Lennox 16B27 Manuallines page 9

Operation
Idle Mode:
Decimal point blinks at 1 Hz
Soft Disabled
Top & Bottom horizontal line and decimal point blink at 1
Hz
OEM Test Mode
Electrical Heating stage
Shows number of currently active electric heat pilot relays.
Cooling Stage
Shows what stage of cooling is currently operating.
Heat Pump Stage
Shows what stage of heat pump is currently operat ing.
Heat pump & electrical heating stage
Shows current heat pump operating stage and number of
active electric heat pilot relays.
Defrost Mode
Shown only while in an active defrost. (Simultaneous Y, W,
and O)
Dehumidification mode
Shows that the unit is providing dehumidification in
stead of straight cooling.
Indoor Blower only (G demand)
Shows the current CFM delivery of the main blower in
actual CFM.
Diagnostic recall
Shows the last 10 stored diagnostic error codes. Ini tiated
by a 2-second button press. Button press inter rupts the
current display pattern. After all codes are displayed,
current display status will resume opera tion.
Fault Memory clear
Active Error in AHC Idle mode
Shown all active error(s) codes
Active Error in Run Mode
Shown current status and all active error(s) codes
Discharge Air Temperature Sensor (DATS)
Any time DAT is sensed in operating range value is dis-
played if indoor blower is running.
Soft Disable
Table 7. Seven-Segment Status Display
Description
Decimal point blinks at 1 Hz (0.5 second on, 0.5 second off). Display OFF.
Top & Bottom horizontal line and decimal point blink at 1 Hz (0.5 second on, 0.5 sec-
ond off). See additional information below this table.
All segments flashing at 2 Hz (unless error is detected)
Following string is repeated if one stage Heat is active with 850 CFM:
H 1 pause A 8 5 0 pause
Following string is repeated if second stage cooling is active with 1235 CFM:
C 2 pause A 1 2 3 5 pause
Following string is repeated if first stage heat pump is active with 925 CFM and no
Electri cal Heat:
h 1 pause H 0 pause A 9 2 5 pause
Following string is repeated if one stage electrical heat and second stage heat pump is
active with 600 CFM:
h 1 pause H 1 pause A 1 6 5 0 pause
Following string is repeated if defrost is active with two electrical heat stages active
and 975 CFM:
d f pause H 2 pause A 9 7 5 pause
Following string is repeated if dehumidification is active with 685 CFM:
d pause A 6 8 5 pause
If indoor blower is providing 1600 CFM: following string is repeated:
A 1 6 0 0 pause
If first error is 250, second 231:
E pause 2 5 0 pause E pause 2 3 1
Next codes (up to 10) are show using same method.
If there is no error codes stored:
E pause 0 0 0
After the fault memory is cleared following string is displayed with 0.5 seconds charac-
ter on/off time:
0 0 0 0 pause
Following string is repeated if Error E125 and E201 are present:
E1 2 5 pause E 2 0 1
Following string is repeated if Error E311 is present while blower aped at 880CFM:
A 8 8 0 pause E 3 1 1
Following string is repeated if three stage el. heat is active with 850 CFM & DAT is
104° F:
H 3 pause A 8 5 0 pause U 1 0 4 pause
Steps to follow if the damper control module is displaying the soft disable code:
1. Confirm proper wiring between all devices (Thermostat, damper control module,
indoor and outdoor)
2. Cycle power to the control that is displaying the soft disable code.
3. Put the room thermostat through Set Up.
4. Go to setup / system devices / thermostat / edit / push reset.
5. Go to setup / system devices / thermostat / edit / push resetAll.
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