Atlantic water heater's indicator light is off and unit appears completely dead.

Safety: Use a multimeter only if you are competent to work on live circuits. Otherwise, call a qualified electrician.

• Check the dedicated circuit breaker or fuse in the electrical panel and reset/replace if tripped or blown. Investigate why it tripped.
• Verify voltage at the heater's terminal block; if none, inspect the supply cable and junction box.
• If voltage is present at the terminal block but the heater is dead, check for an internal fuse on the Atlantic control board and replace with the same rating if blown.
• Test the main on/off switch (if fitted) for continuity; replace if faulty.