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Atlantic
Water Heater
Data independently verified by Elite B2B Technicians
Diagnostic Complet

Error Code Er 21 Atlantic

Symptom / Description

Heater stops working, dry fire protection

Root Cause

The system detected that the heating element was energized without being submerged in water.

Repair Instructions

UNLOCKED

Ensure the tank is full of water before turning on the power. Reset the unit. Check for leaks that may have drained the tank.

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