• Whenever panel received a new alarm, an alarm message will pop up on the LCD. It shows type of alarm, alarm occurred time and date. Backlight blinking (if backlight is not OFF) and alarms buzzer produces beeping sound (if it’s set ON).
The buzzer will beep for 10 minutes after that stop for 5 minutes (with the backlight still blinking), this process keep looping until the alarm is dissolved or a key press is detected.
• Backlight will stop blinking via key press. Press UP or DOWN key to scroll the alarms display if more than one alarms occurred. Press ESC to exit to the summary pages.
• If one of the alarms has been dissolved, pop up message will update its display (would not show the dissolved alarm anymore). If all the alarms have been dissolved, it will exit to the summary pages automatically.
• If the existing alarm has not been dissolved and another new alarm is occurred, the pop up message will update to the latest alarm.
• A sign [A] will be shown and blink in Summary Pages as long as the alarm has not been dissolved. If user needs to view current existing alarms, press “ALARM” key in the summary pages or go to ALARM MENU in MAIN MENU.
• The panel can display up to 20 new alarms at once (which are not dissolve yet).
• All the incoming new alarms record will be store in ALARM MENU – Show Alarms.
• The alarm histories are viewable ONLY when all the new alarm already dissolved.
• If the contact type alarm is set to manual reset, the alarm can only be dissolved by off and on back
rooftop unit.
Error Message Possible causes Action
Communication wires not connected Connect correctly and operate again.
External noise / interference Avoid from noise source / add ferrite core.
Main PCB / Economizer PCB faulty Replace main PCB / economizer PCB.
2. Memory Error EEPROM data corrupted Replace main PCB and operate again.
3. Economizer Error Refer to the economizer board error
code table. Refer to the economizer board
error code table.
4. ESD contact open Normally close ESD contact become open ESD contact shorted with wired. If fail, replace main board and operate again.
Insufficient airflow / Air short circuit / Ensure no obstacle around the unit.
Heat exchanger dirty Ensure no dirt or dust on filter and coil.
Refrigerant overcharge / undercharge Recharging with correct amount of refrigerant.
Condenser fan motor faulty Replace fan motor.
EXV or EXV PCB defective Replace EXV or EXV PCB.
Compressor malfunction Replace compressor.
Main PCB faulty Replace main PCB.
Refrigerant undercharge Top up with correct amount of refrigerant.
Pressure switch faulty Replace pressure switch.
Main PCB faulty Replace main PCB.
Insufficient airflow / Air short circuit Ensure no obstacle around the unit Heat exchanger dirty Ensure no dirt or dust on filter and coil.
Condenser fan motor faulty Replace fan motor.
Refrigerant overcharge Recharging with correct amount of refrigerant.
EXV or EXV PCB faulty Replace EXV or EXV PCB.
High Pressure switch faulty Replace pressure switch.
Main PCB faulty Replace main PCB.
Discharge sensor malfunction Replace new discharge sensor.
Insufficient airflow / Air short circuit Ensure no obstacle around the unit.
Heat exchanger dirty Ensure no dirt or dust on filter and coil.
Condenser fan motor faulty Replace new motor.
Main PCB faulty Replace main PCB.
9. Disconnection of discharge
thermistor 1 / 2 Poor sensor connection Connect correctly and operate again.
Discharge sensor malfunction /
poor sensor connection Connect sensor correctly / replace sensor.
Insufficient Air Flow / Air Short Circuit Ensure no obstacle around the unit.
Heat Exchanger Dirty Ensure no dirt or dust on filter and coil.
Condenser fan motor faulty Replace new motor.
Compressor malfunction Replace new compressor.
EXV or EXV PCB faulty Replace new EXV.
Main PCB faulty Replace main PCB.
Poor coil sensor connection Connect sensor correctly / replace new sensor.
Compressor malfunction Replace new compressor.
Leaking in piping joint Fix the leak point / Change coil.
EXV or EXV PCB faulty Replace new EXV.
Main PCB faulty Replace main PCB.
1. MB & economizer communication fail
5. Compressor 1 / 2 overload
6. Compressor 1 / 2 low pressure trip
7. Compressor 1 / 2 high pressure trip
8. Compressor 1 / 2 discharge overheat
10. Heat Exchanger 1 / 2 high temperature
11. Indoor HEX 1 / 2 abnormal
temperature
Seven segment display Error
Code Fault
F0 Fresh air actuator faulty/ malfunction F1 Return air actuator faulty/ malfunction F2 Communication error
F3 CO2 sensor short F4 CO2 sensor open
F5 Fresh air RH sensor short F6 Fresh air RH sensor open F7 Return air RH sensor short F8 Return air RH sensor open F9 Activation of actuator protection
FA Multiple pins selection in Dip Switch 1, 2 or 3
The error codes will be shown on the seven segment display on the economizer controller board.
There are two LEDs in economizer controller board, which are green LED and red LED. Green LED will blink when economizer controller board is powered-up. Red LED will blink when error(s) occur. Refer the table below for error codes and their meaning:-
Note:
Note:
When error(s) occur and the faults persist, please call your authorized local dealer/ serviceman for troubleshooting.
However, all the errors occur in economizer controller board will not affect the normal operation of rooftop unit.
Error Message Possible causes Action
Motor internal over current protection faulty Winding resistance out of spec
Fan motor short body
Main PCB faulty Replace main PCB
13. Return air sensor short / open Faulty Sensor / Poor sensor connection Connect sensor correctly / replace sensor.
14. Outdoor air sensor short / open Faulty Sensor / Poor sensor connection Connect sensor correctly / replace sensor.
15. Comp discharge sensor 1 / 2 short Faulty Sensor / Poor sensor connection Connect sensor correctly / replace sensor.
16. Comp discharge sensor 1 / 2 open Faulty Sensor / Poor sensor connection Connect sensor correctly / replace sensor.
17. Outdoor HEX sensor 1 / 2 short Faulty Sensor / Poor sensor connection Connect sensor correctly / replace sensor.
18. Outdoor HEX sensor 1 / 2 open Faulty Sensor / Poor sensor connection Connect sensor correctly / replace sensor.
19. Indoor HEX sensor 1 / 2 short Faulty Sensor / Poor sensor connection Connect sensor correctly / replace sensor.
20. Indoor HEX sensor 1 / 2 open Faulty Sensor / Poor sensor connection Connect sensor correctly / replace sensor.
Replace indoor fan motor.
12. Indoor fan overload
In document
R410A Rooftop Packaged B Series
(сторінка 72-75)