E14
Dettson
Short Cycling / Minimum Run Time Fault
Boiler shows E14 and cycles on and off rapidly without satisfying heat demand
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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
Oversized Dettson boiler, Incorrect control settings, Faulty room thermostat, Flow imbalance in system
How to Fix / Troubleshooting
Safety: Adjustments to boiler parameters should follow the Dettson installation manual. When in doubt, consult a professional.
- Check thermostat: Ensure the room thermostat is not located near a heat source or draft. Replace batteries and verify proper operation.
- Review control settings: Access the Dettson boiler control menu (per manual) and check minimum run time, differential, and outdoor reset settings. Avoid extreme values that cause rapid cycling.
- Verify flow: Make sure all intended zones are open and that balancing valves are not overly restricting flow. Air in the system can also cause erratic cycling; bleed if necessary.
- Professional assessment: If E14 persists, a heating contractor should evaluate boiler sizing, system design, and may adjust pump speeds or add a buffer tank.
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Repair Difficulty
Medium
3/5
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