I had a furnace guy here twice. Each time he replaced parts, each time the furnace stopped working shortly after he left. The blower motor starts, but the furnace won't fire. A friend tried calling Bryant, but they wouldn't say anything until they had the model number. Ihave searched hi and low on the unit, and no number. Suggestions? Parts replaced: Inducer motor, inducer control board, main control board, pilot and flame sensor.
Try checking the pressure sensing switch,it has a tube that should run somewhere close to the inducer fan.sometimes this hose fills with liquids,and makes the units act funny.I don't know if you have a condensing unit or what.the furnace wont try to light if it cant tell the inducer motor is running.any induced draft unit will work this way.you can also do a temp. bypass of the pressure switch to make sure the contacts on it are closing just be sure your inducer fan is running,and you cant leave it like that its just a test.that is a safety feature you really need.
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An intermittent problem can take patience and time. Process of elimination too. If you are unfamiliar with servicing and repairing a gas furnace, you may want to leave that chore to a professional. Now, what exactly is coming back on after the set temp is reached? Blower only or is it firing the furnace also. My experience says it's just the blower. This is caused by... Furnace overheating, then shutting down, then bringing blower on to cool it down. Probably not your scenario. It's possible the control board is acting up. Highly possible that you have a high temp limit with a loose connection, or needs to be replaced. Schematic will call it HS or LS, something like that and it should have 2-6 of em. Possible that the G wire from the t-stat is shorting to R, and bringing the fan on. Try posting more info? Model & serial number. Fan cycling or furnace? Have you checked new t-stat installer configuration? Hope this helps! And work safe
A 13 code means the furnace cycled on limit more than three times consecutively and is in a lockout for 3 hours. A 14 is ignition lockout. An ignitor does not intermittently quit working. I'm the service mgr at our shop, and I know that particular furnace model has a service bulletin out on bad secondary heat exchangers. If your lucky the filter is dirty, or the furnace condensate trap or drain is clogged. Most likely the secondary heat exchanger is plugged up and isn't allowing the pressure switch to make. Or the furnace is overheating due to it not being able to properly vent hot gas. Which would explain the high limit lockouts. Call an authorized carrier dealer so you can take advantage of the free heat exchangers and the $300 labor credit. You can also call an authorized Bryant dealer to perform the work for you. Only an authorized dealer can rectify this problem because the Bryant corp requires testing and paperwork in order to get your free parts and labor credit. Good luck.
Hello my name is Heath it will be my pleasure to assist you. First thing to do is go to the furnace and look in the small peep hole in the lower blower door and see if there is an led light that is flashing a certain number of blinks record the number and look for a diagnostic chart on the inside of the blower door or the upper side panel of the furnace if there is no flash code present you can try resetting the power to the furnace and see if the furnace will fire up.
Hello, Make sure the flame sensor is clean near the burners, The flame sensor is a metal rod that is on the opposite side of the ignitor. To clean the flame sensor you will need some steel wool, turn off power to the furnace and remove the flame sensor and clean it with the steel wool. After cleaning reinstall it and turn power back on to furnace.
theholts220 - Sounds like they needed to install a bit larger transformer . You can also buy a A 50 Sensing relay that attaches to the wires for your motor and when you turn on the furnace it will allow the power to go to the humidistat. Very strange though they do not use a lot of power. Check and make sure the wires are not pinched or touching metal somewhere.
TLuzzo - The humidistat seems to be working when you turn it down. The wires for the solenoid should be hooked up to your furnace circuit board. The instruction manual will tell you where. If you dont have a spot on your circut board the A 50 sensing reley is they way to go. They are inexpensive