Troubleshooting And Alarms; Troubleshooting; Alarms - Danfoss EET Series User Manual

Refrigeration controller, type EET series

Troubleshooting and Alarms

Troubleshooting

Table 26: Troubleshooting
Problem Probable cause
Compressor does not start Spindle is in "OFF" position
Waiting for power on delay
Cabinet air temperature is less than compressor cut-in temp.
Defrost is in progress
Line voltage is too low or too high
High condenser temperature
Fan does not start Door is open or door contact is defective
Fan stopped due to high evaporator temp.
Fan start delay and temp. after defrost
Defrost does not start Controller in Initial Pull Down or Pull-down mode
Alarm does not sound Alarm delay
Does not maintain correct cabi- Cabinet air sensor fault
net temperature
Potentiometer fault
Frost is not fully melted during Evaporator sensor position not proper Too long defrost intervals
defrost Configured defrost time is too short

Alarms

Alarms (advanced version only) Indication
The EET controller indicates the fault or failure in the refrigeration system via an LED flashing pattern, sending a
message via MODBUS to KoolProg or any other tools. Below the LED blinking pattern for various alarms are stated:
Table 27: Alarms
No. Fault
1 Low and High temperature alarm
2 Line Voltage Alarm
3 Condenser alarm
4 Sensor error
5 Potentiometer error
6 Leakage alarm
Figure 26: Indication of Line Voltage Alarm
Block 1 Block 2
¹/4 sec.
1 sec.
4 sec.
 NOTE:
1. LED blinking every one second indicates power ON status and no alarm conditions.
2. Alarms to be interpreted as per block1 and block 2 blinking pattern as given in the table. After block 1 and Block
2 blinking there is about 2.5 seconds gap.
3. If there are multiple alarms, LED blinking pattern shows the alarm raised first, next active alarm will be displayed
only when the first raised alarm is fixed.
© Danfoss | Climate Solutions | 2023.07
Block 1 Block 2
Remedy
Change spindle position by rotating clockwise.
Check and wait untill "Pod" expiries.
Check cabinet air sensor temp. "att"
Check and wait untill dAt and dot expires.
Check line voltages are within low and high voltage limits speci-
fied under uLi, uLo and uHo.
Check for condenser sensor temp'ct1' and configured condenser
block limit'cbL' .
Check "Fdt" and door status. Check that door contact is ok
Check evaporator sensor temp. "Et1/Et2" and FLt.
Check for 'Fdd' and "Ftd" parameters' configuration
Defrost is skipped during pull-down. Check the thermostat sta-
tus and configured pull-down duration.
Check alarm delay for temperature 'Ltd /Htd' and door 'dod'
Check the S1 sensor and sensor alarm status
Check the controller potentimeter function
Check the position and fitting of the evaporator sensor
Check for configured dii, dAi, dit and dAt values
No. of flashes (Block 1)
1
1
1
2
2
3
BC320944106159en-000301 | 28
No. of flashes (Block 2)
1
2
3
1
2
1