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Replaced a sv9541 with a sv9641. Gas continuously runs through the ignitor assembly, have to turn the gas off to the furnace to stop it. Works fine when furnace is running, just won't shut off when th

Gas won't shut off

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If the gas valve is reversed the gas will flow freely. Make sure it is facing the right direction. If that is good then I would check for power to the valve. If it is energized constantly then it will flow freely. My best guess is there was a wire misplaced and your pilot is energized. Check the wiring diagram and trace the wires to. Confirm.

Posted on Apr 13, 2014

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Posted on Jan 02, 2017

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SOURCE: My gas furnace kicks on but does not blow out how do I fix that?

Belt could be broke or blower motor could be bad thats what was wrong with mine

Posted on Mar 07, 2014

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Gas does not ignite on furnace. Fan stays on even when shut off at thermostat. When trying to start, I hear a click and get a gas odor that stops quickly. Furnace had major overhaul 10 years ago.


You have a ignitor problem .Replace the ignitor .Is it a direct spark or a glow type .My guess it's a glow type .About the fan issue sometimes fan would stay running for maybe a minute even after you turn the fan mode ofg

May 27, 2017 | Heating & Cooling

1 Answer

I have a 10 year old honeywell furnace controlled by a SV9541 smart valve. We finally had to switch to heat but no heat. Tried restarting - system does nothing. Checked to make sure the gas line is open...


Sounds like the Ignitor unplug the ignitor check for continuity if no continuity replace Ignitor or you can usually see the crackon the Ignitor with white residue.

Sep 18, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

I have a Trane gas furnace with White Rodgers 50A50-474 board is flashing a 2 flash code which is a system lockout-no flame/Check line polarity message. The furnace blower contines to run, but the gas...


Sounds like your ignitor is bad, not lighting the gas. If this happens 3x, then controler goes into lockout and induced draft motor continues to run to extract the gas fumes as a safety.
Either replace the HSI (Hot Surface Ignitor) or sand down the end of the electronic spark ignitor and it's ground rod (they work like an exposed spark plug) to remove the carbon buildup on it so it can spark again. All with the power off, of course!
If you need more help, please ask, I'm glad to help! 25 year HVAC service Tech- residential & commercial systems.

Apr 05, 2013 | Heating & Cooling

1 Answer

Furnace was working fine and just stopped working...it reacts to raising the thermostat but doesnt actually flame on


This is probably a ignitor.


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.
Please leave feedback... Thanks...

Jan 28, 2011 | Goodman GMS90703BXA Heater

1 Answer

It does not fire at all times igniter works, I can hear the gas valve when opens, some times it fires for a minute and some times does not fire at all


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.

Dec 07, 2010 | Heating & Cooling

1 Answer

Hot surface ignitor won't ignite,I replaced the igniter and it still won't.


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.

Oct 25, 2010 | Heating & Cooling

1 Answer

Looking for information on a Kenmore gas dryer 70 series, model #77732791


The gas assembly is accessed by droping the kickplate/bottom panel. If the fuse mounted by the control klixon onthe blower housing has continuity then the control klixon will send power to the gas assembly when the drum temp drops below 105f. The thermostat/klixon will allow the power to remain on till the drum temp reaches around 160f. Then it will open and shut down the gas assembly and the drum continues to rotate untill the air drops below 105f and again the gas assembly gets power. When power is applied to the gas assembly it goes through the flame sensor to the ignitor and solenoid/coils. The ignitor draws so much power it is imposible for those solenoid/coils to open and discharge gas so when the flame sensor detects 1800f from the ignitor it kills power to the ignitor and that gives power to those coils. The gas comes out and hits the screaming hot ignitor. and whoosh you have fire. The fire only remains on till the temp reaches 160f and that does not take all that long. The constant cycling insures even heating so what can go wrong on this beast? Any component I just mentioned that is open (no continuity ) will be the problem. Now if the gas dryer works but then quits and works some more then replace those operator solenoid/coils. They can become intermittant with age.

Jan 18, 2010 | Dryers

1 Answer

Maytag Gas Dryer SDG515DAWW - heating stopped


The heat is regulated with a Klixon mounted next to the blower housing near the vent pipe so it can judge the temperature of the air coming out of the drum.Right next to it is a melting type fuse. If the dryer runs and gets too hot the fuse will melt.But the dryer will still run. So if the fuse is good(continuity) and the dryer control(cycle) thermostat is also good then you should have power going to the gas valve assembly when the machine is running unless the timer is in the no heat or wrinkle free/cool down mode. When the gas valve assembly is energized the flame sensor a%20flame%20sensor%202.bmp flame sensor mounted outside the burner chamber detects the heat from the ignitor. When the heat is very intense then the sensor shuts down the igniter
a%20igniter.jpg Igniter and that frees up the power so that the coils can be fully energised and open the gas gates. The gas comes out and hits the red hot igniter and you have ignition. It stays on for maybe 2 or 3 minutes or until the control thermostat is satisfied and shuts down power to the gas valve assembly.

Jan 03, 2009 | Dryers

1 Answer

GE gas dryer, no heat, new ignitor


Hi!! make sure that you have 120 volts going to the glow ignitor.the gas valve will not turn on the gas if the ignitoe wont glow..if it glows the check yout coil boosters they are round and are located by the gas valve.then if not you have a bad timer.they are usually round and are black..good luck..

Jan 03, 2009 | Dryers

1 Answer

My furnace fires up and runs for about 30 seconds,, then the gas shuts off


First we need to understand what is probably happening by understanding how this unit works.
A flame safety senses a flame and if one is not present it shuts off the gas supply. This safety is incorporated to make sure that if the flame goes out for any reason, it doesn't continue to dump gas into the furnace. Because I have no idea what type of sensors this unit uses, can you explain to me what kind of ignitor it has? See if it has a spark, or a hot surface ignitor. The hot surface ignitor will glow very bright white but looks like it's made of ceramic.

Sep 18, 2008 | Goodman Heating & Cooling

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