McQuay M5ACV 030 CR

No
Water flow error
Flow switch faulty or pump stopped
Is water flow error
persists?
To check & rectify
Main board faulty
Yes
To replace Main board
Short JK4 on
main board
No
Over voltage protection (OV/UN Voltage)
Power supply failure
Is Power supply
< 460VAC?
To rectify
Power board faulty
Yes
To replace Power board
Is Power supply
> 490VAC?
No
Yes
85