Mitsubishi Electric CMB-WM108V-AA Service Handbook page 150

[ VIII Troubleshooting ]
2512
1. Error Code
2512
Valve block fault
2. Error definition and error detection method
Limit signal that is output from valve block is not detected or is not reset after it is detected.
3. Cause, check method and remedy
(1) Loose connectors, wiring fault
(2) Valve block fault
(3) Control board fault
HWE1708A
Cause Check method and remedy
When the LEDs on the control board (VB3a-VB3p) are lit,
check the valve block whose LED is lit for loose connectors,
wiring fault, and proper operation. When the LEDs de-
scribed above are not lit, check all the valve block for proper
operation.
If no problems are found with the above items, replace the
control board.
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