903106 Nordyne Integrated control board OEM 1 year Warranty

Nordyne circuit board for M2 and M3 series of furnaces. Also used in G3, G4, G5 & G6 units. For a spare or replacement fuse, order 3A fuse 

Replaces 624538, 6245380, 624557, 6245570, 624564, 6245640, 624-5640, 624591, 6245910, 624628, 6246280, 624631, 624631A, 624631-A, 624631B, 624631-B, 6246310, 902378, 902696 & 902896.

CONTROL LIGHT STATUS
RED
Steady ON Control OK
Steady OFF No power
Rapid Flash - False flame or gas valve relay shorted
1 Flash - Limit circuit open or external load on "W" (does not apply to deck switch, see below) .
2 Flashes - Pressure switch is stuck open with inducer blower running.
3 Flashes - Pressure switch is closed with inducer off
4 Flashes - Ignition failure (check ground)
5 Flashes 115 vac & neutral reversed or no ground

YELLOW
Steady ON - Good flame signal
Blinking - Weak flame signal
Steady OFF - No flame signal