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Furnace fires but cuts out after 10 seconds. Yellow lite flashing 2 times continuous. Green light flickers and sfter furnace cuts out gos bright green for 2 seconds and then goes back to flickering.

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  • 396 Answers

Since you didnt include Brand and Model number, you could check on the inside of'
the front panel you take off to access the furnace. Most have a diagram of the wiring
and will have an Problem Code list that tells you what those flashing lights indicate.
Good luck and feel free to reply with Brand and Model #

Posted on Mar 31, 2011

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My Xenon high efficiency furnace has a red blinking led light that blinks 4 times and my furnace will not light. What could be the problem?


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www.grayfurnaceman.com/-ifc-failure-codes.html
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7 Tips and Tricks to repair your Furnace DIY - YouTube

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I did not see that your indoor fan motor started. Near your indoor fan motor there is a temperature switch that is called the fan delay relay. On a temperature rise the relay shuts a contact that turns on the indoor fan motor. If the contact does not close the high temperature limit will shut the gas controls off like your getting. A fan delay relay also allows the fan to run a minute or so to carry away the remaining heat in the furnace and help cool the furnace down. The fan delay relay is normally mounted in a recessed area in the fire wall of the furnace plate. I have also seen them on the top of the furnace heat exchanger. Anyway, the fan delay relay will probably not be available on a sunday, so temporarily until parts are available, try turning the thermostat fan from auto to on and try the furnace again. By turning on the fan to on the high temp limit will not shut you down again.

I have had high temp limit change there trip points, but you said you bypassed it and did the same thing.

Another cause could be using the wrong type of air filter. The new pleated filters sold block to much air flow. If air mass flow rate drops the difference in temperatur go up and when the difference in temperature go up, it gets nearer the high limit and causes it to trip. All pleated filters drop normal air flow through ducts by at least 35%. To make your air duct system work properly use the what is called throw away filters which cost about 1/3 the cost of the pleated filter. Remember to either clean or change the throw away filter monthly to reduce dirt being drawn into your duct system.
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I can't tell by the picture your showing if it's a mid efficiency or the pilot stand by if it's mid efficiency furnace then there's a reset button if the other it sounds like your high and low limit switches are not in sink to each other ,should be able to find out how to set on the internet if not that then check your thermostat

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If your green light flashes a normal 1 second flash continuously, it means your furnace has a normal heartbeat. If your green lite flashes so many times then stops and then flashes that many times again, then stops again, and repeats again, count the number of flashes, write down that number, then remove the fan door the schematic will tell you the trouble. If your furnace has a normal heartbeat, the thermostat or wiring from the thermostat to the furnace is opoen or faulty.

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Might be the pressure switch. If it gets blocked with dirt will not let furnace fire

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It sounds like you're describing one of two things. The hot surface ignitor in a gas-fired furnace, or the resistive heat strips in an electric furnace.

The hot surface ignitor in a gas-fired furnace lights the burners. This ignitor in modern furnaces serves the same purpose as the standing pilot flame did in older furnaces. It provides the required heat to ignite the gas at the burners. Without an ignition source, a gas-fired furnace cannot provide heat. When the ignitor is activated it will glow bright orange or yellow.

The resistive heat strips in an electric furnace actually provide the heat to a home or building. When the furnace turns on, the heat strips are activated and usually glow orange when they reach peak temperature. In almost all cases, the heat strips are not easily seen or accessed without removing covers or panels inside the furnace.

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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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