Troubleshooting
Electrical Control System
131
2.4.4.11. P4 Malfunction
The troubleshooting is same as the “
IPM module protection
”
2.4.4.12. J0 Malfunction
Malfunction conditions
When evaporator coil temperature is more than 60°C, the unit stops. It
starts again only when the evaporator coil temperature is less than
54°C
Possible causes
Faulty evaporator coil temperature sensor
Dirty heat exchanger
Faulty fan
Faulty PCB
J0 displayed
J0 displayed
Evaporator high temperature protection
Evaporator high temperature protection
Is the compressor operating?
Is the compressor operating?
Yes
Is the outdoor ambient
temperature is higher than 30
℃
?
Is the outdoor ambient
temperature is higher than 30
℃
?
No
Correct the connection
Correct the connection
No
Is the connection
between T2 and The
PCB is in working order?
Have T2 and T2B been
reversed?
Is the connection
between T2 and The
PCB is in working order?
Have T2 and T2B been
reversed?
Is the resistance of T2
normal according to
Appendix
1?
Is the resistance of T2
normal according to
Appendix
1?
Replace the temperature sensor
Replace the temperature sensor
No
Yes
Yes
Stop the unit
Stop the unit
Yes
Is the air-outlet blocked?
Is the air-outlet blocked?
Are the heat exchanger and
filter dirty
?
Are the heat exchanger and
filter dirty
?
Is the indoor fan running
normally?
Is the indoor fan running
normally?
No
Yes
Clean the air-outlet
Clean the air-outlet
Replace the indoor main
PCB
Replace the indoor main
PCB
Clean the heat exchanger and filter
Clean the heat exchanger and filter
Yes
No
Yes
Refer to the solution for the
malfunction of the fan speed being out
of control . Find the cause and resolve
the problem
Refer to the solution for the
malfunction of the fan speed being out
of control . Find the cause and resolve
the problem
No
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...