Cause Remedy
The non-return valve in the system is
faulty.
• Replace the non-return valve.
The motor is faulty. • Replace the motor.
8.2 COMFORT TA
8.2.1 The pump is not running, and the LEDs are flashing
Cause Remedy
There may be several reasons for
this:
The pump is waiting for water to cool
down in order to start again.
The pump is in vacation mode (no
water usage detected).
There is no predicted hot water
demand.
• Check the current control mode.
• Wait until next pump start or run hot
water through a tap.
8.2.2 The warning LED is permanently yellow while in AUTOADAPT mode
Cause Remedy
The external sensor cable has been
interrupted or the sensor is defect.
• The pump automatically switches to
temperature mode and continues
operation using the internal sensor.
The internal sensor is defect. • The pump automatically switches to
continuous 24/7 mode and
continues operation.
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