Check code
1300
Low pressure trouble
No
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis Remedy
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Continued from the previous page
Is the outdoor unit short-cycled?
Is there dirt on the outdoor heat
exchanger?
Are pipes clogged or broken?
Is there a resistance detected?
Is there a resistance detected?
Is the voltage normal?
Is it free from any trace of over-
heating or burning?
Solve the short-cycle.
Wash the outdoor heat exchanger.
Defective pipes.
Replace the TH7.
Replace the indoor LEV
Replace the indoor controller board.
Disconnect the outdoor temperature
thermistor wiring and check the resistance.
Disconnect the indoor LEV wiring to check
the resistance.
Check the voltage and appearance of the
outdoor controller board.
(short-cycled)
(dirty)
(no short-cycle)
(no dirt)
Is there dirt on the indoor heat
exchanger?
Wash the indoor heat exchanger.
(dirty)
(no dirt)
Continue to the next page
Chart 2 of 3
37
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