Original message
| jordaninspectio
 |  "Bryant furnace control board"
, posted Wed 27 Aug 13:24  
I tried to help a neighbor who had trouble installing a new thermostat. He didn’t turn off the power to the system and short circuited the wiring in the process. Then of course nothing worked. The system is a Bryant forced air heater in the attic with a split a/c system with the compressor outside the house. The Forced air unit is a Bryant model number 310JAV048090 made in 2003. I found the 3 amp fuse on the control board blown and after rewiring the thermostat correctly and replacing the fuse powered the system back up. The heater works, but the A/C does not. I can go out side and push the contacts on the outside A/C unit and it runs fine. There is 28 volts coming out of the control board in a few locations and trying to put the system in to test doesn’t seem to work. The fan will not come on manually only with the heater on. There doesn’t seem to be any low voltage power on the cooling side or the fan. I tried jumping from the common 24v to Y, is that a correct thing to do? Nothing happens. Do I need a new control board or does the blowing of the fuse protect it from damage?
Jordan Inspection
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Replies:
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| theduke03
| "Re(1):Bryant furnace control board" , posted Wed 27 Aug 16:57
Is there a jumper from RC to RH on the thermostat?
"My dad was the most feared furnace fighter in Northern Indiana."
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| | jordaninspectio
| "Re(2):Bryant furnace control board" , posted Wed 27 Aug 18:47
No, I think the instructions said to remove it for a five wire system. It was not installed when I showed up to the house.
Jordan Inspection
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| | theduke03
| "Re(3):Bryant furnace control board" , posted Wed 27 Aug 18:54
Are there separate wires on RC and RH? What type of heat is that?
"My dad was the most feared furnace fighter in Northern Indiana."
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