Tip & How-To about Heating & Cooling

Troubleshooting Element Appliances.

Use a multimeter set to Ohms, then check for continuity from the Phase to the switch, then to the Thermal fuse, < thats a good candidate for replacement, it should read a "Short" across it, OPEN circuit means it has failed. then from Thermal fuse, if OK, to the Element(s), these should have resistance of about 11 - 14 Ohms...from one side to the neutral. When ON, there should be a Resistance reading on the Meter, of up to 14 Ohms measured across the 3 pin plug, Phase to Neutral. would be OK, for a 1000Watt 1KW appliance, it scales up & down.
Essentially with Neutral, as common, the Phase comes in to one side of a Switch, the "Other" side of the switch goes to the Thermal Fuse, the "Other" side of that Fuse, goes to the "Hot" side of the Element. and the "Other" "Cold" side goes to Neutral, common. So essentially with the switch in the ON position, we should get a resistance reading on our meter, measuring from Phase to Neutral. The reading is in accordance with Ohms law. IE: To get the resistance of an appliance, we take the Wattage, & divide it by the Voltage, Taking the answer from that, Amps, we then, divide the Voltage by that result, and we have our Resistance.EG: 1000 Watts, divided by 112Volts = 8.9Amps. Therefore 112Volts divided by 8.9Amps = 12.4 Ohms. That is your resistance or Load, or Element.

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dryer does not heat up



Hi.

Start checking if the ignitor is working and if flame is coming on. If igniter is not working, replace the igniter. If there is no flame test the coils contacts using a multimeter set on Ohms. The coils must return continuity between two of their contacts or they are defective and the valve will not be open. Replace defective coils if needed.

Test and replace the thermal fuse.

The part is tested touching the fuse contacts with the probes of a multimeter set on Ohms. If the fuse is good it will read zero. A bad fuse shows Ohms infinity (open).

If fuse is not the culprit, then you will need to reach the thermostats, testing them with the multimeter. apart the thermal fuse there is one thermistor and one thermal cutoff.

When you access the thermostats clean the lint from air ducts. If fuse or thermostat has blown it means that lint or poor ventilation has caused overheating.

Check fuse if problem is not fixed test the thermostats.


Regards.

Ginko

Jun 14, 2011 | Maytag Neptune MDG5500AW Gas Dryer

1 Answer

my lg gas dryer doesnt get hot.


Hi.

As first thing try replacing the thermal fuse.

The thermal fuse is located in the blower housing, near to the exhaust at the back of the dryer. The thermal fuse cost is only few dollars. Before replacement it can be tested reading Ohms with a multimeter. If the multimeter set on impedance reads infinite Ohms (No continuity, same as on air), then the fuse must be replaced. A good fuse must read low or zero impedance.

If the thermal fuse is OK, the next parts to test are the thermostats. On GE gas dryers there are at least two thermostats. One is a control of themperature, the other is an high limit. High limit is hosted on the blower housing, near to the thermal fuse. There is one or two thermostats near to the blower wheel. Often there is a safety thermostat near to the burner. To get details on the specific model check the schematics tucked inside the appliance or available online.
The thermostats are tested reading Ohms at room temperature. If any of them returns no continuity at room, then the thermostat is faulty and must be replaced.

If the thermostats and fuse are OK, then the next step is checking valve and igniter. The igniter or glowbar is tested energizing it and observing if there is spark. The valve is tested reading Ohms on solenoid with multimeter set at Rx1. If the solenoid has no continuity, then the valve is faulty. There is also a flame sensor that can be tested reading impedance or jumping its contacts.

If all the parts listed above are OK, then wiring and electronic timer control board must be tested reading voltages at contacts.

The problem is likely the thermal fuse or one of the thermostats.

Apart replacing the part, ensure that the hoses are not blocked , and that there is no lint inside the machine. This may have caused the fuse blowing.

Here a general diagram that can help you in identifying parts.

All tests must be done by a trained technician.

To get a technician on site , or to get a quote on repair ring the number listed on the owners manual.You can also get an US technician contact using our directory:Contacts.

To get parts ring GE at the number on manual.

You can also use one of the websites listed here to get parts and diagrams:

Where do I find parts and diagrams for my Appliance?




Apr 30, 2010 | Dryers

1 Answer

heater stopped working


Use a multimeter set to Ohms, then check for continuity from the Phase to the switch, then to the Thermal fuse, < thats a good candidate for replacement, it should read a "Short" across it, OPEN circuit means it has failed. then from Thermal fuse, if OK, to Element(s), these should have resistance of about 12 - 15 Ohms...from one side to the neutral. When ON, there should be a Resistance reading on the Meter, of up to 20 Ohms measured across the 3 pin plug.would be OK.
Essentially with Neutral, as common, the Phase comes in to one side of a switch, the "Other" side of the switch goes to the Thermal Fuse, the "Other" side of that Fuse, goes to the "Hot" side of the Element. and the "Other" "Cold" side goes to Neutral, common. So essentially with the switch in the ON position, we should get a resistance reading on our meter. The reading is in accordance with Ohms law. IE: To get the resistance of an appliance, we take the Wattage, & divide it by the Voltage, Taking the answer from that, we then, divide the Voltage by that result, and we have our resistance. EG: 1000 Watts, divided by 112Volts = 8.9Amps. Therefore 112Volts divided by 8.9 = 12.4 Ohms. That is your resistance or Load. Hope this helps.

Feb 08, 2010 | Lakewood Oil-Filled Electric Radiator...

1 Answer

how do i test a thermal fuse on a kenmore dryer model number 11066732500?


A fuse is tested using the continuity or resistance (ohm) setting on a multimeter.

Disconnect the power to the dryer. Disconnect the leads to the fuse. With the meter set on continuity, the meter should beep - if you set to ohms, you should read 0 ohms across the terminals of the fuse. If you read infinity, the fuse is bad.

Mar 13, 2009 | Kenmore 74602 Gas Dryer

1 Answer

thermal fuse


Luke, before doing this, please disconnect your dryer from the electrical service. With the back panel removed...The thermal fuse is located on the blower housing, (lower left) and is white in color. If you have a multimeter, remove one of the 2 wires and check OHMS. If you read continuity, it's good. If it checks OK, go to your element can. There are two t'stats there on the left above the connectors for the element, check those the same as the thermal fuse. If any of these tests show anything other than OHMS, that's the problem. DOING THIS IS DANGEROUS. EXERCISE CAUTION. If you don't have a multimeter, you can pull both wires off of each of the t'stats individually and connect them together... essentially bypassing them one at a time. Then plug the dryer in and test it. If there is heat, you have isolated the faulty component. Let us know what you find.

Aug 02, 2007 | Roper REX5635E Dryer

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