Remedy: Defective engine PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace engine PWB.
Code: F278
Description: Power supply in drive system error
Causes: Main power switch was turned off without using the power key, or a power failure has occurred.
Remedy: Main power switch was turned off without using the power key, or a power failure has occurred. Turn on power. (To switch off power, first press the power key, then turn the main power switch off.)