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13.1 General faults
Display Possible cause Remedy
Controller not functioning at all
Display empty/
dark
Controller power supply is interrupted. • Check the controller power
cable.
• Check the fuse for the power
supply.
Controller constantly displays 12:00
12 flashes Controller power supply was interrupted
for longer than 15 minutes.
Set the time.
Solar circuit pump not operating + switch-on condition is fulfilled
Pump power supply is interrupted. Check the pump power cable.
Pump has seized up. Get the pump working again,
replace if necessary.
• The maximum storage tank tempera-
ture has been reached.
• The maximum collector temperature
has been reached.
• In multi storage tank systems: The sys-
tem has stopped due to a priority test.
• The minimum collector temperature
has not been reached.
• The maximum loading temperature
has been reached.
• Stagnation reduction is activated and
is actively intervening in the control
process.
• The storage tank has been deactivated
in the priority settings.
No fault
flashes
Pump has been switched off in manual
mode (off).
• No fault
• Switch to automatic mode if
necessary.
Solar circuit pump is operating + switch-on condition not fulfilled
• The following functions are activated
and are actively intervening in the
control process:
– Interval function
– Holiday function
– Anti-freeze function
• Blockage protection for the pumps is
being performed.
• No fault
• Deactivate the relevant func-
tion, if necessary.
flashes
Pump has been switched on in manual
mode (on).
• No fault
• Switch to automatic mode if
necessary.