Lennox G51MP Error Codes

Equipment type not specified · Ducted Heating

• DS1 ALTERNATING FAST FLASH, DS2 ALTERNATING FAST FLASH The following conditions are sensed during the ignitor warm-up period only: 1) Improper…
• DS1 ALTERNATING SLOW FLASH, DS2 ALTERNATING SLOW FLASH Watchguard -- Burners failed to ignite, limit open longer than 3 minutes, or flame sense…
• DS1 FAST FLASH, DS2 SLOW FLASH Main power polarity reversed. Switch line and neutral. Improper main ground.
• DS1 OFF, DS2 ON Circuit board failure or control wired incorrectly. Check 24-volt and 115-volt…
• DS1 OFF, DS2 SLOW FLASH Pressure switch open; OR: Blocked inlet/exhaust vent; OR: Condensate line blocked; OR:…
• DS1 ON, DS2 OFF Circuit board failure or control wired incorrectly. Check 24-volt and 115-volt…
• DS1 ON, DS2 ON Circuit board failure or control wired incorrectly. Check 24-volt and 115-volt…
• DS1 ON, DS2 SLOW FLASH Rollout switch open.
• DS1 SIMULTANEOUS FAST FLASH, DS2 SIMULTANEOUS FAST FLASH Normal operation -- Signaled when heating demand initiated at thermostat.
• DS1 SIMULTANEOUS SLOW FLASH, DS2 SIMULTANEOUS SLOW FLASH Power on -- Normal operation. Also signaled during cooling and continuous fan.
• DS1 SLOW FLASH, DS2 FAST FLASH Low flame signal. Check flame sensor.
• DS1 SLOW FLASH, DS2 OFF Flame sensed without gas valve energized.
• DS1 SLOW FLASH, DS2 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.