Error Codes - A.O. Smith 100 Series Installation And Operating Manual

ERROR CODES

Hard Faults and Soft Faults can be cleared following two steps:
1. Unlock the control (by pressing the
the interface is locked
2. Press the and buttons simultaneously for 3 seconds.
Soft faults are also automatically cleared after 15 minutes after the
fault condition occurred, if the conditions of the faults disappeared.
Code Fault description
E00 ECO (Dhw High-Limit)
E01 Flame out of sequence
E02 Repeated Flame Loss
E03 Ignition failure
E05 Blocked flue
E06 Blocked flue
E07 Tank Temperature Probe
(NTC) failure
E10 Water leak detected
E11 LDM open
E19 Missing short circuit be-
tween X6.6and X6.12
E20 Blower not running
E21 Blower speed error
E22 Blocked air inlet
E23 Blocked air inlet
button for 3 seconds), if
Table 24. Error Codes
Meaning
T > Tmax 201°F
Flame detected when it is not expected
Lost flame 3 times in 5 minutes
Failed to ignite "n" times in a row. ("n" is
configurable for development only. It can
be 1, 2, 3, 4, or 5)
Outlet Air Pressure SW open 3rd time in
less than one hour
Outlet Air Pressure SW open, 1st and 2nd
time
Tank Temperature Probe (NTC) open or
short or sensed temperature difference >
4°C
Vdc < 1.45
Vdc > 2V
Missing short circuit between X6.6and
X6.12
Blower speed < 200 rpm when blower
powered
Read speed not within +/- 10% of the Set
speed for more than 10 seconds
Inlet Air Pressure SW open 3rd time in less
than one hour
Inlet Air Pressure SW open, 1st and 2nd
time
If the fault condition is still set, the control will attempt to clear the
Soft Faults after another 15 minutes (and so on).
Auto Reset faults are cleared automatically when the fault condition
disappears.
Error type
Hard Fault, Buzzer beeping
once per second
Soft Fault
Soft Fault
Soft Fault
Soft Fault
Auto Reset Fault
Auto Reset Fault
Warning, Buzzer beeping
continuously
Warning, Buzzer beeping once
per second
Hard Fault, Buzzer beeping
once per second
Hard Fault, Buzzer beeping
once per second
Soft fault 3 times / Then Hard
Fault
Soft Fault
Auto Reset Fault
50
Clear/Exit
Manual Action
Reset in 15 minutes /
Manual action
Reset in 15 minutes /
Manual action
Reset in 15 minutes /
Manual action
Reset in 15 minutes /
Manual action
After post-purge
When condition corrected
When Vdc > 1.55
When Vdc < 1.8V, or long
press on "Minus"
Manual Action
Manual Action
Reset in 15 minutes /
Manual Action
Reset in 15 minutes /
Manual Action
After ventilation as long as
post-purge