Lennox G43UF Error Codes

Equipment type not specified · Ducted Heating

• ALTERNATING FAST FLASH The following conditions are sensed Improper main ground (control board 32M88) during the…
• ALTERNATING SLOW FLASH Watchguard -- burners failed to ignite OR: limit open more than 3 minutes (control board…
• FAST FLASH, SLOW FLASH Main power polarity reversed. Switch line and neutral.
• OFF, ON Circuit board failure or control wired incorrectly.
• OFF, SLOW FLASH Prove switch open. OR:Blocked inlet/exhaust vent; OR: Prove switch closed prior to…
• ON, OFF Circuit board failure or control wired incorrectly.
• ON, ON Circuit board failure or control wired incorrectly.
• ON, SLOW FLASH Rollout switch open. OR: 12-pin connector improperly attached.
• SIMULTANEOUS FAST FLASH Normal operation - signaled when heating demand initiated at thermostat.
• SIMULTANEOUS SLOW FLASH Power on - Normal operation. Also signaled during cooling and continuous fan.
• SLOW FLASH, FAST FLASH Low flame signal. Measures below Control board 32M88 - 0.18 microamps Control board 78M47…
• SLOW FLASH, OFF Flame sensed without gas valve energized.
• SLOW FLASH, ON Primary or secondary limit switch open. Limit must close within 3 minutes or unit goes…

Reference only. Confirm against the manual for your exact model. Data release 105f66ecb9e96e5dc473025d.