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Home > Forums > Engineering Forums by Industry > Commercial Products > Appliance & small electrical machine engineering Forum

how to identify component needing replacement

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paulmars (Mechanical)

13 May 10 11:45

honeywell central AC/heat Electronic fan timer st9103a 1036. Honeywell is no help. They want me to buy a new board for 150$. I believe its the IC on the board that's bad. I have not been able to find a schematic of this board. The IC is labeled:
L 9948
814
(large dot) Y

I've tried a few on line part suppliers and they cant identify it. It has four pins.

Home was hit by lightning and it fried 3 items on 3 different house circuits One was the AC. The above board is telling the fan and the heater to turn of, even though the thermostat is off. I've troubleshooted and believe its this IC and want to replace it.

Can anyone help me finding the original manufacturer?

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