Skope ActiveCore SKT series, Service Manual

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79
SKOPE TME ActiveCore
Troubleshooting
Service Manual
7
Troubleshooting
Controller Alarms
Alarms signal unexpected operational changes in the chiller. When an alarm
is activated, use the following charts to assist with fault diagnosis and
service as necessary.
Electronic controller alarms
Alarm Possible Cause Repair
Door alarm. The door has been
open for longer than parameter
A10 time. An alarm sounds, and
the controller turns the compressor
and evaporator fan off.
• Door is open • Close door
• Door/s not aligned correctly • Realign door/s
• Door switch/es not aligned • Realign door switch/es
• Door switch cable not connected
to electrics box correctly.
• Check connection in electrics
box.
• Door switch cable plug and
sockets not connected correctly.
• Check connection of door switch
cable plug and sockets in
refrigeration unit compartment.
• Door switch cable damaged. • Inspect door switch cable, and
repair or replace if necessary.
• Use multi meter to check for
signal through lead when
opening and closing door/s.
• Door switch faulty. • Disconnect door switch plug and
use multi meter to check open/
closed signal while opening and
closing door.
Refrigeration system error. An
alarm sounds and the controller
turns the chiller off to avoid
damage. This alarm is triggered if
no-downward tendency protection
is triggered twice consecutively.
• Cabinet not installed correctly. • Check the installation meets
specification. Ensure there are
no blockages in front or behind
chiller. Make installation changes
or advise shop-keeper of any
changes required.
• Abnormal environmental
conditions.
• Discuss with shop staff to
determine and advise why alarm
occurred and how to avoid it in
future.
• Very high use of chiller
• Condenser blockage. • Check and clean condenser filter
and coil.
• Door/s not closing and sealing. • Service the door/s.
• Refrigeration unit not sealing
properly.
• Inspect seal between top of
cabinet and bottom of
refrigeration unit. Reseal as
necessary.
• Remove refrigeration unit and
inspect gasket condition.
Replace gasket if damaged.
• Electronic controller not reading
correct temperature.
• Investigate temperature probe or
electronic controller fault.
• Fans and/or compressor not
running correctly.
• Investigate fan, compressor and/
or compressor electrics fault.
Probe fault. An alarm sounds.
• Probe not securely fitted. • Secure loose probe.
• Probe is open circuit. • Replace probe.
• Controller fault. • Replace controller.