Troubleshooting; Outlet Air Pressure Switch (Oaps); Intake Air Pressure Switch (Iaps) - A.O. Smith 100 Series Installation And Operating Manual

SERVICE MODE
To enter in the service mode, unlock the buttons by simultaneously
pressing the "Lock/Unlock" and "Minus" buttons for 3 seconds. In
service mode, the "service" icon shows on the display.
While in service mode, pressing the "Plus/Minus" (SW3 & SW4)
buttons cycles between service codes. The numeric display shows
the service code for 1 second, followed by the actual measurement,
which is displayed for 3 seconds.
Service Code
H01 SW code / SW revision
H02 Tank temperature
H03 Tank temperature 2
H04 Flame current
H05 Blower rpm (actual)
H06 Blower rpm (commanded)
H07 LDM Voltage
H08 Total Heating cycles
H09 Total heating time
H10 Total Ignition failures
H11 Total Flame loss failures
H12 Error code History 1
H13 Error code History 2
H14 Error code History 3
H15 Error code history 4
H16 Error code History 5
H17 Error code History 6
H18 Error code History 7
H19 Error code History 8
H20 Error code History 9
H21 Error code History 10

OUTLET AIR PRESSURE SWITCH (OAPS)

The role of the OAPS is to detect a blocked flue outlet (blocked
vent). It is a normally closed switch that opens when the outlet vent
is partially or totally blocked. In case it opens, the heater ceases
heating mode, goes to post-purge and displays E06. Once the post-
purge is over, if heat request is still present and the OAPS is closed,
the system should restart and attempt to start a new heating cycle.
If the OAPS opens three times in less than 60 minutes since first
occurrence the heater ceases heating mode, goes to post-purge,
and displays E05. See Error Codes (page 50).

TROUBLESHOOTING

TROUBLESHOOTING
Table 22. Service Code Functions
Service Functions
Example:
H06-5.00 is the service code for "H06 Blower RPM target," and
"5.00" is the blower speed (5.00 x 1000 = 5,000 rpm).
The display continues to show the service code and the measurement
value unless the up or down arrow button is pressed to switch to
the next item.
To exit service mode, simultaneously press the "Lock/Unlock" (SW2)
and "Minus" (SW4) buttons again for 3 seconds. Also, if in service
mode and no button is pressed for 30 seconds, the unit will go back
to operation mode, with the setpoint on the display and the buttons
locked.
Range
0-999 °C /°F
0-999 °C /°F
0-9.9
1.00-9.99 (x1000) rpm
1.00-9.99 (x1000) rpm
0.00-9.99
0-999999
0-999999
0-999999
0-999999
-
-
-
-
-
-
-
-
-

INTAKE AIR PRESSURE SWITCH (IAPS)

The role of the IAPS is to detect a blocked air inlet. It's a normally
closed switch that opens when the inlet vent is partially or totally
blocked. In case it opens, the heater ceases heating mode, goes to
post-purge and displays E23. Once the post-purge is over, if heat
request is still present and the IAPS is closed, the system should
restart and attempt to start a new heating cycle. If the IAPS opens
three times in less than 60 minutes since first occurrence the heater
ceases heating mode, goes to post-purge and displays E22. See
Error Codes (page 50).
48
Unit On LCD
H01_xxx_xxx
H02_xxx
H03_xxx
uA H04_xx
H05_xxx
H06_xxx
V H07_xxx
- H08_xxx_xxx
h H09_xxx_xxx
- H10_xxx_xxx
- H11_xxx_xxx
- H12_xxx_xxx
- H13_xxx_xxx
- H14_xxx_xxx
- H15_xxx_xxx
- H16_xxx_xxx
- H17_xxx_xxx
- H18_xxx_xxx
- H19_xxx_xxx
- H20_xxx_xxx
- H21_xxx_xxx