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