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No heat i can hear the switch but the flame does not ignite

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Based on your generic question, I can only provide generic answers that might help you get it going.. First off, are you sure you have gas coming into the dryer? If yes, then when you start a dry cycle... can you see any evidence that the igniter is working( usually an orange glow inside )...If everything appears to be OK.. then you could have a problem with your igniter, over-temp sense switches and on some models.. they have over-temp switches that have a reset button on them ( clever little money maker for the sevice guiys...these dryer manufacturers).. anyway.. those are the most likely candidates that would disable a fire strike and heat. If you could provide specific brand and model number next time.. that would help..

Hope this helps..

Posted on Aug 24, 2008

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Diagram for speed queen model ags17awf


If you hear the click that means the ignitor is working and the flame sensor is working also because you hear the click of the bimetal inside the flame sensor. The sensor kills power to the ignitor and that allows the solenoid coils to open the gas valve. Them solenoid coils get weak with age. They work a little bit when cool the get hot and quit sometimes they simply go on out.
themobilian_3050.jpg

Oct 21, 2011 | Dryers

1 Answer

Dryer starts, but does not heat up. Igniter ignites, but no heat. Gas to rest of house is operable.


Hello,
Thier are 2 possible things causing it not to heat.

1) The flame sensor is bad..if the igniter glows BUT does not go off it will be the FLAME SERSOR that is the problem

2) the coils that open the gas valve are defective..If the igniter DOES go off but no flame it will be the gas valve coils

while i dont know what brand you have their are fairly unuvesal parts for the coils or flame sensor

Part#'s
GAS VALVE COILS 279834

FLAME SENSOR THAT FITS ON RIGHT OF BURNER TUBE WE4X448

FLAME SENSOR THAT FITS ON LEFT OF BURNER TUBE 338906

GENE

Aug 28, 2011 | Dryers

1 Answer

Frigidaire crown gas dryer runs fine but after about 10 minutes it turns itself off and i cant turn it back on for about an hour


From the description you give the most likely cause of this problem are bad gas coils or a bad gas valve.

You say you see the flames for 10 minutes before it stops heating but you don't mention if the igniter is continuing to glow. One thing we need to know is if the igniter continues to cycle on and off when the dryer stops heating.

There is a small square plug on the front panel you can remove to try and visually check if the igniter is glowing.

The problem won't be the thermal fuse or one of the thermostats. Once the fuse is open the dryer won't heat but it won't start to heat after 20 minutes.

After the dryer runs ten minutes and stops heating then check if the igniter is still cycling on and off. This is important because if the igniter is working then the thermostats and igniter are okay.

When the igniter glows at some point you might hear a click and the igniter would stop glowing. The click is from the flame sensor and after the click and the voltage is removed from the igniter at the same instant the voltage is applied to the gas coils and you should get a flame.

You might hear a hum, buzz or vibration from the coils when this happens. If the coils seem to react to the voltage but there is no flame then most likely the gas valve is bad. If the coils don't do anything then most likely the coils are the problem. The gas valve and gas coils can work for 10-15 minutes and then heat up and stop working till everything cools down.

One other thing I must tell you about the gas coils. Here is a link to the gas coils you will need. These are the new style that will last quite a bit longer the the older one. The coils are like the spark plugs in your car. The will need replacing in time due to wear. Below is a video to walk you thru the repair process.


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Jan 09, 2011 | Frigidaire GLGR642A Gas Dryer

2 Answers

The dryer runs but it will not heat up and dry clothes. This is a gas dryer.


Hello

When the dryer wont heat up and dry clothes it means that the thermostat is bad and needs replacement. This part is located on the blower wheel housing inside the duct, please get back to me if you have any other questions.

Kevin

Nov 11, 2010 | Kenmore Dryers

1 Answer

I'm still having the problem with the heat Some times the dryer heats for a minute and sometimes for 3 seconds, i replaced the coils and the hi-limit thermostat .I hear this clicking so i know the ignitor...


The previous problem is addressed by replacing the high-limit thermostat according to your last post. The igniter is definitely working since the gas is being ignited.

Yes there's a flame sensor along with the igniter on the burner cone and it must be not working properly. The cycling thermostat is good as per previous troubleshooting, the high-limit thermostat has been replaced, and the igniter is good. These findings and observations suggest that the flame sensor is not working properly. It is either dislodged from its proper position and cannot sense properly the heat from the flame and the igniter or it is faulty and needs to be replaced.

Check that the flame sensor is aligned properly with the slot on the burner cone. Replace the sensor if it is aligned properly. The sensor looks like this.

Nov 11, 2010 | Dryers

1 Answer

Glgr331ao heats for 5 minutes or more than doesnt heat after that i hear it coming on, igniting.i cleaned the duct out and inside of the unit.i cant check the flame because when you take the front panel...


If you hear the click then the ignitor is working. It would not click otherwise.
The flame sensor is also working because you hear the click. The solenoids are known to get hot and quit with age. Replace them

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Dryer repair

Oct 11, 2010 | Frigidaire GLGR331A Gas Dryer

1 Answer

What to do when dryer runs but does not heat up


Things that could stop a gas dryer from heating:
- glow bar igniter, thermal fuse , coils on the gas valve, gas valve, thermostats, motor heat switch, timer, selector switch, sensor.
Problem -
Gas flame comes on first few times then quits and igniter keeps cycling on and off but never lets the gas go.
Answer ( most common ) -
Replace the coils on the Gas Valve.

Problem -
No flame, no igniter glowing at all,
Answer ( most common ) -
Inspect igniter for small burnt spot on dark gray or black part of igniter or check for 110 volts to igniter when dryer should be calling for heat.

Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Aug 10, 2010 | Whirlpool LGR5636L Gas Dryer

2 Answers

The heat turns off after 3 seconds of flame.


There is a flame sensor failure.

Here is the ignition sequence for a furnace. This will help you understand what is happening/not happening.

Thermostat2.gif calls for heat.

draft inducer motor (DIM) starts drawing draft through heat exchanger.

Pressure switch detects proper operation of DIM, and sends signal to board to begin ignition.
(it detects negative pressure)

Ignitor starts ignition attempt and gas valve sends gas to burners.

Upon ignition, flame sensor detects flame and sends signal to board stopping ignition sequence and continuing gas flow for heat mode operation until thermostat is satisfied.

During this sequence the blower motor is brought on, and by using a series of temperature limit switches, the system assures that the unit is operating properly.
(If the blower is not operating, or the airflow is inadequate, the heat exchanger will overheat and trip one or more temp limit switches.)

There is also a "rollout" switch that detects improper flame pattern "rolling out" into the controls compartment.

Now, to apply that to your situation.

If the flame sensor does not sense flame, it shuts down the furnace to prevent a dangerouse gas build up.

With most modern glow coil ignition systems you have one of two failures.

1) the flame sensor is bad and needs to be replaced.

2) the control board is not proccesing the signal from the flame sensor and shuts the system down. In that case the board would need to be replaced.

There is a possibility that a temperature limit or roll out switch is breaking the curcuit, but that would be quite unusual to happen consistantly at three seconds.

Unless you have the ability and tools to test the snesor and board, the next step would be to replace the sensor first, and then the board if that does not fix it.

Oct 03, 2009 | Maytag Neptune MDG5500AW Gas Dryer

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