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SiENBE28-901
Troubleshooting
Air Cooled Refrigeration Condensing Unit
115
6.6.18 “
L4
” Malfunction of Inverter Radiating Fin Temperature Rise
Remote
Controller
Display
L4
Applicable
Models
LRMEQ5~20AY1
LRLEQ5~20AY1
Method of
Malfunction
Detection
Fin temperature is detected by the thermistor of the radiation fin.
Malfunction
Decision
Conditions
When the temperature of the inverter radiation fin increases above 93°C.
Supposed
Causes
Actuation of fin thermal (Actuates above 93°C)
Faulty inverter PCB
Faulty radiating fin thermistor
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
The radiation fin
temp. rises to over
87°C.
YES
NO
Turn OFF the power supply, and then
make measurement of resistance of the
radiation fin thermistor.
Is the resistance of
the thermistor
normal?
NO
YES
Connect and disconnect the
radiation fin thermistor connector
(X111A) to properly connect it.
Turn ON the power
supply to start operation,
and then check whether
the malfunction recurs.
YES
NO
Faulty radiation of power unit
• Blocked air inlet
• Dirty radiation fin
• High outdoor temperature
Replace the thermistor.
Replace the inverter PCB.
Continue the operation.
z
The radiation fin temperature
can have risen due to field
factors. In this case, check for
the following:
• Whether the radiation fin gets
stained.
• Whether air flow is interrupted
(due to dust or foreign matters)
or the fan propeller gets
damaged.
• Whether the outdoor air
temperature is too high.
(Reference) Reset temperatures
• LRMEQ5~20AY1, LRLEQ5~20AY1
Not more than 79°C for a period of one minute