Troubleshooting Guide

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.