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10.2 Faults not indicated on the display
Type of fault
Effect
Pump not running even though conditions for switching on are met.
The solar cylinder is not
being supplied by the
solar heating system.
The system animation on the display is running and the pump is "humming".
The solar cylinder is not
being charged by the solar
heating system.
Tab. 14
Possible faults not indicated on the display
Possible causes
No power supply; fuse or
power cable faulty.
The temperature at the bottom
of the cylinder is close to, or
above the set maximum
cylinder temperature.
The collector temperature is
close to, or above the set
maximum collector
temperature.
There is no electrical power to
the pump or it is not
connected.
Cooling function active.
The programmer checks which
cylinder can be charged (only
in systems with two cylinders)
Pump is faulty.
The pump is stalled due to a
mechanical blockage.
6 720 644 593 (2010/04)
FAULT FINDING
Remedy
Check fuse and replace if
necessary. Have electrical system
checked by an electrician.
When the temperature drops 3 K
below the maximum cylinder
temperature, the pump switches
on.
When the temperature drops 5 K
below the maximum collector
temperature, the pump switches
on.
Check the line.
–
–
Check pump and replace if
necessary.
Unscrew and remove the slotted
screw on the pump head and use
a screwdriver to release the
pump shaft. Do NOT strike the
pump shaft with the screwdriver.
81
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