to the electric backup heating system.
Immediately turn off power at the isolation switch and close all hot water taps. Given the severity of this internal fault, professional attention is required to prevent further issues. Contact Hilton Plumbing as soon as possible to arrange safe and professional repairs.
Book online or call us directly at 1300 872 343.
