Carrier DHMVHA Service Manual page 21

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DIAGNOSIS AND SOLUTION (CONT.)
Outdoor EEPROM Parameter Error or Compressor Driven Chip EEPROM parameter (EC51)
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
REMARKS:
EEPROM: A read-only memory whose contents can be erased and
Fig. 21 — EEPROM Chip
NOTE: For certain models, the outdoor PCB can not be removed
separately. In this case, the outdoor electric control box
should be replaced as a whole. The pictures in this manual
are only for reference. The actual appearance may vary.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
EC51
Outdoor PCB main chip does not receive feedback from EEPROM chip or compressor driven chip.
Outdoor
Shut off the power supply and
turn it on 2 minutes later.
Is it still displaying
the error code?
YES
Replace the outdoor main PCB.
NO The unit is operating normally.
reprogrammed using a pulsed voltage. The location of the EEPROM
chip, on the outdoor PCB, is shown in Figure 21.
21