Integrated Control Board M2 And M3 Furnace

Integrated Control Board M2 and M3 Furnace 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 open with inducer on
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