E16 error; Sime water heater indicates sensor short circuit or wiring fault.

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

Shorted DHW NTC, Shorted inlet NTC, Damaged sensor cable, Moisture in sensor connector

Safety: Turn off power before testing sensors.

Steps:

Identify which sensor: Consult the Sime manual for your model to see whether E16 refers to DHW or inlet NTC.
Disconnect sensor: Unplug the suspected NTC from the board and measure resistance. If it reads near 0Ω, replace it.
Inspect cable: Look for crushed or melted insulation causing a short to chassis or between wires.

Professional help: If sensors and wiring are good, the main PCB may be faulty and should be replaced by a technician.

Medium 3/5

NTC Temperature Sensor

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