mundoclima MUPR-09-H11-E, Service Manual

Page: 124 / 149

TS08-S: Current overload protection diagnosis and solution
Description : An abnormal current rise is detected by checking the specified current detection circuit.
Recommended parts to prepare:
• Connection wires
• Reactor
• Outdoor fan
• Outdoor PCB
Troubleshooting and repair :
Was the protection activated
in standby?
Was the protection activated
in standby? Yes
Is the current normal ˛
Is the current normal ˛ Yes
No
Replace the outdoor main PCB
Replace the outdoor main PCB
Is the power voltage is normal?
Is the power voltage is normal?
Is outdoor terminal voltage
normal ˛
Is outdoor terminal voltage
normal ˛
Restart the unit when the power supply
returns to normal
Restart the unit when the power supply
returns to normal
No
Yes
No
Reconnect the
power wiring
Reconnect the
power wiring
Yes
Is the voltage between L and N
is normal ˛
Is the voltage between L and N
is normal ˛
Yes
No
Is the power wiring
wired correctly?
Is the power wiring
wired correctly?
Reconnect L and N
Reconnect L and N
Are L and N wired
properly?
Are L and N wired
properly?
No
No
While the unit is in standby,
is the voltage between P and N
is around DC 310V, 340V or
380V? When start up the unit,
is it in 220V~400V?
While the unit is in standby,
is the voltage between P and N
is around DC 310V, 340V or
380V? When start up the unit,
is it in 220V~400V?
Is the wiring of the
reactor properly wired?
Is the wiring of the
reactor properly wired?
Reconnect the wiring
Reconnect the wiring No
Are the reactor and
inductance functioning
normally
A d
Are the reactor and
inductance functioning
normally
Yes
Replace reactor
Replace reactor No
Is the outdoor ambient
temperature is higher than
50 ć ?
Is the outdoor ambient
temperature is higher than
50 ć ?
No
Stop the unit
Stop the unit Yes
Is the outdoor unit
ventilation functioning
properly?
Is the outdoor unit
ventilation functioning
properly?
Yes
Ensure that the outdoor unit ventilate
is working properly
Ensure that the outdoor unit ventilate
is working properly
Is the heat exchanger dirty?
Is the heat exchanger dirty?
No
Clean the heat exchanger
Clean the heat exchanger
Yes
Check whether the refrigerant
system is running normally
Check whether the refrigerant
system is running normally
Replace outdoor main
board. Does a problem still
exist?
Replace outdoor main
board. Does a problem still
exist?
Yes
No
Is the outdoor fan running
properly?
Is the outdoor fan running
properly?
Please refer to the solution of the
"fan speed is operating outside of
the normal range" malfunction.
Please refer to the solution of the
"fan speed is operating outside of
the normal range" malfunction.
No
Yes
No
Yes
Yes
Is system pressure too high?
Is system pressure too high?
Recycle the overcharged
refrigerant
Recycle the overcharged
refrigerant
Yes
Power on and measure the
voltage between P and N.
Power on and measure the
voltage between P and N.
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.
Service manual H11 series
e f
Troubleshooting 32