How to Troubleshoot No Heat in a Whirlpool Dryer

WhirlpoolWhirlpool DryerModerate⏱ 1 - 3 hours

Инструкция на английском (оригинал iFixit). Непонятные термины — в разделе «Основы → Словарь».

If a Whirlpool dryer tumbles but won’t heat, the problem is often a lost leg of 240 V power, heat-damaged wiring at the terminal block, a failed heating element, a failed thermal cutoff or thermostat, or a worn timer heat contact. This guide walks through safe electrical checks, rear-panel access, multimeter tests for the heater and thermostats, a timer continuity test, and basic lint and vent cleaning that can prevent repeat failures. This procedure was written using a common Whirlpool-style dryer with a rear access panel, but screw counts, connector locations, and thermostat mounting details can vary slightly between models.

🧰 Tools

Putty Knife
Wire Cutter
Wire Stripper
Vacuum Cleaner
Safety Glasses
Digital Multimeter
Large Needle Nose Pliers
Heat Gun
Quarter Inch Nut Driver

⚙️ Parts

Whirlpool Dryer Heating Element - 279838
279838 Whirlpool Dryer Heating Element
279393 Whirlpool Dryer Terminal Block Screw and Bolt Kit
279457 Whirlpool Dryer Wire and Terminal Repair Kit

ШагиSteps

Prepare for electrical testing

Unplug the dryer before removing any covers or touching internal wiring.
WARNING: A dryer uses 208–240 V, which can kill you, so don’t touch bare terminals while power is connected.
Wear safety glasses, and avoid loose clothing around sharp sheet metal edges.
Pull the dryer away from the wall so you can reach the rear panel and power cord.

Inspect the power cord and terminal block

Access the electrical terminal block area at the back of the dryer where the power cord connects.
Inspect the power cord, terminal block, and surrounding wires for melted plastic, scorch marks, or burnt wire ends.
If you see heat damage, replace the damaged cord and or terminal block before running the dryer again.

Measure supply voltage at the terminal block

Set a multimeter to AC voltage.
Plug the dryer in only for this test.
Measure between the middle and left terminals, and confirm about 120 V.
Measure between the middle and right terminals, and confirm about 120 V.
Measure between the left and right terminals, and confirm 208–240 V.
If the left-to-right reading is below 208 V, diagnose the breaker, outlet, or power cord before opening the dryer further.
Cycle the breaker fully off and fully on if the readings are odd or unstable.

Remove the rear panel

Unplug the dryer.
Use a 1/4 inch hex head screwdriver to remove the screws securing the rear panel.
Remove eight to 10 screws, depending on whether the dryer has a steam port.
If a steam port is present, remove the plastic cap and the extra screws in that area.
Lift off the rear panel.
Put the screws in a container so they don’t get lost.

Locate the heating components

Find the heating system on the right side of the dryer.
Identify the heating element, the heater housing thermostat, and the high-limit thermal fuse or thermal cutoff sensor.
Find the blower housing on the left side, along with the thermal fuse and the cycling or operating thermostat.
Inspect all visible wire connectors for burn marks or melted insulation.

Test the heating element resistance

Pull one spade connector off the heating element to prevent false meter readings through other circuits.
Use pliers to remove the spade connector if it’s too tight to pull by hand.
Set a multimeter to continuity or resistance (ohms).
Measure across the two heating element terminals.
Confirm about 9–10 Ω for a good heating element.
If the reading is wildly higher, or there is no reading at all, replace the heating element.
Measure between the heater housing thermostat terminal and the other heating element terminal if you want to test both parts in one check.

Check for a grounded heater and repair burnt terminals

Set a multimeter to continuity.
Touch one probe to a heating element spade terminal, and touch the other probe to the metal heating element casing.
If the meter beeps or shows a measurement, the heating element is grounded and must be replaced.
Inspect every wire connector for blackening or burn marks.
If a connector is burnt, cut away the damaged wire, and splice in a new connection using a heavy-gauge splicing connector and a wire nut.
WARNING: Don’t reuse heat-damaged terminals, because they can overheat again and cause further damage.

Test the thermal cutoff or high-limit thermostat

Pull one wire off the thermal cutoff or high-limit thermostat on the heater housing.
Set a multimeter to continuity or resistance (ohms).
Probe the sensor terminals, and confirm continuity or near 0.0 Ω.
If the sensor is open, electricity can’t reach the heater, and the dryer won’t heat.
If this part has failed, check for airflow problems, because restrictions and lint buildup can cause repeated overheating.
Replace a failed thermal cutoff with a matching thermostat as a set when possible.

Clean lint and check airflow restrictions

Clean lint buildup inside the dryer cabinet around the heater housing, blower housing, and vent ducting.
Clean the exhaust vent path so air can vent outside properly.
Caution: Don’t pull on wires while cleaning, and avoid bending thermostat terminals.
If a thermal cutoff has blown, treat airflow cleaning as required to prevent the replacement part from failing again.

Test the cycling or operating thermostat

Pull one of the red wires off the cycling or operating thermostat.
Measure between the exposed thermostat spade and the matching red-wire spade to check for continuity or near-zero resistance.
If the meter shows OL, the thermostat circuit is open.
Pull one purple wire off the smaller prongs on the thermostat.
Set the multimeter to ohms, and measure the smaller prongs.
Confirm 5,000–10,000 Ω on the small prongs for proper low-heat operation.
If the reading is far out of spec, expect low-heat setting problems, and replace the thermostat.

Test thermostat cutout temperature if thermal cutoffs keep blowing

Use this test if thermal cutoffs repeatedly fail and the cycling thermostat tests normal at room temperature.
Set a multimeter to continuity or ohms, and connect probes to the cycling thermostat contacts.
Heat the thermostat with a hot air gun while watching the meter.
Confirm the thermostat opens around 155 °F by changing to OL on the meter.
If it keeps passing current well beyond 155 °F, replace the thermostat.
Caution: Keep the heat source away from plastic parts, wiring insulation, and lint.

Test the timer heat contacts and reassemble

Use a 1/4 inch hex head screwdriver to remove the screws holding the metal console backing.
Access the dryer timer, and disconnect the two bottom wire harnesses.
Release the console spring clips by pushing a putty knife between the console housing and the dryer housing, then pivot the console up and out.
Disconnect additional timer wires if needed to fully free the console for testing.
Locate the timer connector set labeled A, B, C, and H, set the dial to a high-heat timed setting (about 30–70 minutes), and test continuity between A–B and A–C.
If you don’t get continuity or measurable resistance on the heat contacts, replace the timer.
Turn the timer dial clockwise only to avoid gear damage.
Reconnect the harnesses, hook the console into place, snap the spring clips closed, and reinstall the console backing and rear panel.

If the dryer heats again after you correct the failed heater, thermostat, timer, or supply problem, finish by cleaning lint and checking airflow so the same overheating failure does not return. If the heater circuit still tests good but the dryer stays cold, keep the diagnosis focused on wiring damage and control-path faults rather than unrelated drum-wear parts. Repair didn't go as planned? Ask our Answers community for help.

«How to Troubleshoot No Heat in a Whirlpool Dryer» — автор Ben Schlichter, iFixit, лицензия CC BY-NC-SA 3.0. Показано без изменений. Открыть оригинал и комментарии →