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Why does power to furnace needs to be shut off for furnace to work again?

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There's a problem with the ignition sequence. It's most likely a bad flame sensor, assuming a high efficency furnace. I'd replace that first (on my own) before calling a tech in. $20 part versus $250 on site repair bill.

It could also be a bad ignitor (or something else entirely), but I'd stary with the flame sensor. It will get worse, until the furnace won't run at all.

Posted on Dec 15, 2016

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Posted on Jan 02, 2017

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Having problem with lennox furnace Model ML193DF090P48C-02.Furnace has been working but now and getting worse furnace will kick on 20 seconds or so but nothing.Igniter does not come on.When it finally


Usually when your flame sensor gets dirty, the igniter and burner come on for approx.15 seconds, then shuts down. After 3 tries it will lock the furnace out. You have to shut the power off to the furnace then turn it back on to reset it. You need to turn all the power off to the furnace and remove the flame sensor, clean it with some very fine steel wool and put it back in. Be careful not to handle the Sensor (metal) part with your fingers. Turn the power on and set your thermostat so that it will call for Heat. That should fix, it if not you may need a new flame sensor.

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SHUT THE POWER OFF TO THE FURNACE, REMOVE THE THERMOSTAT FROM THE THERMOSTAT SUB BASE TAKE THE WIRE THAT IS ON THE R TERMINAL AND THE WIRE THAT IS ON THE W TERMINAL AND CONNECT THEM. TURN THE POWER BACK ON. IF THE FURNACE COMES ON AND WORKS FINE THEN ITS IN THE THERMOSTAT.

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It sounds like your flue work in your main problem get this fixed first then see how it runs , pipes should run all the way out of the chimney .

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Heater turns on and heats garage to set temperature, than shuts off. when the temperature drops, the unit kicks on again. everything starts working again but only for a few seconds and than shuts off. it...


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


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. 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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2 Answers

Flame sensor dirty


Sandpaper lightly scrubbed over the sensor tip to remove any contamination.

Sometimes cleaning is not enough and the sensor must be replaced.

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1 Answer

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Hint number 1, get HVAC license. One mistake or misunderstanding and you could blow your house up.

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1 Answer

Furnace shuts down, will not start up again


Yeup, sounds like a natural draft. A power vent system vents out the side of the house without a chimney, but because there is no draft of hot air rising up a chimney, a powered fan is used. Power vents have additional sensors that can cause the burner to shut down.

If the burner does fire but then shuts down it sounds like the flame sensing rod is not working. It is dirty or needs replacement. Are there any error codes when the burner shuts down, or an indicator lamp that shows when the controller detects a flame?

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