Codes for the 903106 Integrated Control Board

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

Steady ON – Good flame signal
Blinking – Weak flame signal
Steady OFF – No flame signal

Installation Instructions
for G3, G4, G5, G6, M2 & M3 Furnace Models.

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