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6. Troubleshooting
The following contains descriptions of what measures to take in
order to remedy problems. If you are still unable to fix the problem
using this information, please consult your heating contractor.
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Fault/error message at the controller
There is a fault in the system; the sensor is faulty or incor-
rectly connected.
Please refer to the controller operating and installation
instructions.
Pressure fluctuations in the system
If the problem occurs immediately after commissioning,
there is air in the solar circuit.
Please consult a qualified contractor.
The collectors are misted up.
Moisture has got in during storage.
The internal mist will evaporate after a few weeks
in operation. 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 ex-
ceeded. 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 fuses/MCBs.
Other cause
Please consult a qualified contractor.
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.
Please consult a qualified contractor.
The pump is running, but no flow rate is
discernible at the flow meter with balancing
valve.
The shut-off valve is closed.
Open the shut-off valve.
Other cause
Please consult a qualified contractor.
The pump appears to start late and switch
itself off early.
Please consult a qualified contractor.
The pump starts and switches itself off again
shortly afterwards. This repeats a few times
until the system runs correctly. The same hap-
pens in the evening.
There is still too little insolation to heat up the entire
pipework.
Check for faults again when there is strong insolation.
Other cause
Please consult a qualified contractor.
The pressure gauge indicates a drop in pres-
sure.
A pressure drop shortly after the system is filled is quite
normal, as air is still escaping from the system. A pres-
sure drop later on can be caused by an air lock that has
shifted. In addition, during normal operation the pressure
fluctuates by 0.02-0.03 MPa depending on the system
temperature. If the pressure drops continuously, the sys-
tem is leaking somewhere.
Please consult a qualified contractor.
The pump runs noisily.
Please consult a qualified contractor.
The system runs noisily. This is normal in the
first few days after filling. If this occurs later:
Please consult a qualified contractor.
The cylinder cools down over night. After the
pump has switched off, the flow and return
operate at different temperatures. At night the
collector temperature is higher than the out-
side temperature.
The gravity brake does not close.
Check the position of the adjusting screw on the grav-
ity brake.
Other cause
Please consult a qualified contractor.
Reheating does not work. The boiler runs
briefly, stops and starts again. This repeats
frequently, until the cylinder has reached its
set temperature.
Please consult a qualified contractor.
The cylinder cools down excessively.
Please consult a qualified contractor.
The pump does not switch off.
The control unit is faulty.
The variable speed pump does not switch off immedi-
ately but only after it reaches its lowest speed.
Other cause
Please consult a qualified contractor.
