E11
Immergas Floor Sensor Failure

Thermostat shows E11 and cannot detect the floor temperature sensor in underfloor heating mode

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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 or shorted Immergas floor NTC sensor, Sensor cable damaged in screed or conduit, Incorrect sensor terminals used, Loose terminal screws at thermostat

How to Fix / Troubleshooting

Safety: Turn off power to the thermostat before working on sensor wiring.

  • Step 1 – Check terminals: Remove the thermostat front and verify the floor sensor wires are firmly connected to the designated sensor terminals (often marked S1/S2 or NTC).
  • Step 2 – Measure resistance: Disconnect the sensor and measure its resistance with a multimeter. Compare to Immergas NTC specifications for the approximate floor temperature.
  • Step 3 – Inspect cable path: If the sensor is in a conduit, check for pinched or cut cable at entry/exit points. Repair or replace accessible sections.
  • Step 4 – Replace sensor: If the sensor is open/shorted, install a new Immergas-compatible floor NTC sensor. Route it in a protective conduit if possible.
  • Step 5 – Reconfigure mode: In the thermostat menu, ensure floor sensor mode is enabled only if a sensor is actually installed. Disable it if not used to avoid E11.
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Repair Difficulty

Medium 3/5

Required Part

Immergas floor NTC temperature sensor
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