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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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SOURCE: Honeywell TH8000 5 wire

7wires? wtf with that! how many things you got runnin there. you need to give way more info to get a decent reply.

Posted on Feb 04, 2008

SOURCE: Honeywell electronic thermostat malfunction for oil heat zone

Try changing the batteries.

Posted on Mar 04, 2008

koolbreezes
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SOURCE: got a honeywell t8400c thermostat

R--- rc or rh y--yellow g---green w--white red is power yellow is cool g--fan white is heat

Posted on Sep 03, 2008

tborn6
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SOURCE: Household Thermostat Replacement

you have to configure the thermostat to run the fan when there is a call for heat. look at the installation instructions and they shoud ask you if it is gas or electric heat if its electric then you are gong to have to configure it to makr e the fan come on with the heat. Good luck

Posted on Jan 25, 2009

tborn6
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SOURCE: Honeywell T87f 3855 Doesn't Activate Heater

thats becaue you need more than this zone working like you said about the master/slave this zone is a slave.

Posted on Jan 25, 2009

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