Our furnace stopped working so we called a repair person. He reset the flame rollout sensor and it worked - through 1 cycle then shut off at the end of the cycle. We replaced the flame rollout sensor. The furnace will work if we go under the house to reset it each time. While we're watching the unit, the sensor trips near the end of the cycle or is the sensor tripping and ending the cycle?
The flame rollout sensor is a rather important safety feature that ideally only trips when there's an overtemperture outside of the combustion chamber. I'd encourage you to get a better quality tech in ASAP to check for a cracked heat exchanger, gas overpressure, restricted airflow (changed the filter lately?), maybe a blocked condensate drain if this is a high efficiency furnace. If the sensor was replaced and it's still tripping, you've got a potentially dangerous overheating issue that you don't want to try to bypass.
Sounds like your burners need to be cleaned, you will need to pull them out and clean the rust out of them. the rust builds up on top of the burners and when you gas valve opens and fills the burners full of gas you will have a roll out of flames. hope that helps.
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The flame rollout switch is located in the burner box on the left side on an upflow model. There are two wires connected to it .between the two connections is a small red button. Depress this until you here a small click. This should reset the switch. These
switches usually open because the flame is "rolling" back instead of being drawn into the furnace.start furnace and check for flame rollout.when the main blower fan comes on if you notice any change in the flame turn furnace off and call a qualified service person as this could indicate a cracked heat exchanger and could cause carbon monoxide to enter the house a potentially dangerous situation. I strongly urge anyone with a gas appliance installed to have a good carbon monoxide(CO) detector installed also. Hope this helps.
1. Thermostat calls for heat.
2. Draft inducer motor starts.
3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes.
4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas.
Solution:You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks.Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. Please see "limits, rollout switches & furnace control boards" further down on this page. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.
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If you have a cracked heat exchanger this will cause the flames to rollout and trip this switch. Its meant to stop the furnace from running and putting carbon monoxide in your home. Watch the furnace as it tries to light if when the gas valve opens and flame is established it should go into the tubes heat the heat exchanger and then your main blower motor will come on. When your main blower comes on is usually when you see the flames rollout and trip that switch. If this happens you can either buy a heat exchanger or new furnace if its a older unit Obama still has that awesome tax credit til 12-31-2010.
Your furnace is off on a safety limit. Look for small thermal disks around the burner area they will have a usually red switch in the center and 2 wires coming into it. Reset this and watch furnace run. These are called rollout switches and they trip when you have flame rollout. SO WATCH IT RUN. If you have flame rollout you will most likely have a cracked heat exchanger if so you will need a new heat exchanger or new furnace. Next the number of flashes is important on some furnaces it will tell you what part is faulty. Count the flashes then on one of the furnace covers is the wiring diagram it will tell you what the flashes mean otherwise you can tell me and Ill help you out, WHen you reset the power on the furnace does it try to heat tell me what all happens when you shut the switch off then back on. when you turnit back on make sure the stat is calling for heat,
with just the information you have provided, i would guess you have a rollout sensor somewhere that has been tripped. there are usually a push button reset on the goodman models. this usually happens when you have flame outside the heat exchanger and is not a good thing. i have seen some goodmans where the wiring for the safety sensors is melted from the flame rolling out due to a crack in the heat exchanger. it this is the case, you need to replace the heat exchanger or consider getting a new furnace. the safety wiring on most goodmans is usually purple. trace all the purlple wiring and see if some of it is melted or if any of the push button switches has tripped. on a high efficiency model, there will be several wires and rollout switches located along the top of the burner box above the burners. good luck. by the way, anytime a safety has been tripped, the fan will default to the on postion as a precaution in case the furnace has got too hot. that may explain the fan running all the time.
Roll out flames are a safety device on a furnace. On the furnace back up under where your burners are located, you will see a switch with a manual reset button on it. What is happening is the flames have rolled out further than they should have at one point during its cycle, and tripped this switch to keep the flames from burning the wiring and what ever it might reach.It is one of many safety's on you're furnace.Reset this switch, like I said, it would be where the flames would come out a little to far. Sometimes they will trip if you get a gust of wind down the flue pipe from the roof. Or, if the burners are getting plugged up with black soot.Check this also.Until the switch is reset, the burners will not come on. You should have no problem finding it, mounted just at the end and above the burners. Walk out side and make sure your flew cap is in place. I have found birds nesting in flew pipes that will cause this.Reset it and watch it for awhile to see how it burns.Don't worry, as that is why the switch is there, for you're safety. I am sorry for such a long solution, but it is called for on this problem. Please let me know how it turns out. Sincerely, Shastalaker7
Heat sensor....Or a flame sensor. Flame sensor is connected to a "single" wire under the buners usually found on the left side. Heat sensors (or flame rollout switches) are found surrounding the burner box. The most common bad one will be located just above the burners. it "should" have a small reset button in the middle just between the two wires. If the furnace does light even for a short time the rollout switch is not bad.
you probably have a cracked heat exchanger which is causing the rollout switches to trip.even the tiniest of cracks will cause the fan to blow the flame back into the unit and cause them to trip. check the heat exchanger for even the tiniest of cracks if so replace it. and be sure to have a carbon monoxide alarm in your home.