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Error Cause Corrective Action
F153
Control calibration values not in
range.
Bad Power Board or Display
Board.
1. (If possible, re-calibrate.)
2. Check power and Display Board connectors P1B and associated
wiring.
4. If OK, replace Power Board.
5. If fault persists, replace Display Board.
F155
Checksum match error.
Wrong eeprom data on Display
Board.
1. If possible, re-write default data to the Display Board eeprom
via P7.
2. If not, replace Display Board.
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