Atlantic Off-Peak Control / External Signal Wiring Issue

Atlantic water heater does not start heating during off-peak hours as expected.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Incorrect connection of off-peak contact, faulty external time switch, misconfigured control mode, broken control wire

How to Fix / Troubleshooting

Safety: Only qualified persons should modify off-peak wiring. Turn off power at the main panel.

  • Check the configuration on the Atlantic control panel; ensure the heater is set to accept off-peak control if applicable.
  • Inspect the wiring from the utility off-peak relay or time switch to the heater's control terminals (often labeled C1/C2 or similar).
  • Bypass the off-peak contact temporarily (bridge the control terminals) to see if the heater starts; if it does, the external control device is faulty.
  • Repair or replace the external time switch or contactor as needed, ensuring correct wiring according to the Atlantic installation diagram.
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Repair Difficulty

Medium 3/5

Required Part

Off-Peak Control Wiring
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