Hotpoint Tumble Dryer Error Code E66: Thermal Limiter... | appliancefaults.com

Technical Background:

The E66 error code on a Hotpoint tumble dryer indicates that the main control unit (MCU) has detected an open circuit or excessive temperature condition at the thermal limiter. The MCU monitors the voltage drop across the thermal limiter. If the resistance increases beyond a set threshold (due to a tripped limiter), the MCU throws the E66 error to prevent damage.

Symptoms:

The homeowner reports the dryer stops mid-cycle and displays the E66 error code. The dryer may or may not produce heat. The error may appear intermittently or consistently.

Possible Causes:

Blocked vent causing overheating.
Faulty thermal limiter.
Defective heating element.
Control board (MCU) malfunction.
Wiring harness issue affecting thermal limiter circuit.

Solution:

1

Unplug the dryer from the 120V AC outlet or turn off the breaker.
2

Locate the thermal limiter, usually on the blower housing or near the heating element. You'll likely need a 1/4-inch nut driver to remove access panels.
3

Use a multimeter to check continuity across the thermal limiter terminals. It should read near 0 ohms. Replace if open (no continuity).
4

Inspect the heating element for continuity (typically 9-13 ohms) and any signs of damage. Use a multimeter and set it to measure ohms.
5

Check the dryer vent for obstructions. Clean thoroughly. A blocked vent is the most common cause of thermal limiter trips.
6

Inspect the wiring harness for loose connections or damage. Repair as needed. Look for burnt or frayed wires near the heating element and thermal limiter.
7

If the above steps don't resolve the issue, the MCU may be faulty and require replacement or licensed technician repair. Consider licensed technician diagnosis.

Safety Warning:

Disconnect power to the dryer before performing any repairs. High voltage is present when the dryer is plugged in. Follow Lock Out/Tag Out (LOTO) procedures to prevent accidental energization.

Prevention:

Clean the lint filter after every load. Inspect and clean the dryer vent at least once a year. Ensure proper airflow around the dryer. Avoid overloading the dryer.

Expert Tip:

Some Hotpoint dryers have a diagnostic mode. Consult the service manual for the specific model. Entering service mode might give more detailed error codes or allow you to test components directly.

Frequently Asked Questions

•Where is the thermal limiter located on my specific Hotpoint dryer model?

The thermal limiter is usually located on the blower housing or near the heating element assembly. Consult your dryer's service manual for an exact location.

•What is the proper resistance reading for the heating element in my Hotpoint dryer?

The heating element resistance typically ranges from 9 to 13 ohms. However, it is crucial to refer to the dryer's service manual or the heating element itself for the exact specifications for your specific model.

•How do I access the dryer's service mode to view more detailed error codes?

Accessing the service mode varies depending on the specific model. Consult the service manual for your dryer, as the key sequence for entering service mode is often model-specific.

Hotpoint Tumble Dryer Error Code E66: Thermal Limiter Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the thermal limiter located on my specific Hotpoint dryer model?

•What is the proper resistance reading for the heating element in my Hotpoint dryer?

•How do I access the dryer's service mode to view more detailed error codes?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: