Diagnosis And Solution - ComfortStar CVH-18-2SH Service Manual

7.4 Diagnosis and Solution

7.4.1 Indoor unit trouble shooting
7.4.1.1 Indoor unit EEPROM parameter error diagnosis and solution.
Malfunction conditions
Potential causes
Trouble shooting:
EEPROM: a type of read-only memory. The contents can be erased and reprogrammed using a pulsed
voltage. To locate the EEPROM chip,.
Indoor or outdoor PCB main chip does not receive feedback
from EEPROM chip.
Installation mistake
●
Faulty PCB
●
Power off, then restart the
unit 3 minutes later. Does
a problem still remain?
Yes
Replace the indoor/outdoor
main PCB.
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