Nordyne Gas Furnace: G51MP
Re: Furnace Lockout Codes
Furnace Control Board Fault Conditions | ||
DS1 (Red or Green) |
DS2 (Green) |
Description |
Simultaneous Slow Flash | Power On - No Call For Heat | |
Simultaneous Fast Flash | Normal Operation - Call For Heat | |
Slow Flash | On | Primary or secondary limit switch open. Limit must close within 3 minutes or unit goes into 1−hour Watchguard. |
Off | Slow Flash | Pressure Switch Fault: Open with inducer on or Closed with inducer off. |
Alternating Slow Flash | Watchguard −− Burners failed to ignite, limit open longer than 3 minutes, or flame sense lost 5 times in one heating cycle. |
|
Slow Flash | Off | Flame sensed without gas valve energized. |
On | Slow Flash | Rollout switch open. |
On | On |
Control Board Failure or Control Mis-Wired. Check 24V and 115V Wiring Connections. |
Off | On | |
On | Off | |
Fast Flash | Slow Flash | Main power polarity reversed. Switch line and neutral. Improper main ground. |
Slow Flash | Fast Flash | Low flame signal. Check flame sensor. |
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. |