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Warning: Do not install above 2000 ft. without proper adjustments

Warning: Altitude adjustments needed above 2000 ft.

Rheem · Tankless Water Heaters

What does Warning: Do not install above 2000 ft. without proper adjustments mean?

Installing this water heater at elevations above 2,000 feet (610 meters) requires specific adjustments. Operating without these changes can lead to improper function. Contact an expert for assistance.

Common Causes

  • Installation at high altitude without required adjustments
  • Altitude derating not applied

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Determine the installation altitude.

  2. 2

    If above 2000 ft (610 m), contact a qualified service technician or your installer.

  3. 3

    Ensure proper altitude adjustments are made according to the manual.

  4. 4

    Refer to the 'Vent Length and High-Altitude DIP Switch Adjustments' section for details.

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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
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