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Wind downdraft trips furnace safety switch - Carrier Air Conditioners

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Raise the chimney.

Posted on Dec 16, 2008

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Could a limiter circuit interupt the transformer from getting 24 volts to open the furnace valve?


Transformers typically supply 24v to the circut board, controls, and safety switches. 120v supplies the fan motor. limit switch is a safety switch and is part of the startup/ignition sequence. If the limit switch is tripped then there is a problem with your furnace that should be managed by a qualified professional in your area, or risk damaging your furnace, and perhaps causing a fire. Hope this clears things up.

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not sure exactly what you have or what button you are pressing but if you have a gas fired furnace and you are pressing the little buttons inside the furnace to get it to run, then you should stop doing that and have a pro come out and inspect it. Furnaces have limits inside them that will trip when they get to hot. In the case of a gas fired furnace a cracked heat exchanger can allow the flame to come outside the firebox, which will trip the limit which is a safety device. Limits only trip if something is wrong. They do not operate in normal operation. A cracked heat exchanger will allow carbon monoxide in the house which can kill you. That is why limits are installed to protect you. if your furnace is over 10 years old this could be the case.

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assume you mean roll-out switch on a furnace....it is a temperature sensitive safety control intended to limit the temperature in the vestabule or burner area. if it keeps tripping, it's because something is causing the temp to get too high. a dirty filter would be first suspect. it could also be an inoperative blower, a dirty evaporator, or a blocked flue or vent pipe. check all these things out and you will likely find your problem..

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Have a carrier 92 furnace. electric motor will not kick on...just hums. red light on circuit board flashes...help?


see this causes and fix it. God bless you
If the furnace won't run, check the electrical service panel for a blown fuse or tripped breaker. Also make sure the power switch on or near the furnace is turned on. Check the unit for a reset button and try it. Some units have a built-in breaker or fuse panel.
However you can have a missing 1 phase , test with the VOM, for to measure voltage. Or motor need repair for winding trouble,bearing.If you do not have enough experience call some electrician.
God bless you

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Ruud 90+ Model UGRA 10EZAJS Trips Out


Check for condensation buildup in the Induction Blower housing. The condensate tubes or canister may be blocked and causing the diaphragm switch to trip the unit out causing the burners to shut down.

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1 Answer

Coleman model #TG8S080B12MP11A has a code of 7-Ignition lockout?


Hi, with the ignition locked out, you need to go through the sequence of operation on this furnace to find out why its locked out. The chart that's glued to the panel will walk you through the steps to take to find out what safety has failed. Check to see that the HSI ( Hot surface ignitor ) glows. Check the flame sensor that runs along side of the pilot to make sure it is clean. You can use a piece of sanding cloth to clean the tip. Check to see that your roll-out switch has not tripped, if so reset it and find out why it tripped, gust of wind down the flue pipe, flue pipe cover missing from the wind maybe, I don't have the schematic of your furnace but your chart will lead you in the right direction to find the problem. You can also at no charge to you, call your local gas company and just say you think you smell gas and they will be there fast. I have had many people do this and have the problem taken care of for no charge, or told what they can do. Look at the schematic and locate the ignitor and follow from there through the safetys on this furnace to find out why its locked out. The inducer motor should come on first to pressurize the fire box. From there you have a small pressure switch, single pole single throw 24 volt switch that must close before the pilot will light and prove its self. If this doesn't happen, the ignition will lock out after 3 times. Kill the power to reset the unit and turn up the thermostat and watch. If for some reason you loose power when you remove the panel, there will be a panel switch that opens and you will need to tape it closed to get power back on. It is a safety also, located on the panel perimeter. Do these checks and get back to me when you can to update me. Good Luck,
Shastalaker7
A/C, & Heating Contractor

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1 Answer

Gas Furnace not working trips breaker


Does it trip the breaker when the safety switch is NOT pressed? I am trying to isolate where to look for the short circuit. Is it before the furnace, or after the furnace. If the breaker trips with the safety switch not depressed, the problem is not the furnace, and could be where power enters the furnace, or further upstream from the furnace.

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Hi and welcome to Fixya. I believe that the wind is affecting the draft. What I would recommend is to install a cap on the flue that is similar to a weather vane in that it rotates to block the wind from creating a downdraft in the flue. Some times depending on the direction and strength of the wind it will come up over the roof peak and then down the flue. A regular fixed cap may work too. You should be able to purchase one at your local hardware store. Please let me know if this was helpful. Good luck.

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Problems with Furnace


On is just the blower fan nothing else, check to see if there is a reset button in the tstat or tripped over load inside the furnace, inside the furance is some safetys, you will see wires runing from each other and finaly to the gas valve, push each untill one of them clicks,then your furnace should start back working, but I would still have someone come out and check why it tripped, because as I said it is a safety, and when it tripps it is for a reason.

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