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Do not use 3-prong to 2-prong adapters

Warning: Do not use 3-prong to 2-prong adapters

Rheem · Tankless Water Heaters

What does Do not use 3-prong to 2-prong adapters mean?

Using adapters to connect the 3-prong power cord to a 2-prong outlet is unsafe and not permitted. The water heater requires a proper ground connection, which these adapters bypass.

Common Causes

  • Using incompatible adapters for the power cord

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the outlet matches the water heater's 3-prong plug.

  2. 2

    Do not use any type of adapter between the plug and the outlet.

  3. 3

    If the outlet is not compatible, have a qualified electrician install a new grounded outlet.

Browse all codes in this manual (24)
Verified technical data. Last updated: April 2026

Related Faults

88Error 88 — Maintenance required before clearing codeAlarm/Error IndicatorSystem Alert — An issue has been detectedDANGER: Shock HazardDANGER: Shock Hazard — Electrical power is present
Source: Rheem Tankless Water Heaters
Open Manual (Page 47)Search more codes in this manual