Troubleshooting
9.2.3.5 Diagnosis of compressor synchronism (outdoor unit malfunction)
Indoor display: H7 (dual-8 display), heating indicator is off for 3S and blinks 7 times.
Main detection point:
z Is the system pressure over-high?
z Is the work voltage over-low?
Malfunction diagnosis process:
If the compressor wire COMP(UVW) is well
connected, the connection sequence forwards to
clockwise direction?
Check if the fan
terminal OFAN is
connected well
Replace
compressor
If the outdoor fan works normally?
If the stop time of
compressor is more than
3min
finish
Synchronism after
energize the unit
and start it
Connect
wire well
Synchronism
occurred during
operation
Replace
control board
AP1
If the radiating of unit is well?
Remove
malfunction?
Improve the radiating
of unit (clean heat
exchanger and
increase ventilation)
Replace fan
capacity C1
Replace
outdoor fan
finish
Y
N
N
N
Y
Y
N
Replace
control board
AP1
Remove
malfunction?
Replace
compress
Y
N
N
Y
If the input voltage of unit is
normal?
Start to run until the
power resume normal
voltage
N
If the refrigerant is too much?
Charge the
refrigerant with
service manual
Y
Y
N
Y
50
To Next Page
Loading...
