Re: fan speed setting of my Carrier furnace model...
Most time, you don't have to do anything because the default setting for wiring with fan speed already. if not, trace the motor wires from motor with red , white and black from motor fan to PL2 and PL1. the best is look at a diagram from your actual furnace.
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check the blower motor for seized of burnt out. Fuses blow because of excess current draw and in this case if the fan is not starting everything will stop. The gas will be set so that if the fan is not running the gas will not be allowed to turn on
There is a relay in the outside unit. Check for 24 volts a/c at the two wires coming from the furnace. also there may be a mouse nest in the control comartment where the relay is and they tend to chew up wiring insulation and sometimes wires get disconnected .
Could be a defective thermostat in the plenum.
When a gas furnace shuts down the fan(blower) will run until the plenum cools to the safe range. Usually 1 and 1/2 minutes.
Intermittent operation is a defective thermostat or relay.
It could be the circuit board, relay, heat strip coil or limit. If you have the fan switch at the t-stat in auto and the fan is running constantly it's probably a high temp limit that tripped. Was your filter clean or dirty? If you had a dirty filter and/or A/C coil it will restrict air flow and cause the furnace to overheat.
Remove all power from the furnace, it is likely the brain in the furnace is need of being reset, from the battery replacement, why did you change the battery, was there an indicator telling you to change it?
Many times just removing all the power to the furnace will do the trick with a reset, if not let me know and we will go from there, but it sounds like the main brain is confused or bad, more likely confused, so try the power removed first.
YOU COULD EITHER HAVE A THERMOSTAT PROBLEM OR FAN CONTROL PROBLEM.TURN THE POWER OFF AT THE FURNACE AND TAKE THE THERMOSTAT OFF THE WALL.MAKE SURE YOU MARK THE WIRES SO YOU KNOW HOW TO HOOK IT BACK UP AGAIN.RESTORE POWER TO THE FURNACE.TOUCH THE WIRES THAT WERE HOOKED TO THE R & G TERMINALS ON THE T-STAT TOGETHER AND HOLD THEM THERE.OBSERVE THE OPERATION. WHEN YOU TAKE THEM APART DOES THE BLOWER STOP?TRY IT A FEW TIMES. IF IT CONTINUES TO START AND STOP YOU GOT A BAD T-STAT.JEFF
Your old stat is wired for a traditional thermostat and not a communication stat like the new infinity you have. There is a module plug on the furnace board that will need to be connected to the new thermostat for it to work. The wires that are wired now are from a terminal strip inside the furnace. Please contact your local Carrier dealer. They may be able to get that harness for you