E18
Dimplex
External Safety Interlock Open (e.g., Overheat, Low Water Cut-off)
Boiler displays E18; no heating; external controls appear normal
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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 on Dimplex safety interlock terminals, Tripped external low water cut-off device, Faulty wiring to external safety devices, Incorrectly wired external controls
How to Fix / Troubleshooting
Safety first: Do not bypass any safety devices. They are critical for safe operation.
User checks:
- External devices: If your system has an external safety thermostat or low water cut-off with a visible reset, follow the manufacturer’s instructions to reset it once only.
- Visual inspection: Look for any obvious damage to external wiring or devices connected to the Dimplex boiler safety terminals.
Professional actions:
- Test continuity of all external safety circuits connected to the Dimplex boiler.
- Correct any wiring errors and replace faulty external safety devices.
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Repair Difficulty
Hard
4/5
Required Part
External low water cut-off / safety interlock
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