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Solar circuit pump is operating + switch-on condition is fulfilled but no heat transport in the
solar circuit (no heat transfer fluid circulation)
Air is in the solar circuit. Check the solar circuit for air.
The isolating valve is closed. Check the isolating valve.
Limescale or contamination in solar circuit Clean the solar circuit (flush).
Solar circuit pump shows cycle behaviour
Temperature difference too small Adjust temperature difference in
the Parameters settings menu.
Collector sensor incorrectly positioned Check the position of the collector
sensor and correct if necessary.
Tab. 4: General faults
13.2 Error messages
When an error message is displayed and no button has been pressed for 5 minutes, the
backlighting turns red and starts flashing.
The figures in this section show examples.
Display Description Remedy
An interruption was detected at the
displayed sensor input (in this case:
sensor input 2).
Check the cable and
sensor connected to
the sensor input.
A short-circuit was detected at the
displayed sensor input (in this case:
sensor input 2).
Check the cable and
sensor connected to
the sensor input.
The controller has detected a flow
rate fault in the primary or secondary
circuit. A permanently high tem-
perature difference exists between
the heat source and loading target.
Primary and secondary circuit pumps
are flashing. Possible causes:
• Air in system
• The isolating valve is closed.
• The pump is faulty.
• Bleed air from the
system.
• Check the isolat-
ing valve.
• Check the pump.
The controller has detected faulty
operation of the system. This is prob-
ably caused by swapped collector
connections.
Check the collector
connections.
A short-circuit exists at output R1, the
pump connected to output R1 flashes.
Possible causes:
• The pump is faulty.
• Wiring fault
• Check the pump.
• Check the wiring
to R1.
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