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147
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4
[Open phase at L3 phase of 52C secondary side]
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
Notes (1) Also check if there is voltage at the L3 phase on the 52C primary
side, but no voltage on the secondary side (coil wire disconnec-
tion or faulty contacts).
(2) If there is voltage at the L3 phase on the 52C primary side and it
is not abnormal, the outdoor unit control PCB is faulty.
Error display :
e34
3
Error display
:
e33
[Compressor overcurrent trouble]
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
YES
YES
NO
NO
Is the voltage
AC220/240V between the
L1 and L3 phases and between the L2
and L3 phases on the 52C
secondary side?
Is there overcurrent
at the compressor?
Out of phase between the
L1 and L2 phases.
Check the unit side.
• Compressor is faulty. Replace
• 52C is faulty.
• There is a disconnection between
52C and CM or in the L1 and L2
phases between TB1 and 52C.
• During cooling: Is FMo turning?
• During heating: Is FM
I
turning?
Is the service valve (gas side) fully open?
Is the filter clogged?
• Is there an overcharge?
• Is the installation space for the indoor and
outdoor units proper?
• Is there a short circuit in the indoor or outdoor units?
(1)
Outdoor unit control PCB is
faulty. Replace
(The CT input circuit is faulty.)
• Is the power supply voltage proper? (Isn’t it too low?)
• Are the power lines proper? (Aren’t they too thin?)
• Is the overcurrent setting correct?
(1)
• Is the compressor running with an overload?
• Is the compressor locked?
Notes (1) Measure the overcurrent value to make sure. (Models FDCA301~601 only)
Also make sure the overcurrent setting set with SW3 and SW4-1 on the outdoor unit control PCB
is not incorrect.
52C
secondary side L3 phase
open?
Repair
YES
NO
The outdoor unit control PCB is faulty.
(The CT circuit is faulty) Replace
(1)
(2)
Only case of FDCA301~601
If the unit is operated with the service valve closed, 49C (internal ther-
mostat) operates. E34 may also be displayed. Check the service valve.