Heatcraft Refrigeration Products PRO3 Top Mount H-IM-81E Installation And Operation Manual page 16

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:
Problem
the compressor does not start (signalled by
the compressor LED flashing)
the temperature is over the set limits but
there is no alarm message and the buzzer, if
fitted, does not sound
alarm IA is signalled (multifunction input)
without actually being active
the alarm connected to the multifunction
input is not detected
the defrost is not activated
the manual defrost is not activated and the
defrost LED flashes
the high temperature alarm is shown after a
defrost
the display remains frozen even after the
defrost
after modifying a parameter the controller
continues working with the old values
The evaporator fan does not start.
16
Cause
• compressor delay set defrost post
• dripping in progress
alarm delay set
the multifunction input generates an alarm
when the contact opens
alarm delay set or parameter programming
error
defrost duration too short (dP)
interval between defrosts dI=0: in this case
the defrost is not activated
the end defrost temperature is too low or the
evaporator temperature is too high
compressor protection times set
the alarm delay after defrost is too short or
the alarm threshold is too low
the ambient temperature has not yet reached
the set point or alternatively the time d8 has
not elapsed
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
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 off
• dripping in progress
• post-dripping in progress
Installation and Operations Manual
Checks
parameters c0, c1 and c2 and dd
parameters Ad, c6, d8
connection of the input and whether this is
closed in normal operation
1. if A4=1
2. the status of digital input A7
parameters dP and dI
parameters dt and d/ (defrost probe)
parameter d9 (select d9=1)
parameters d8 and AH
wait or reduce d8
turn the instrument off and on again or
alternatively reprogram the parameters
correctly
1. parameter c0
2. parameters F0, F1, Fd, dd and d/
3. parameters F0, F2, dd and Fd