Error Code [4121] - Mitsubishi Electric PUHY-P200 Service Handbook

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-6

Error Code [4121]

1. Error code definition
Function setting error
2. Error source, cause, check method and remedy
Error source
Outdoor unit (1) Dip switch setting error on the control board
(2) Connector connection error on the control
board
(3) Control board failure
HWE14040
Cause
- 185 -
Check method and remedy
Check the SW6-1 setting on the control board
Check that nothing is connected to the connector
CNAF on the control board.
Replace the control board if no problems are
found with the two items above.
GB