Surelight Integrated Control Diagnostic Codes - Lennox G50DF(X)?24A?045 Installation Instructions Manual

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SureLight Integrated Control Diagnostic Codes
LED #1
SIMULTANEOUS
SLOW FLASH
SIMULTANEOUS
FAST FLASH
SLOW FLASH
OFF
ALTERNATING
SLOW FLASH
SLOW FLASH
ON
ON
ON
OFF
FAST FLASH
SLOW FLASH
ALTERNATING
FAST FLASH
NOTE − Slow flash rate equals 1 Hz (one flash per second). Fast flash rate equals 3 Hz (three flashes per second).
Drop out = 0.24 microAmps or below.
DIAGNOSTIC CODES
Make sure to Identify LED'S Correctly.
Refer to figure 20 for control board layout.
LED #2
Power on − Normal operation.
SIMULTANEOUS
Also signaled during cooling and continuous fan.
SLOW FLASH
SIMULTANEOUS
Normal operation − signaled when heating demand initiated at thermostat.
FAST FLASH
Primary or secondary limit switch open. Limit must close within 3 minutes or unit
ON
goes into 1 hour Watchguard.
Pressure switch open or has opened 5 times during a single call for heat;
SLOW FLASH OR: Blocked inlet/exhaust vent;
OR: Pressure switch closed prior to activation of combustion air inducer.
Watchguard −− burners failed to ignite; OR limit open more than 3 minutes;
ALTERNATING
OR lost flame sense 5 times in one heating cycle;
SLOW FLASH
OR pressure switch opened 5 times in one heating cycle.
OFF Flame sensed without gas valve energized.
SLOW FLASH Rollout switch open.
ON
Circuit board failure or control wired incorrectly. Check 24 and 115 volts to board.
OFF
ON
SLOW FLASH Main power polarity reversed. Switch line and neutral.
FAST FLASH Low flame signal. Measures below .31 microAmps. Replace flame sense rod.
The following conditions are sensed during the ignitor warm−up period only:
1) Improper main ground;
2) Broken ignitor; OR: Open ignitor circuit;
ALTERNATING
3) Line voltage below 75 volts.
FAST FLASH
(If voltage lower than 75 volts prior to ignitor warm-up, control will signal waiting on
call from thermostat, and will not respond.
DESCRIPTION
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