Troubleshooting
Electrical Control System
122
2.4.4.4
.
E1 malfunction
Current loop communication:
Malfunction
conditions
Indoor unit does not receive feedback from outdoor unit for 110
seconds. This occurs 4 times in a row.
Possible causes
●
Wiring mistakes
●
Faulty indoor or outdoor PCB
Measure Vs. Is it a positive
fluctuation?
(Vs is the voltage between S and N of
outdoor unit. Red pan-S, Black pan-N.)
Measure Vs. Is it a positive
fluctuation?
(Vs is the voltage between S and N of
outdoor unit. Red pan-S, Black pan-N.)
Yes
Power off, then restart the unit 2 minutes later.
Does a problem still exist?
Power off, then restart the unit 2 minutes later.
Does a problem still exist?
No
Replace the outdoor main PCB.
Power on. Is the error resolved?
Replace the outdoor main PCB.
Power on. Is the error resolved?
Check the outdoor wiring connection. Has
the problem been resolved?
Check the outdoor wiring connection. Has
the problem been resolved?
Replace the indoor main PCB.
Power on. Is the error resolved?
Replace the indoor main PCB.
Power on. Is the error resolved?
Yes
Replace the outdoor main PCB
Replace the outdoor main PCB
No
Replace the indoor main PCB
Replace the indoor main PCB
No
Check the indoor wiring connection
Check the indoor wiring connection
Yes
Yes
Is the reactor
functioning normally?
Is the reactor
functioning normally?
Yes
Replace the reactor
Replace the reactor
No
Summary of Contents for 38QUS012D8S
Page 1: ...Contents i Energy Related Products SUPER DC INVERTER SERIES Service Manual...
Page 13: ...Service Space Indoor Units 11 3 Service Space 1000mm 1000mm 1000mm 1000m m Chart 3...
Page 16: ...Air Velocity Distributions Reference Data Indoor Units 14 30 42K Cooling Heating...
Page 17: ...Air Velocity Distributions Reference Data Indoor Units 15 48 55K Cooling Heating...
Page 22: ...Field Wiring Indoor Units 20 10 Field Wiring 42QTD018R8S 42QTD024R8S 42QTD036R8S...
Page 23: ...Field Wiring Indoor Units 21 42QTD048R8S 42QTD060R8S...
Page 29: ...Features Indoor Units 27...
Page 46: ...Service Space Indoor Units 44 3 Service Space...
Page 61: ...Wiring Diagrams Outdoor Units 59 3 Wiring Diagrams 38QUS018R8S...
Page 62: ...Wiring Diagrams Outdoor Units 60 38QUS024R8S...
Page 63: ...Wiring Diagrams Outdoor Units 61 38QUS036R8S...
Page 64: ...Wiring Diagrams Outdoor Units 62 38QUS036R8T...
Page 65: ...Wiring Diagrams Outdoor Units 63 38QUS048R8T 38QUS060R8T...
Page 87: ...Refrigerant pipe installation Installation 85...