A.O. Smith BFC-120, Installation, User And Service Manual

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11 Troubleshooting
11.1 Errors and warnings
The water heater can have three different kinds of errors and warnings:
General errors, which are not displayed
Displayed errors, which are divided in two different groups:
Lock out errors: when the cause is removed, you can reset the error to resume
operation. The displayed code and the back-light of the display blink.
Blocking errors: when the cause is removed, the error resets automatically to
resume operation. The code is displayed continuously and the back-light of the
display blinks.
Errors are reported on the display as follows:
Line one: an error code and a brief description. The code consists of a letter
and two digits.
Lines two, three and four: a long description, alternating with a recommended
action. See the figures. The first shows a possible error, the second shows the
appropriate checking action.
Displayed warnings
Note
It is possible to view the error history of the water heater, refer to Error history (see
section 9.2.2).
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