Integrated Control Diagnostic Codes
DIAGNOSTIC CODES
Make sure to Identify LED’S Correctly.
LED #1 (Red)
LED #2 (Green)
DESCRIPTION
SIMULTANEOUS | SIMULTANEOUS | Power on − Normal operation. | |
SLOW FLASH | SLOW FLASH | Also signaled during cooling and continuous fan. | |
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SIMULTANEOUS | SIMULTANEOUS | Normal operation − signaled when heating demand initiated at thermostat. | |
FAST FLASH | FAST FLASH | ||
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SLOW FLASH | ON | Primary or secondary limit switch open. Limit must close within 3 minutes or unit | |
goes into 1 hour Watchguard. | |||
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| Pressure prove switch open. | |
OFF | SLOW FLASH | OR: Blocked inlet/exhaust vent; | |
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| OR: Pressure switch closed prior to activation of combustion air inducer. | |
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ALTERNATING | ALTERNATING | Watchguard 1 hour − burners failed to ignite or lost flame 5 times during single | |
SLOW FLASH | SLOW FLASH | heating demand. | |
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SLOW FLASH | OFF | Flame sensed without gas valve energized. | |
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ON | SLOW FLASH | Rollout switch open. OR: | |
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ON | ON |
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ON | OFF | Circuit board failure or control wired incorrectly. | |
OFF | ON |
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FAST FLASH | SLOW FLASH | Main power polarity reversed. Switch line and neutral. | |
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SLOW FLASH | FAST FLASH | Low flame signal. Measures below 1.5 microamps. Replace flame sense rod. | |
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ALTERNATING | ALTERNATING | Improper main ground. | |
FAST FLASH | FAST FLASH | OR: Line voltage below 90 volts. | |
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NOTE − Slow flash rate equals 1 Hz (one flash per second). Fast flash rate equals 3 Hz (three flashes per second). Minimum flame sense current = 0.5 microAmps.
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