After reviewing this, I do not think I can do what I am trying to do. I’ll check with you guys first before I give up.

Carrier:
Fan unit: FB4A
Heat Pump: 38YCC
Honeywell T-Stat model ???

I noticed Tuesday that the fan was no longer running in the house though I left in the “on” state. Then I looked at the T-stat and it showed “Heat-on” then “Emg Heat”. The outdoor unit is running, but no heat. What heck?

Upon taking off the covers on the fan unit, I found the relay on the fan control board was partially melted and the insulation on the wires connected to SPT, NC, NO wire were blacked or partially vaporized. Looking further, I found the Yellow and Blue motor wires chafed and charred as well as the unused Red and Black ones. Then I noticed that the fan had been replaced in 2005 and the knuckleheads did not bother to chafe guard the motor wires. The vibration sawed off the insulation on the metal chassis and the relay became a fusible link!

I called the local Carrier supplier and he wouldn’t sell a control board to the general public. In fact, he would not sell you the part unless you were a Carrier Dealer! Thank God for the Internet! I found it and ordered it all for $40 something dollars with shipping. While this puppy is in transit, I thought to jumper out the fan control board to make the unit run to get some heat. I hot wired L1 and L2 to the motor to make it run. I tried wiring Red 24VAC off the transformer to Red and Grey on control wires. It made the thermostat work but would not turn on the compressor. It just flashed “Heat-On”. I turned the thermostat off for I was afraid I would break something.

There is a light Blue wire that goes to the NC contact on the motor relay. It’s not hooked up at the moment. I assume that this is the feed for the 90 second additional runtime on the motor after R-G is broken. My diagram stops at the connector. My assumption is that if I hot wire Red and Grey controls, it will run and never shut off. I think I will have then bypassed the Thermostat controls. What is the flashing “Heat-On” looking for? Did I not wait long enough? Is that how it works and is there a way to make compressor cycle with the fan motor Always-On while I am waiting for the control board?

Thanks for any response in advance.