Page 12
TABLE 5
STATUS CODES
STATUS LED COLOR FUNCTION
DS3
ON / OFF ’
GREEN
DS3−ON indicates that the motor has a demand to operate. (This LED must be on in all
modes).
DS6
CFM"
GREEN
DS6−blinking indicates the airflow (CFM) demand in the motor. The air flow is determine by
counting blinks between two (2) second pauses. One blink equals roughly 100 CFM.
DS7
HI / LO"
YELLOW
DS7−ON indicaties the DS to R" jumper has not been cut. When the jumper is cut the system
will be operating with LENNOX HARMONY II (See Harmony Installation Instructions) or
with the CCB1 Efficiency Plus control.
CCB1: When ON, a 24 VAC is being applied and when OFF, it has been removed. This on/off
operation varies the indoor blower’s performance so dehumidification can be enhanced.
DS8
HEAT"
YELLOW DS8−ON indicates the sytem is in HEAT mode.
TABLE 6
DIAGNOSTIC CODES
Diagnostic LEDs are labeled DS1 and DS2. See figure 4 for location of diagnostic LEDs.
DS1 DS2 DESCRIPTION
SIMULTANEOUS
SLOW FLASH
SIMULTANEOUS
SLOW FLASH
Power on − Normal operation.
Also signaled during cooling and continuous fan.
SIMULTANEOUS
FAST FLASH
SIMULTANEOUS
FAST FLASH
Normal operation − signaled when heating demand initiated at thermostat.
SLOW FLASH ON
Primary, secondary or rollout limit switch open. Limits must close within 3 minutes
or unit goes into 1 hour Watchguard.
OFF SLOW FLASH
Low prove switch open;
OR: Blocked inlet/exhaust vent;
OR: Low prove switch closed prior to activation of combustion air inducer.
OFF FAST FLASH
High prove switch open;
OR: Blocked inlet/exhaust vent;
OR: High prove switch closed prior to activation of combustion air inducer.
ALTERNATING
SLOW FLASH
ALTERNATING
SLOW FLASH
Watchguard −− burners failed to ignite; OR limit open more than 3 minutes;
OR lost flame sense 5 times in one heating cycle;
OR prove switch opened 5 times in one heating cycle.
SLOW FLASH OFF Flame sensed without gas valve energized.
ON
ON
OFF
ON
OFF
ON
Circuit board failure or control wired incorrectly. Check 24 and 115 volts to board.
FAST FLASH SLOW FLASH Main power polarity reversed. Switch line and neutral.
SLOW FLASH FAST FLASH Low flame signal. Measures below 0.23 microAmps. Replace flame sense rod.
ALTERNATING
FAST FLASH
ALTERNATING
FAST FLASH
The following conditions are sensed during the ignitor warm−up period only:
1) Improper main ground;
2) Broken ignitor; OR: Open ignitor circuit;
3) Line voltage below 75 volts.
(If voltage lower than 75 volts prior to ignitor warm-up, control will signal waiting on
call from thermostat, and will not respond.
NOTE − Slow flash rate equals 1 Hz (one flash per second). Fast flash rate equals 3 Hz (three flashes per second).
Low flame sense current = 0.17 − .22 microAmps.
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