Grundfos COMFORT 10-16 - 8.2.3 The warning LED is permanently yellow while in temperature mode; 8.2.4 The pump is not learning usage patterns, insufficient hot water is supplied

8.2.3 The warning LED is permanently yellow while in temperature 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.
8.2.4 The pump is not learning usage patterns, insufficient hot water is
supplied
Cause Remedy
The external sensor is not installed
on the hot water supply pipe.
• Install the external sensor on the
hot-water supply pipe and not on,
for example, fittings or tee joints.
The external sensor is installed on
insulation.
• Ensure that the external sensor is
installed directly on the hot-water
supply pipe.
The external sensor is installed at an
incorrect distance from the water
heater.
• Ensure that the sensor is installed
at the correct distance.
There is no hydraulic balancing in
the branches of the pipe system.
• Perform hydraulic balancing and fit
regulating valves.
The temperature of the water is too
low (< 120 °F (48 °C)).
• Set the temperature of the water
heater to at least 120 °F (48 °C).
The pump is installed too close to the
water heater.
• Ensure the pump is installed at the
correct distance of the water heater
(min. 20 inches (50 cm)).
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