Mal-
function
Possible causes
Checks
Remedial measures
ALF01
Fan motor overload
Motor overload protection
switch triggered? Fan power
consumption too high?
Check motor overload protec-
tion switch (setting range),
have the fan checked by a
specialist company.
ALT01
Compressor maintenance
Compressor maintenance
interval has been reached
After maintenance by a spe-
cialist company, reset the
operating hours. See chapter
“Resetting the operating
hours”.
ALT04
Pump maintenance
Pump maintenance interval
has been reached
After maintenance by a spe-
cialist company, reset the
operating hours. See chapter
“Resetting the operating
hours”.
ALU02
Frost protection malfunction
Inlet temperature lower than
4 °C?
Raise return flow temperature,
increase medium flow rate,
adjust antifreeze temperature
to the operating medium.
ALD01
EEPROM malfunction
ALG01
Mains current has incorrect
direction of rotation
Check the phase sequence
relay
Swap the phase conductors of
the power supply on the ter-
minal block on the control
panel.
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