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NOTICE: Do not connect power until venting installation is complete

NOTICE: Wait for venting to be installed before connecting power

Rheem · Tankless Water Heaters

What does NOTICE: Do not connect power until venting installation is complete mean?

Power should not be connected to the water heater until the venting system has been fully installed. This ensures the unit operates safely and correctly from the start.

Common Causes

  • Power connected before venting is installed

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the venting installation is fully complete.

  2. 2

    Verify all venting connections are secure and properly routed.

  3. 3

    Only then, connect the electrical power supply.

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