Model #LGR7620LW0 WHIRLPOOL Residential Dryer

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Question and Answers

Q:

Why will my Whirlpool dryer only heat occasionally?

A:

When a gas dryer runs but doesn't heat, most likely the cause of the problem is an open thermal fuse. The problem can also be caused by an open thermostat, hi-limit thermostat, flame sensor or bad igniter, but most likely it is the thermal fuse. I recommend you check that first. The thermal fuse can be checked with a volt/ohm meter if you have access to one and are comfortable using it. Check for continuity across the two terminals of the thermal fuse, and if the circuit is open then the fuse is bad.

If you don't have a volt/ohm meter there is another way to check the thermal fuse, but caution must be used. With the dryer unplugged you can remove the two wires off the thermal fuse and join (jump) them together, and put a little electric tape around the connection and don't let it touch any metal. With the thermal fuse jumped carefully plug the dryer in, and run it and see if it heats. If it heats then you have found the problem. If it doesn't heat then one of the parts mentioned above is most likely bad.

There is also a possibility the dryer is not drying due to the condition of the venting hose, and if you are getting proper air flow. If air is impeded in its pathway out of the dryer, or if there is a blockage in the venting hose, it could reduce the rate at which clothes are drying in your dryer. If you are unable to clean the vents yourself, I recommend having a professional to clean the vents to clear any blockage or a technician to diagnose and repair the dryer.

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Korinna S -
Sears Technician
March 15, 2010
Q:

Why won't my Whirlpool gas dryer heat?

A:

The wiring diagram for your dryer is shown in the first image below. This diagram shows several components that could prevent your dryer from heating. A blown thermal fuse is one problem that could cause this problem. I recommend checking this component first. You can access this fuse by unplugging the dryer, shutting off the gas supply and removing the back panel of the dryer. The thermal fuse is shown in the second image. (Your dryer will have a thermostat beside this fuse instead of thermistor that is shown below.) According to the wiring diagram, your thermal fuse will have blue wires attached to it. To test the fuse, remove one wire and measure the resistance across the leads of the fuse with a volt/ohm meter. You should measure near zero ohms of resistance (continuity). If the fuse measures infinite resistance (open), then the fuse is blown and will need to be replaced.

You can order parts for your dryer from the Sears PartsDirect website. The part number for your thermal fuse is 3392519.

If the thermal fuse is okay, you can check the operating thermostat (where the thermistor is shown below) in the same manner. You can also check the high limit thermostat and the thermal cut-off on the side of the heater box. If any of these components are open, then they will need to be replaced.

If all of these components are okay, then you could have a failure in the gas valve assembly, a failed timer contact, a bad motor centrifugal switch or a wiring failure between components.

If you need more help, resubmit your question with additional details.

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Lyle W -
Sears Technician

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