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Power On/Off Indicator

Power Status — Unit is powered on or off

Rheem · Tankless Water Heaters

What does Power On/Off Indicator mean?

The 'Power On/Off Indicator' light shows the electrical status of the water heater. It will be lit when the unit has power and off when there is no power.

Common Causes

  • Main power switch is on or off.
  • Circuit breaker is tripped or reset.
  • Power supply cord is unplugged or connected.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check if the power switch on the unit is in the ON position.

  2. 2

    Verify the circuit breaker for the water heater is in the ON position.

  3. 3

    Ensure the power supply cord is securely plugged in.

  4. 4

    Check for voltage at the unit if power is suspected.

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
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