A.O. Smith DRE PLUS, Installation, User And Service Manual

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Code and description Cause Measure
031 - 038
(Blocking error)
Power supply error
Problem with power sup-
ply
Supply voltage not correct. The measured voltage must be
400 VAC (-15%, +10%).
Voltage to the control board not correct. - Make sure that the wiring of the
400-28VAC transformer (E) is connec-
ted and not damaged.
- Check the transformer fuse (F2).
The measured voltage to the control board
must be 28 VAC (-15%, +10%).
XXX
(Lock out error)
Control error
Hardware failure
Internal error message from the control-
ler. - Cycle power to the water heater to re-
set the error.
- If the error persists, replace the con-
troller.
11.1.3 Warnings
Note
For the coding of the connections, refer to the Electrical wiring diagram (see A.5).
Indication Cause Remark
40D
No current detected
No current detected in one
or more heating circuit(s).
Damaged wiring and/or defective heat-
ing element. Do a performance check. (see 10.3)
Damaged wiring and/or defective cur-
rent sensor. - Make sure the wiring of the element
current sensors (D) is correct.
- Replace the wiring and/or the sensor.
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70 Installation, Maintenance and Service part
EN