38MBRC: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
22
EC 51 (EEPROM Parameter Error Diagnosis and Solution)
Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip.
Recommended parts to prepare:
• Indoor PCB
• Outdoor PCB
Troubleshooting and repair:
REMARKS:
EEPROM: A read-only memory whose contents can be erased and reprogrammed using a pulsed voltage. The location of the
EEPROM chip on the indoor and outdoor PCB is shown Figure 19 and Figure 20.
Fig. 19 — EEPROM
Fig. 20 — EEPROM
NOTE: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should
be replaced as a whole. This pictures are only for reference, actual appearance may vary. Troubleshooting and repair of
compressor driven chip EEPROM parameter error and communication error between outdoor main chip and
compressor driven chip are same as EC 51.
Shut o the power supply and
turn it on 2 minutes later.
Is it still displaying
the error code ?
YES
Replace the indoor main PCB (EH
00 ) /outdoor main PCB (EC 51 ).
The unit is operating normally . NO
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