Gas dryer coils troubleshooting

Gas dryer coils troubleshooting DEFAULT

How to Test a Gas Dryer Gas Valve Solenoid

On a gas dryer that is shows signs of not heating properly, the source of your issue could be the flame sensor or the gas valve solenoid or coils. On the gas valve in the dryer are several coils that primarily open and close the valve responsible for the flow of gas. If a coil fails, the gas will not turn on and the dryer will not heat properly. Take these steps to test the solenoid.

Step 1 - Power

Be sure to first unplug the dryer’s electricity to avoid electrical shock. Remove the access panel and set it to the side with the screws so they do not get lost during your inspection of the gas valve solenoid.

Step 2 - Adjustments

Select a high heat setting on the dial and then turn it on to observe the flame sensor. Watch as it changes in color. If it glows for several seconds then you will want to replace the gas valve solenoid. If the ignitor glows and stays lit for a longer time, then the problem is going to be found coming from your flame sensor. If it goes out quickly you will want to check your air intake nozzle.

Step 3 - Testing

Test the gas valve solenoid for electrical issues using a multi-tester. Simply set your multi-tester to the ohms setting of X10 and place a probe on each of the terminals. What you are looking for is a change from an infinity reading to roughly ohms. If the device reads either infinity or zero ohms, the coil should be replaced.

Sours: https://www.doityourself.com/stry/how-to-test-a-gas-dryer-gas-valve-solenoid

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While electric dryers have become more and more popular, for those people with gas service in their house the option of having a gas dryer is available.

While a gas dryer is normally considered to be much more economical to operate as compared to an all-electric dryer, there are still a number of causes for your dryer not to heat up.

Below we came up with a list of five of the most common causes why Gas dryers not heating up.

5 Common Causes Why Gas Dryer Not Heating Up

Faulty Gas Valve Solenoid Coils

In a typical gas dryer, the gas is allowed to enter the dryer through the gas valve. To ensure that the gas enters the dryer at the correct time the valve is directed to open by use of an electrical solenoid.

The electrical solenoid is actuated when the dryer is started. If the gas valve does not open shortly after the dryer is started one or more of the coils are not working.

The coils of the gas valve are located on top of the valve and can be tested using a multimeter.

If while testing the coils there is no continuity according to the multimeter.

Testing the coils is really easy after you gain access to the area where the gas valve is located.

Be sure to unplug the dryer and disconnect the gas hose.

Locate the gas valve and remove the coil(s) and test them using a multimeter, if you get a resistance reading on the meter of ohms, the coil is bad and must be replaced.

You can get replacement coils by contacting the manufacturer and order the necessary number of coils.

After replacing the faulty coils and buttoning everything back up, start the dryer and see if the dryer is working again.

Blown Thermal Fuse

The thermal fuse in a gas dryer is part of its safety features.

The thermal fuse is designed to prevent an overheating condition that could potentially cause a fire.

If the thermal fuse is blown the dryer will heat up again until the fuse has been replaced.

Depending on the model of the gas dryer the thermal fuse will be located near the blower.

The dryer does not heat up it is possible that the thermal fuse could be blown and stopping the dryer from working.

To check to see if the fuse is the cause you can use a multimeter and test it for continuity.

Be sure to unplug the dryer and remove the access panel from the back of the dryer.

Locate the blower housing the remove the thermal fuse.

Using a multimeter check for continuity and if the meter reads zero (infinity) then the fuse is bad and needs to be replaced.

To get a replacement thermal fuse you need to contact the manufacturer to get the proper fuse.

After replacing the fuse and buttoning up the access cover and plugging the dryer back in and turn it on.

If everything operates normally than you are ready to go.

Faulty Igniter

The igniter is a very important part of the dryer and if it does not heat up properly the gas valve will not open to allow the gas to flow.

The igniter is turned on when the dryer is started on and if the tip of the igniter does not reach the proper temperature quick enough the solenoid(s) will not open the valve and allow the gas to flow.

If you suspect the igniter is faulty you can test it with a multimeter and check it for continuity.

Before you get started with this repair move the dryer and disconnect both the power cord and gas hose from the back of the dryer.

Remove the back access panel and locate where the igniter is located and disconnect it.

Using a multimeter, check for continuity and if it is bad you will need to replace. Contact the local part store or you can purchase a new igniter here.

Install the new igniter and button up the access panel and reconnect the gas hose and plug in the power cord. Test the dryer to ensure that it starts heating like it is supposed to.

Defective Radiant Flame Sensor

The radiant flame sensor in a gas dryer is very important since it is how the gas valve knows when to open and allow the gas to flow so that the igniter can light the flame.

When the sensor determines that the tip of the igniter reaches the proper temperature it signals the solenoids to open the gas valve which allows the gas to flow and it is ignited.

If you suspect that the igniter is heating up and the gas is still not flowing, the radiant flame sensor just might not be working. You can test the sensor using a multimeter and replace it if necessary.

To check the radiant flame sensor you want to be sure that you disconnect the gas hose and unplug the power cord from the outlet.

Remove the back access panel and locate the flame sensor, it should be located near the igniter.

Remove the sensor in order to test it with a multimeter and if it does not read zero you will need to replace it.

To get a new sensor you will need to contact the manufacturer and order a replacement.

After you install the new sensor and button up the access panel, hook up the gas hose and plug in the power cord test the dryer to see if it heats up.

Faulty High Limit Thermostat

The high limit thermostat is another part of the gas dryer’s safety features. If it detects an overheating condition in the event the exhaust hose becomes obstructed.

If the thermostat activates it will prevent the gas valve from opening and allowing the gas to flow into the dryer.

If you suspect the High Limit Thermostat you can test it with a multimeter and check for continuity. To check the thermostat for proper operation.

Be sure to unplug the power cord from the outlet and open the back access panel.

The High Limit Thermostat should be either located on the blower housing cover or near the exhaust vent. Remove the thermostat and test with a multimeter.

If you do not get a zero reading (infinity) the High Limit Thermostat is faulty and will need to be replaced.

To get a new thermostat you will need to contact the manufacturer of the dryer to buy a new thermostat.

After replacing the thermostat and buttoning up the access panel and plug the power cord back in and test the dryer.

Sours: https://howtofixit.net/why-gas-dryer-not-heating-up-issues-and-solutions/
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Gas Valve Solenoid Coils

M Series Gas Valve

A solenoid is simply an electromagnet. The solenoid coil consists of a loop of wire inside a plastic housing. Through the center of the coil is a tube with an actuator inside. When the coil is powered the magnetic field created moves the internal actuator, opening a passage for gas to flow. When power is removed, the actuator returns to its 'home' position closing the passageway and stopping gas flow.

Should the wire the solenoid consists of break, no magnetic field can be created and thus the gas valve will not operate. Sometimes however that breakage only occurs with use. The coil can heat when powered. As it heats the internal metal wire expands. If there is a break in that wire, the heat can cause the gap to expand and open the electrical circuit which stops gas flow. Sometimes that separation will close again once cool to allow the coil to function again for a short period until the failure repeats.

K and M Series Gas Valves

The solenoid coils of gas valve assembly are easily serviceable however replacement coils for the older "K" series valve may be hard to find these days. Most current model dryers use the more compact "M" serial gas valve. The coils for the "M" series valve are sometimes sold individually or together in a set. The coils from any of the manufactures should be equivalent to each other and interchangeable as they all come from the gas valve manufacturer White Rodgers.



M Series Gas Valve Coils



If the solenoid coils of your "M Serial" gas valve fail or are intermittent, the Whirlpool solenoid kit part number is often the most cost effective replacement. However, if you want to use the OEM replacement parts, here are links to the General Electric (part number WE04X) and Frigidaire (part number ) equivalents.

K Series Gas Valve Coils




If you need coils for an older "K Series" dryer gas valve, use the model number to look up if the correct replacement parts are still available.






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Dryer gas valve and burner operation

How to Check the Gas Valve Coils

A gas dryer blows air through a burner assembly to heat the air. The burner assembly consists essentially of a gas valve, ignitor and a flame sensor. If any part of the burner assembly malfunctions, the result will be low or no heat and slow drying of the clothes.

Caution: Please read our safety information before attempting any testing, maintenance or repairs.

Before testing the gas coils, unplug the clothes dryer or shut off the power at the fuse box or breaker panel to avoid an electrical shock hazard. Turn off the gas line to avoid a possible gas leak. When moving a gas dryer be careful not to damage the gas line.

On the gas valve are one or two coils (solenoids) used to open and close the valve to control the flow of gas. If a coil fails, gas will not flow and the dryer will have no heat.

The easiest way to diagnose a problem in the burner assembly is to observe the burner operation. Remove the small access panel at the bottom, front of the dryer, select a high temperature setting and start the appliance. Watch the burner assembly, shortly after starting the dryer the ignitor should begin to glow. Next you should hear the click of the gas valve coil and a flame should ignite. The flame should be mostly blue and it should remain on for a minute or more.

If the ignitor glows for several seconds (up to 15 seconds) and then goes out, the problem is probably the coils (solenoids). If the ignitor glows and stays on, then the problem is usually the flame sensor. If it ignites and then quickly goes out, it is most likely a problem with inadequate air flow.

Test the coil for resistance using a multitester. Set the multitester to the ohms setting X Place a probe on each terminal. The multitester should change from a reading of infinity to roughly ohms (+/- ohms) when the probes touch the terminals. If the reading is infinity or substantially different from ohms, the solenoid should be replaced.



Sours: http://www.acmehowto.com/howto/appliance/dryer/gdryer/check/gascoil.php

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