Diagnosis And Solution - Midea MS9A-05CR-QD0 Service Manual

9.2 Diagnosis and Solution

9.2.1 EEPROM parameter error diagnosis and solution
Shut off the power supply and
turn it on 5 seconds later. Is it
still displaying the error code?
Yes
If the EEPROM chip
is welded on main
PCB, replace the
main PCB directly.
Otherwise, check
whether the
EEPROM chip
plugged in main PCB
well?
Yes
Replace the indoor main
PCB.
EEPROM: a read-only memory whose contents can be erased and reprogrammed using a pulsed
voltage.
9.2.2 Zero crossing detection error diagnosis and solution
Check if the connections and
power supply is normal?
Yes
Indoor main PCB is
defective. Replace indoor
main PCB.
No Correct the connection.
Correct the connections. Turn on the
No
unit when the power supply is good.
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