E12
Atlantic
Control PCB Communication / Internal Error
Boiler shows E12, will not start; may be intermittent, often after power cuts or surges.
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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
Faulty main control PCB, Loose internal connectors, Electrical interference or surge damage, Faulty display/keyboard PCB
How to Fix / Troubleshooting
Safety: Isolate the boiler from the mains before touching internal electronics.
- Power cycle: Turn off the boiler at the main switch or breaker for 2–3 minutes, then restore power and see if E12 clears.
- Check supply voltage: Ensure the boiler is supplied with stable voltage within the range specified by Atlantic. Avoid using undersized extension leads or shared circuits with heavy loads.
- Inspect connectors: With power off, a technician can reseat ribbon cables and multi-pin connectors between the main PCB and display board.
- Professional repair: Persistent E12 usually requires PCB diagnosis and replacement by an authorized service center.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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