A.O. Smith Water Heater 520 Direct Vent Indoor Service Manual page 58

<Description of mode numbers in "Diagnostics Mode" for individual unit>
Diagnostics information
Total operation time
ON/OFF cycles
Fan motor speed
Inlet temperature
temperature
Output
Mixing temperature
Air-Fuel ratio rod current
Flow rate
Bypass valve position
Ratio of hot water and cold
water
Error code history: displays
most recent error code
Error code history: displays 2
most recent error code
Error code history: displays 3
most recent error code
Clears memory in error code
history*
N/A
Air-Fuel ratio stage
Exhaust temperature
(520 Indoor only)
Fan motor speed for exhaust
(520 Indoor only)
3-digit 7-seg LED on the
computer board
Mode
Unit information (#1 to #4)
#**
d1 0 to 999 (×100 hours)
d2 0 to 999 (×1000 cycles)
d3 0 to 999 (×10 rpm)
d4
32 to 212 (˚F).
d5 Over 212˚F=E5,
under 32˚F=E0
d6
d7 0 to 999 (×0.1μA)
d8 0.0 to 99.9 GPM
0 to 999 (×10)
d9
Fully closed position=0
d10
0 to 999
Error code history: displays
d11
most recent error code
nd
Error code history: displays
d12
nd
2 most recent error code
rd
Error code history: displays
d13
rd
3 most recent error code
Clears memory in error code
d14
history*
d15 N/A
0 to 16,
d16
normal condition=6
32 to 212 (˚F).
Over 212˚F=E5,
d17
under 32˚F=E0
d18 0 to 999 (×10 rpm)
520 Indoor / 520 Outdoor Service Manual
Remote controller (9007603005)
Mode
#**
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
58
CONFIDENTIAL
Ver. 1.00
Unit information (#1 to #4)
0 to 9,999 (×10 hours)
0 to 9,999 (×100 cycles)
0 to 9,999
32 to 212 (˚F).
Over 212˚F=E5,
under 32˚F=E0
0 to 999 (×0.1μA)
0 to 9,999 (×10 GPM)
0 to 9,999
Fully closed position=0
0 to 999
Error code history: displays
most recent error code
Error code history: displays 2
most recent error code
Error code history: displays 3
most recent error code
Clears memory in error code
history*
N/A
0 to 16,
normal condition=6
32 to 212 (˚F).
Over 212˚F=E5,
under 32˚F=E0
0 to 9,999
nd
rd