Redring [E2] fault codewhat it means and how to fix it

Redring’s table entry is abnormal inlet sensor, the sensor is open-circuited or short-circuited, with the Start/Stop button light flashing three times, and the remedy is to contact Redring Support. The inlet sensor is the less famous of the two thermistors but it does the arithmetic. An electric shower has a fixed amount of heat to add and the temperature you get depends on how cold the water arrived: mains water in January can be six degrees and in August eighteen, and the Selectronic reads that figure every second to decide how many of its elements to energise and how far to open the flow valve. With the inlet reading missing the control would have to assume a temperature, and assuming wrong in the cold direction means a shower that scalds.

Redring’s guide gives the code and the instruction to contact them and says nothing about what the shower does meanwhile, so this page does not either; the safe reading of a thermostatic shower that has lost its inlet figure is that it should not be asked to heat water until the sensor is replaced. That makes the code frustrating because nothing feels wrong: the water is reaching the unit, the outlet sensor is fine, and the display is the only sign.

The sensor sits in the inlet assembly on the cold side, so it lives with the strainer and the solenoid valve, and the causes are the same family as any low-voltage sensor in a wet box: a lead disturbed during a filter clean, a plug backed off the board, a thermistor that has drifted out of range, or corrosion on the connection. Diagnosing which is a resistance check with the power off, which Redring place in the professional service checklist. The owner’s part is small but real: one power cycle, noting the flash count so the right part comes on the van, and not running the shower repeatedly against the code.