Nordyne Downflow Direct Vent Forced Air Gas Oil Furnaces SERIES M1B - Manual (Page 38)

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Figure 44. Gas Direct Ignition Furnace, Heating & A/C Ready - All M1M Models
Steady ON
Control OK
Steady ON
Good Flame Signal
Steady OFF
N
o power
Blinking
Weak Flame Signal
Rapid Flash
False flame or internal control fault
Steady OFF
No Flame Signal
1 Flash
Limit switch is open
2 Flashes
Pressure switch is open with inducer on
3 Flashes
Pressure switch is closed with inducer off
4 Flashes
Lockout due to failed ignition
5 Flashes
115 vac & neutral reversed or no ground
1.
Incoming power must be polarized. Observe color coding. (See furnace data label for electrical information.)
2.
If any of the original wires (as supplied with the appliance) must be replaced, use 105˚C Thermoplastic type wire or its equivalent.
WIRING DIAGRAM