Error Code 05 indicates an “Imperfect Combustion Alarm,” meaning your Rheem Continuous Flow Water Heater is detecting inefficient or incomplete combustion. This could be due to blockages, incorrect gas supply, or burner malfunction.
Immediately turn off the power supply at the isolation switch and ensure the gas supply is shut off. Do not attempt further operation, as improper combustion poses safety risks. Due to potential gas and combustion issues, contact Hilton Plumbing urgently to safely inspect and rectify the fault.
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