Question about Whirlpool LGR5644J Gas Dryer

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Whirlpool Gas Dryer

The gas dryer tumbles but does not heat. With the gas off and the power disconnected, I read resistance on the fuse, high limit switches, coils, & igniter. I do not read resistance(0 Ohms) on the flame sensor. Could this be the problem. Plase advise. Thanks for your help.

Posted by Edmond Libsch on

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Tracy Farrell

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Yes, that is most likely the problem. Once the glow bar igniter glows so hot, the switch opens & drops power to the igniter.(The radiant sensor has continuity while cold & open when a flame is present.) At the same time, by opening it redirects power to the valve coils allowing them to open & gas flow to the burner assembly. The dying glow of the igniter fires the gas. However, if your igniter glows, the radiant sensor is good. In this case, you'd need to replace the gas valve solenoids.

Posted on Aug 01, 2007

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I have a Kenmore dryer. Model number 110.64832400. It runs, but no heat. There is no restriction in the duct, I have it removed. All of the switches have continuity and read 0 ohms. Replaced the...


check both high limit t-stat and thermal fuse located on the heater box. both high limit at bottom left on heater and fuse on upper left sould have ohm readings if in good shape..
PLEASE DISCONNECT POWER BEFORE TESTING!!! if one fails continuity replace both and MAKE SURE the venting tube is clear to the exterior of the house.

Dec 15, 2017 | Dryers

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Whirlpool Dryer Various Test Procedures - Part 2


TEST #4 Heater
This test is performed when either of the following situations occur: Dryer does not heat Heat will not shut off
This test checks the components making up the heating circuit. The following items are part of this system:
Harness/connection, Heater relay, Thermal cut-off, Thermal fuse, High limit thermostat, Gas burner assembly,
Centrifugal switch, Exhaust thermistor, Machine control electronics, Gas supply. Dryer does not heat:
1. Unplug dryer or disconnect power.
2. Remove the back panel to access the thermal components.
3. Perform TEST #4b. If the thermal fuse is OK, go to step 4.
4. Perform TEST #4c. If the thermal cut-off is OK, go to step 5.
5. Locate the high limit thermostat. Measure the continuity through it by connecting the meter probes on the
red wire and blue wire terminals. If there is an open circuit, replace the high limit thermostat and thermal cutoff.
Otherwise, go to step 6.
6. Perform TEST #4d. If this is OK, replace the machine control electronics.
Heat will not shut off:
1. Unplug dryer or disconnect power.
2. Access the machine control electronics, remove the P14 connector, then measure the resistance between P14-3 (red-white wire) and P14-6 (red-white wire) at the connector. If 5–15 k ohms are measured, replace the machine control electronics. If the resistance is greater than 20 k ohms, replace the exhaust thermistor.
TEST #4a Exhaust Thermistor
The machine control electronics monitors the exhaust temperature using the exhaust thermistor, and cycles the heater relay on and off to maintain the desired temperature. Begin with an empty dryer and a clean lint screen.
1. Plug in dryer or reconnect power.
2. Start the Timed Dry cycle.
3. If after 60 seconds, F-22 or F-23 flashes in the display and the dryer shuts off, the thermistor or wire harness is either open or shorted. Unplug dryer or disconnect power. Check wire connections at the machine control electronics and thermistor. If wire connections are OK, check exhaust thermistor resistance per step 5.
4. If F-22 or F-23 does not flash in the display, the connections to the thermistor are good. Therefore, check the exhaust temperature value at any or all of the temperature levels in question, using the Timed Dry cycle, and the following process: Hold a glass bulb thermometer capable of reading from 90° to 180°F (32° to 82°C)
in the center of the exhaust outlet. The correct exhaust temperatures are as follows:
TEMP
SETTING HEAT TURNS
OFF* HEAT TURNS
ON High 155° ± 5°F
(68°± 3°C) 10–15°F
(6–8°C)
below the
heat turn off
temperature Medium 140° ± 5°F
(60°± 3°C) 10–15°F
(6–8°C)
below the
heat turn off
temperature Low 125° ± 5°F
(52°± 3°C) 10–15°F
(6–8°C)
below the
heat turn off
temperature Extra Low 105° ± 5°F
(41°± 3°C) 10–15°F
(6–8°C)
below the
heat turn off
temperature The measured overshoot using the glass
bulb thermometer in the exhaust outlet can
be 30°F (17°C) higher.
5. If the exhaust temperature is not within specified limits, or you have come here from step 3, remove the P14 connector, then measure the resistance between P14-3 (red-white wire) and P14-6 (redwhite wire) at the connector. If the resistance is OK, check P14-3 and P14-6 to machine ground. If resistance is greater than 0 (zero), replace wiring harness. NOTE: All thermistor resistance measurements must be made while dryer is
disconnected from power. The following table gives temperatures and ranges for the associated thermistor resistance values.
Temp
F C
Res
kΩ
Temp
F C
Res
kΩ
50° (10°) 19.0 -22.0 80° (27°) 8.5-10.5 60° (16°) 14.8-16.8 90° (32°) 6.8-8.8 70° (21°) 11.5-13.5 100° (38°) 5.0-7.0 If the thermistor resistance does not agree with table, replace the exhaust thermistor. If the thermistor resistance checks agree with the measurements in the table, replace the machine control electronics.
TEST #4b Thermal Fuse
The thermal fuse is wired in series with the dryer drive motor.
1. Unplug dryer or disconnect power.
2. Access the thermal fuse by first removing the back panel.
3. Using an ohmmeter, check the continuity across the thermal fuse. If the ohmmeter indicates an open circuit,
replace the failed thermal fuse.
TEST #4c Thermal Cut-Off
If the dryer does not produce heat, check the status of the thermal cut-off.
1. Unplug dryer or disconnect power.
2. Access the thermal cut-off by first removing the back panel. .
3. Using an ohmmeter, check the continuity across the thermal cut-off. If the ohmmeter indicates an open circuit,
replace the failed thermal cut-off and high limit thermostat. In addition, check for blocked or improper exhaust
system.

TEST #4d Gas Valve
1. Unplug dryer or disconnect power.
2. Access the gas valve by removing the front panel and drum assembly.
3. Use an ohmmeter to determine if a gas valve coil has failed. Remove harness plugs. Measure resistance across terminals.

on Apr 11, 2009 | Whirlpool LER4634J Electric Dryer

1 Answer

Non Glowing Igniter


What solenoids are you referring to?

When you set the timer and heat selector switches on your dryer and press the button [switch] to turn it on, the direction of 120VAC passes through the heat selector switch through the timer switch through the cycling thermostat through the hi-limit switch, through the thermal cut-off fuse to the burner assembly's gas valve.

Simultaneously, as the current is traveling through a path to the 1st gas valve coil, current is also traveling through a path to the flame sensor- and then to the igniter.

The igniter will begin to glow and when it gets hot enough, the flame sensor will detect the heat and switch off. which then diverts current to the second gas valve coils.

The second gas valve coils activate plungers in the gas valve which allows gas to flow out into the burner housing. The igniter still being hot, ignites the gas to a long blue flame.

To maintain the proper air temperature, the heat in the blower housing is monitored by the cycling thermostat. During normal operation, air temperature should be between 120 degrees Fahrenheit and 160 degrees Fahrenheit.

When the air reaches the proper temperature specific to your dryer model, the cycling thermostat will switch off the voltage to the burner assembly.

The hi-limit thermostat and thermal cut-off fuse monitor the drum air temperature. If there is an air flow problem [restriction or total blockage], the hi-limit thermostat may switch off the voltage to prevent damage to the dryer.

Eventually, if the air flow problem [restriction or total blockage] is not corrected, the thermal cut-off fuse will fail (blow) and the dryer won't heat at all.

Check continuity to the following components, thermal cut-off fuse, hi-limit thermostat, igniter, flame sensor, and cycling thermostat. Of course you will take your readings with the power cord of the dryer unplugged from the wall outlet.

You will either disconnect [isolate] any of the wire leads going to their respective components during the test [using a multimeter (analog or digital)]; OR remove each of the components entirely from the dryer to test them.

1.) A good thermal cut-off fuse will have 0 Ohms of resistance. On the other hand, if the needle [on a an analog tester] does not move OR the digital display [on a digital meter] has not changed significantly, there is NO continuity - which means the fuse has burned out and needs to be replaced

2.) A dryer's Hi-Limit Thermostat is activated by hi-temperature changes (between 250 degrees Fahrenheit and 300 degrees Fahrenheit.

A good hi-limit thermostat will have 0 Ohms of resistance at room temperature.

To test the thermostat's response to temperature change, place the component on an electric griddle or skillet. Set the heat on the skillet or griddle to the appropriate temperature according to the temperature rating stamped on the hi-limit thermostat you are testing. If the hi-limit thermostat switches off within 5% of that temperature, the part is functioning properly. However, if the hi-limit thermostat does not switch off OR switches off prematurely, the hi-limit thermostat is faulty and will have to be replaced. [Remember, when the switch turns off at the appropriate temperature level- you should get a high resistance reading to show that the circuit is "open")

3.) Perform the same procedure as step 2 to test the Cycling Thermostat: First at room temperature and then its response to temperature change. The only difference is, the test temperature range will be somewhere between 120-160 degrees Fahrenheit Once again, refer to the temperature rating stamped on the component you are testing- and the 5% tolerance remains the same, too.

4.) The resistance reading for the igniter is between 50 and 400 Ohms of resistance; anything else, it's faulty- toss it and replace it.

5.) You should get a resistance reading of 0 Ohms at the flame sensor-

Flame sensors are tricky though. Flame sensors could still short out and
allow the igniter to glow- but would prevent voltage from reaching the gas coil. For example, the igniter will glow and not turn off and a flame will not be established because there was no voltage at the gas coil to open up and release gas for ignition.

Hope this info helps...I would appreciate a follow-up from you when you resolve this problem- to gain more knowledge and skill.

Thank-you and best wishes on your project

Jul 15, 2013 | Whirlpool LGR3624JQ Gas Dryer

1 Answer

No heat from tumble dryer


Hi.

If dryer is electric check for lint obstructions, check ventilation, test thermal fuse, thermistor, cycling thermostat and high limit, element and fan.

If dryer is gas check for lint obstructions, check ventilation, test thermal fuse, thermistor, cycling thermostat and high limit, igniter, coils, burner, flame sensor and fan.

Dec 14, 2011 | Washing Machines

1 Answer

Propain gass dyer. runs but very little heat. replaced gas valve coils and no change. Now I believe I have to check limit switches, but not sure how to test..What about the RADIANT SENSOR? NEED...


Hi.

More than limit switches if burner is turning on but heating is poor you should check cycling themostat and then blower motor, lint filter and parts comprised in blower assembly.

When the problem is the high limit, there is no heat at all.
When the problem is radiant sensor, there is no heat at all.

Poor heating means either: defective cycling thermostat; clogged air ducts; defective blower system, problem with timer or temperature selector.

If the heating turns off in the middle of the cycle check also door switch.

Here Cycling thermostat:


10_22_2011_10_57_23_am.gif

The cycling thermostat is located in the blower assembly. Here removal instructions. Disconnect power first:

10_22_2011_11_00_07_am.gif

The thermostat can be tested using a multimeter. Set the multimeter on impedance (Ohms). Good thermostat will read about Ohms at room and will read open (infinity) at 150F.

Once in there also check the thermal fuse and check blower assembly. Remove lint and make sure blower is working. Thermal fuse is tested reading impedance across its two contacts. Remove fuse from circuit and touch with multimeter probes fuse's contacts (same for thermostat). If fuse is good it will read zero Ohms or very little impedance. a bad fuse reads infinity.

Check also the exhaust. Make sure there is no blockage.

Operations are illustrated from page 72 of service manual: Here the service manual.


10_22_2011_11_09_36_am.gif

About the flame sensor, that is a part that rarely fails. If the dryer ignites the radiant sensor is not responsible for the fault.
The radiant sensor is mounted in parallel with the coil.



When temperature is reached the sensor opens up allowing power to burner valve (valve 2). Testing the flame sensor like a thermostat is difficult because it opens up at high temp. I read volts while operating. I suggest users carrying only maintenance that can be performed with power off.

10_22_2011_11_18_01_am.gif

If the burner shuts down at random more than the sensor check the door switch. Run a cycle with door switch contacts jumped.

Start checking cycling thermostat and air ducts, those are problems that usually cause low heating.

Regards.

Ginko

Oct 21, 2011 | Maytag Neptune MDG5500AW Gas Dryer

1 Answer

Where would the fuse be and how hard to get to, is it in the upper unit? From behind? or lower unit? Running but no heat.


The problem is obviously in the heating circuit which is basically composed of the heating element, thermal cut-off, high-limit thermostat, cycling thermostat, and the motor centrifugal switch. The most common part that causes the dryer not to heat is the thermal cut-off and/or the high-limit thermostat. Verify this condition by bypassing the said components.

Disconnect power then access the thermal cut-off (cut-out) and the high-limit thermostat. Disconnect the wires of each component then connect them together and insulate it properly. Reconnect power then start the dryer. The problem is indeed in the thermal cut-off (cut-out) and the high-limit thermostat if the dryer heats up. Replace both parts and it should solve the problem. It is an easy and cheap repair to make. Indicate the exact model number of the dryer should you need further assistance.

jahn27_42.jpg
Dryers with lint filter on the front.

jahn27_43.jpg
Dryers with lint filter on the top.

Also bypass the cycling thermostat if the dryer still doesn't heat with the thermal cut-off and the high-limit thermostat bypassed. Check the heating element visually for obvious broken or damaged coil. An ohmmeter will be of great help in checking the resistance/continuity of the heating element. Replace the heating element if broken or damaged, NEVER attempt to repair it.

The problem is likely in the motor centrifugal switch if the dryer still doesn't heat with good heating element and the three components above bypassed. Indicate the exact model number of the dryer should you need further assistance.

Feb 01, 2011 | Dryers

1 Answer

Dryers tumbles but there is no heat


The problem is obviously in the heating circuit which is basically composed of the heating element, thermal cut-off, high-limit thermostat, cycling thermostat, and the motor centrifugal switch. The most common part that causes the dryer not to heat is the thermal cut-off and/or the high-limit thermostat. Verify this condition by bypassing the said components.

Disconnect power then access the thermal cut-off (cut-out) and the high-limit thermostat. Disconnect the wires of each component then connect them together and insulate it properly. Reconnect power then start the dryer. The problem is indeed in the thermal cut-off (cut-out) and the high-limit thermostat if the dryer heats up. Replace both parts and it should solve the problem. It is an easy and cheap repair to make. Indicate the exact model number of the dryer should you need further assistance.

jahn27_42.jpg
Dryers with lint filter on the front.

jahn27_43.jpg
Dryers with lint filter on the top.

Also bypass the cycling thermostat if the dryer still doesn't heat with the thermal cut-off and the high-limit thermostat bypassed. Check the heating element visually for obvious broken or damaged coil. An ohmmeter will be of great help in checking the resistance/continuity of the heating element. Replace the heating element if broken or damaged, NEVER attempt to repair it.

The problem is likely in the motor centrifugal switch if the dryer still doesn't heat with good heating element and the three components above bypassed. Indicate the exact model number of the dryer should you need further assistance.


Dec 31, 2010 | Kenmore 600 6965 Electric Dryer

1 Answer

I have an older Kenmore gas dryer model # 97260100 it heats up for 15 minutes then goes cold, drum continues to run can u give me any insight as to what needs to be replaced


The problem is either of the cycling thermostat, high-limit thermostat or the gas valve solenoid coils sitting on top of the gas valve assembly. Disconnect power then verify any of these condition by bypassing the thermostats. Refer to the image below and locate the thermostats.
jahn27_16.jpg
Note: This is an image of an electric dryer but the thermostat and the thermal cut-off (cut-out) locations are the same.

Disconnect each of the thermostat wires then connect and insulate them properly. Once done, reconnect power and start the dryer. The gas valve solenoid coils are indeed faulty and both need to be replaced if the problem still persists. Click here for the procedure in replacing the solenoid coils.

Gas Valve Solenoid Coils Replacement Procedure

Either or both of the cycling thermostat and the high-limit thermostat are malfunctioning if the dryer continues to heat up with the thermostats bypassed. Disconnect power then reconnect the cycling thermostat wires but keeping the high-limit thermostat bypassed. Reconnect power then start the dryer. The high-limit thermostat is the culprit if the dryer continues to heat up. If not, then the cycling thermostat is the culprit.

Also do the other way; that is reconnecting the high-limit thermostat wires but keeping the cycling thermostat bypassed. The cycling thermostat is the culprit if the dryer continues to heat up. If not, then the high-limit thermostat is the culprit.

Replace the faulty thermostat and it should solve the problem.

Nov 08, 2010 | Kenmore 72872 Gas Dryer

1 Answer

Have a kenmore model # 110.72822101, where's the thermostat located, my dryer gets hot then cold


The cycling thermostat or the high-limit thermostat may not be the problem but rather the gas valve solenoid coils sitting on top of the gas valve assembly. Disconnect power then verify this condition by bypassing the thermostats. Refer to the image below and locate the thermostats.
jahn27_15.jpg
Note: This is an image of an electric dryer but the thermostat and the thermal cut-off (cut-out) locations are the same.

Disconnect each of the thermostat wires then connect and insulate them properly. Once done, reconnect power and start the dryer. The gas valve solenoid coils are indeed faulty and both need to be replaced if the problem still persists. Click here for the procedure in replacing the solenoid coils.

Gas Valve Solenoid Coils Replacement Procedure

Either or both of the cycling thermostat and the high-limit thermostat are malfunctioning if the dryer continues to heat up with the thermostats bypassed. Disconnect power then reconnect the cycling thermostat wires but keeping the high-limit thermostat bypassed. Reconnect power then start the dryer. The high-limit thermostat is the culprit if the dryer continues to heat up. If not, then the cycling thermostat is the culprit.

Also do the other way; that is reconnecting the high-limit thermostat wires but keeping the cycling thermostat bypassed. The cycling thermostat is the culprit if the dryer continues to heat up. If not, then the high-limit thermostat is the culprit.

Replace the faulty thermostat and it should solve the problem.

Nov 08, 2010 | Kenmore 72822Gas Dryer

1 Answer

Location fuses Whirpool duet dryer


The thermal fuse is located on the blower housing outlet to the left of the thermistor. For electric dryers, the thermal cut-off and high-limit thermostat are located on the heater housing. For gas dryers, the high-limit thermostat and the flame sensor are located on the burner.

Disconnect the dryer from the power outlet and turn-off the gas supply for gas dryers.

Remove the two screws at the bottom of the toe panel securing it to the cabinet. Pull the toe panel down and off the cabinet.

Check the continuity of the thermal fuse with an ohmmeter set to X1. The ohmmeter should read zero ohms. Replace both the thermal fuse (part #3392519) and the thermistor (part #8577274) if the resistance reads open or infinite. Remove the securing screws and install the replacement part.

Do the same with the thermal cut-off. Replace both the thermal cut-off (part #279973) and the high-limit thermostat (part #3391914) if the resistance reads open or infinite. Remove the securing screws and install the replacement part.

The high-limit thermostat is located next to the heater terminal block and next to it is the thermal cut-off.

Slide the toe panel in place up and into the cabinet and secure it with the screws.

Note: Disconnect the wires from the terminals of the component before performing the continuity test.

Feb 22, 2010 | Washing Machines

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