Troubleshooting By Error Code; Eh 00 /Ec 51(Eeprom Parameter Error Diagnosis And Solution) - MrCool DIY-MULTI2-18HP230C Service Manual

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
Shut off the power supply and
Shut off the power supply and
turn it on 2 minutes later.
turn it on 2 minutes later.
Is it still displaying
Is it still displaying
the error code?
the error code?
YES
Replace the indoor main
Replace the indoor main
PCB.
PCB.
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.
The unit is operating normally.
NO
The unit is operating normally.
 Troubleshooting 27
EC 51
Shut off the power supply and
Shut off the power supply and
turn it on 2 minutes later.
turn it on 2 minutes later.
Is it still displaying
Is it still displaying
the error code?
the error code?
YES
Replace the outdoor main
Replace the outdoor main
PCB.
PCB.

NO The unit is operating normally.
The unit is operating normally.