E20
Dimplex
Cylinder Sensor / Cylinder Thermostat Fault
Boiler displays E20; no heating; the cylinder icon may flash on system/heat-only models.
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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
Failed Dimplex cylinder NTC sensor, a faulty wired cylinder thermostat connected to the Dimplex boiler, a loose sensor pocket, or poor contact with the cylinder.
How to Fix / Troubleshooting
Safety first: Isolate power before accessing cylinder wiring or sensors. Hot water cylinders can be very hot.
User checks:
- Cylinder stat setting: Ensure the mechanical cylinder thermostat (if fitted) is set to an appropriate temperature (typically 60°C).
- Reset: After adjusting, reset the Dimplex boiler and check if E20 clears.
Professional repair:
- Test and replace the Dimplex cylinder NTC sensor or thermostat.
- Ensure the sensor is fully inserted into the cylinder pocket with good thermal contact.
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Repair Difficulty
Medium
3/5
Required Part
Dimplex cylinder NTC sensor / thermostat
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