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17
Problem Cause Checks
the compressor does not start
(signaled by the compressor LED flashing)
• compressor delay set defrost post
• dripping in progress
parameters c0, c1 and c2 and dd
the temperature is over the set limits but there
is no alarm message and the buzzer, if fitted,
does not sound
alarm delay set parameters Ad, c6, d8
alarm IA is signaled (multifunction input)
without actually being active
the multifunction input generates an
alarm when the contact opens
connection of the input and whether
this is closed in normal operation
the alarm connected to the multifunction
input is not detected
alarm delay set or parameter
programming error
1. if A4=1
2. the status of digital input A7
the defrost is not activated
defrost duration too short (dP)
interval between defrosts dI=0:
in this case the defrost is not activated
parameters dP and dI
the end defrost temperature is too low or
the evaporator temperature is too high
parameters dt and d/ (defrost probe)
the manual defrost is not activated and the
defrost LED flashes
compressor protection times set parameter d9 (select d9=1)
the high temperature alarm is shown
after a defrost
the alarm delay after defrost is too
short or the alarm threshold is too low
parameters d8 and AH
the display remains frozen even
after the defrost
the ambient temperature has not yet
reached the set point or alternatively
the time d8 has not elapsed
wait or reduce d8
after modifying a parameter the controller
continues working with the old values
the instrument has not updated the old
value or alternatively the parameter setting
procedure has not been ended correctly
by pressing the SET button for 3 s
turn the instrument o and on again
or alternatively reprogram the
parameters correctly
the evaporator fan does not start 1
1. a compressor and fan start delay has
been set
2. if F0=1 (fan managed by fan controller)
• the evaporator is “hot”: the evaporator
temperature can be read by selecting
parameter /d
• dripping in progress
• F1 (evaporator fan control set point)
too low
• post-dripping delay set
3. if F0=0
• F2=1 and the compressor is o
• dripping in progress
• post-dripping in progress
1. parameter c0
2. parameters F0, F1, Fd, dd and d/
3. parameters F0, F2, dd and Fd
TROUBLESHOOTING
The following table shows a number of situations that may occur on the various models.
The most frequent causes and corresponding checks are described:
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