Boiler displays E13 and will not operate.

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.

Possible Causes

Faulty outdoor temperature sensor, Broken sensor cable, Incorrect sensor wiring polarity, Faulty PCB sensor input.

Safety first: Turn off the power supply before working on control wiring.

Check if outdoor sensor is fitted: If your Remeha boiler uses weather compensation, locate the external sensor on an exterior wall.
Inspect sensor and cable: Look for physical damage to the sensor housing or cable, such as cuts, crushed sections, or signs of water ingress.
Engineer tasks: Measure sensor resistance at ambient temperature and compare it with Remeha charts, repair or replace the sensor and cable, and verify the correct connection to the low-voltage terminals on the PCB.

Medium 3/5

Outdoor Temperature Sensor

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