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User Guide | Optyma™ iCO2
5.7 Error code list
(1) Maintenance code (oPE code)
If conditions corresponding to each item are satisfied, the maintenance code (oPE code) is displayed on the 7-segment display. For details of display,
refer to the following table.
7-segment display
Item
oPE-3
Total compressor operation time since last maintenance > 30,000 h
Number of the error detection stops within 60 min. after first stop
oPE-11
[Low pressure error count (load side stop)] = 120 times
oPE-88
Compressor oil shortage detection
(2) Error code
If the unit is stopped fully by error, the code corresponding to error content is displayed on the 7-segment display. For details of display, refer to the
following table.
7-segment
Protective device symbol
display
Power source phase loss Power
E32
source reverse phase
E36-1
Discharge pipe temperature error
Gas cooler temperature sensor
E37-1
No.1 error
Gas cooler temperature sensor
E37-2
No.2 error
Middle pressure receiver inlet
E37-3
temperature sensor error
Injection inlet temperature
E37-4
sensor error
Subcooling coil temperature
E37-6
sensor error
Liquid feed pipe temperature
E37-7
sensor error
Outdoor air temperature sensor
E38
error
E39-1
Discharge pipe temperature error
E40
63H High pressure switch
Power transistor overheat ( 5
E41-1
times in 1 hour)
E42-1
Current cut
© Danfoss | Climate Solutions | 2023.01 | LCA012A030
Cause
Phase loss (incl. under-voltage)
Power source reverse phase
Refrigerant gas shortage
Liquid bypass circuit failure
Gas cooler temperature sensor
blown wire, short-circuit are
detected
Middle pressure receiver inlet
temperature sensor blown wire,
shortcircuit
are detected
Injection inlet temperature sensor
blown wire, short-circuit are
detected
Subcooling coil temperature
sensor blown wire, short-circuit are
detected
Liquid feed pipe temperature
sensor blown wire, short-circuit are
detected
Out door air temperature sensor
blown wire, short-circuit are
detected
Discharge pipe temperature
sensor blown wire, short-circuit are
detected
Less air passing through gas cooler
Low compressor speed
Under overload state
Clogged high pressure side
refrigerant pipe
Overheat of power transistor
Stops with power transistor
temperature sensor blown wire,
output error detection
Detect the anomalous output
current of inverter
Synchronized with simplified remote monitor trigger timing
Synchronized with simplified remote monitor trigger timing
Oil level error is valid when SW6-5 and SW6-7 are OFF.
Inspection
Volt check at 3 phase
See page 26 "(2)..." Prevention of reverse phase operation" and change
connection
Flash gas generation or no in sight
glass
Defective electronic expansion valve
Defective gas cooler temperature
sensor, connector disconnection or
short-circuit
Defective middle pressure receiver
inlet temperature sensor, connector
disconnection or short-circuit
Defective injection inlet temperature
sensor, connector disconnection or
short-circuit
Defective subcooling coil temperature
sensor, connector disconnection or
short-circuit
Defective liquid feed pipe temperature
sensor, connector disconnection or
short-circuit
Defective outdoor air temperature
sensor, connector disconnection or
short-circuit
Defective discharge pipe temperature
sensor, connector disconnection or
short-circuit
Much dust on gas cooler
Clogged gas cooler suction inlet, blow
outlet
Fan speed control failure
High gas cooler suction air temperature Repair short-circuit
High suction gas pressure (low
pressure)
Defective oil separator outlet check
valve
Defective power transistor temperature
sensor, connector disconnection or
short-circuit
Check the inverter output
Compressor wiring, connector
disconnection or short-circuit
Remark
Measures / Countermeasures
Security of correct connection,
power source voltage
Additional refrigerant charge
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Wash, remove
Remove
Replace parts
Adjust as specified
Remove
Replace power transistor cooling
fan or power transistor
Replace power transistor
temperature sensor
Replace inverter or compressor
Replace wiring or power
transistor
BC408445719305en-000101 | 43
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