E16
Atlantic
Room Thermostat / External Control Fault
Boiler shows E16, often related to external control issues; heating may not start even though the boiler appears powered.
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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
Open circuit in room thermostat wiring, Faulty external control (e.g., Atlantic room unit), Incorrect control settings, PCB input fault
How to Fix / Troubleshooting
Safety: Turn off power before accessing control wiring terminals.
- Check thermostat settings: Ensure the room thermostat or programmer is calling for heat and not in OFF or holiday mode.
- Inspect wiring: At the boiler's low-voltage control terminals, check that the thermostat wires are secure and not broken.
- Bypass test (qualified persons only): Temporarily link the room thermostat terminals at the boiler to simulate a call for heat. If the boiler starts, the external control is faulty and should be replaced.
- Professional help: If wiring and controls appear correct, a technician should test the PCB input circuits.
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Repair Difficulty
Medium
3/5
Required Part
Room Thermostat / Room Control Unit
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