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13. Troubleshooting
The following table of faults also contains all troubleshooting measures included in the chapter "What to do if".
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Fault/error message at the controller
There is a fault in the system; the sensor is faulty or
incorrectly connected.
Please refer to the controller operating and installation in-
structions.
Pressure fluctuations in the system
If the problem occurs immediately after commis-
sioning, there is air in the solar circuit.
Vent the system.
The collectors are misted up.
Moisture has got in during storage.
The internal mist will evaporate after a few weeks in opera-
tion. The moisture will progressively escape through the
integral ventilation slots.
The pump does not run although the collector
is hotter than the cylinder (no noise from the
motor, no noticeable vibrations).
The maximum cylinder or collector temperature is
exceeded. The control indicator or display on the
controller is activated.
The controller has shut down correctly and restarts again
automatically when the actual temperature drops below the
selected maximum temperature.
The power supply is interrupted.
Check pipes and fuses/MCBs.
Excessive temperature differential (>15 °C) selected
or the controller does not work.
Check the controller.
Check the temperature sensor.
Reduce the temperature differential.
Pump shaft blocked.
Briefly switch to maximum speed or, if possible, open the air
vent screw on the pump. Insert a screwdriver into the notch
and turn the pump wheel by hand.
The pump is contaminated.
Dismantle and clean the pump. Close the flow limiter and the
pump ball valve.
The sensor is faulty.
Replace the sensor.
The sensor is fitted incorrectly.
Check the position of the sensor. The collector sensor must be
fully inserted into the sensor well.
The pump is running, but no flow rate is
discernible at the flow meter with balancing
valve. The flow and return temperatures are
identical or the cylinder temperature does not
rise or rises only slowly.
There is air in the pipework,
the system pressure is too low or
the system is contaminated.
Check the system pressure. Check whether the selected
expansion vessel is large enough. Check the pre-charge pres-
sure of the expansion vessel.
Operate the pump in intervals at maximum pump rate.
Open the air vent valves on the collector, pump and solar
cylinder.
Flush the system forwards and backwards. Clean fitted com-
ponents, such as the flow meter with the balancing valve and
the dirt trap.
Check the line routing. In case of "up and down" line routing,
e.g. at balcony protrusions or around water pipes, change the
line routing if required, or insert an additional air vent valve.
Ensure that no automatic air vent valves that cannot be dis-
connected from the system using a ball valve are positioned
close to the collector .
Check the function of the automatic air vent valve. For this,
unscrew the protective cap and check the float with a blunt
needle to ensure it moves easily. Replace the air vent valve if
required.
The pump is running, but no flow rate is
discernible at the flow meter with balancing
valve.
The flow meter with balancing valve is stuck.
Check the function of the flow meter with balancing valve. A
jammed ring, for example, can block the display in the sight
glass, even if the flow rate is correctly adjusted. Switch the
pump ON in manual mode. The pump piston movement must
be discernible. Release the piston by tapping it lightly. Re-
place the flow meter and balancing valve if necessary.
The shut-off valve is closed.
Open the shut-off valve.
The pump appears to start late and switch
itself off early.
Excessive temperature differential between collec-
tor and cylinder.
Reduce the temperature differential at the control unit.
