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14.4.12 H33 (Unspecified Voltage between Indoor and Outdoor)
Malfunction Decision Conditions
• The supply power is detected for its requirement by the indoor/outdoor transmission.
Malfunction Caused
• Wrong models interconnected.
• Wrong indoor unit and outdoor unit PCBs used.
• Indoor unit or outdoor unit PCB defective.
Troubleshooting
• Change outdoor main,
indoor main and PCB
When abnormality indication starts
again
Has the AC power input dropped
more than 50% of rating?
NO
Check DC Voltage after
rectification at outdoor or indoor
PCB. DC Voltage drops below
180Vdc
H33 occurs right after installation?
Has the indoor and outdoor model
matched in voltage rating?
• Match the compatible model
(follow specification
YES
NO
NO
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
YES
H33 occurs intermittently during
operation? (unit has operated
normally before)
NO
NO
Has the AC power input dropped
more than 50% of rating? (in most
cases customers do not aware of
the voltage drop but the installed
area has known power supply
issue
• Match the compatible model
(follow specification
YES
• Change outdoor PCB
H33 occurs right after servicing
and has never occur before?
NO
Has the PCB (indoor or outdoor)
being replaced?
NO
Confirm the replaced PCB part
number versus listed in Service
Manual.
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