MrCool DIY-MULTI2-18HP230C, Service Manual

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 Troubleshooting 27 
8. Troubleshooting by Error Code
8.1 EH 00 /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:
EH 00 EC 51
Shut off the power supply and
turn it on 2 minutes later.
Shut off the power supply and
turn it on 2 minutes later.
Is it still displaying
the error code?
Is it still displaying
the error code?
YES
Replace the indoor main
PCB.
Replace the indoor main
PCB.
The unit is operating normally.
The unit is operating normally. NO
Shut off the power supply and
turn it on 2 minutes later.
Shut off the power supply and
turn it on 2 minutes later.
Is it still displaying
the error code?
Is it still displaying
the error code?
YES
Replace the outdoor main
PCB.
Replace the outdoor main
PCB.
The unit is operating normally.
The unit is operating normally. NO
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 in the following two images:
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.