When a Kenmore dryer displays an F40 code, it indicates that there is a communication error between the machine control and the motor control. This is typically caused by a faulty connection between the two components.
To resolve this issue, the dryer should be checked for any loose or disconnected wires between the machine control and motor control.
Additionally, any corroded or damaged wires should be replaced to ensure that the two components are communicating properly. If the problem persists, a certified technician should be consulted.
Kenmore Dryer F40 Code – Troubleshoot And Diagnosis
Let’s see the solution.
1. Check The Communication Harness
The Kenmore F40 dryer code is an error code that indicates a communication issue between the machine control electronics and the motor control electronics.
To address this issue, you need to check the three-wire harness that connects the two components. Make sure the harness is fully inserted, clean, and tightly secured. If it is loose or dirty, try reseating it. If that doesn’t work, you may need to replace it.
In addition to the three-wire harness, also check the connections between the machine control electronics and the motor control electronics. Make sure they are clean and connected securely. If the connections are loose or dirty, try reseating them. If that doesn’t work, you may need to replace them.
If all the connections are secure and clean, the Kenmore Dryer F40 code will likely still be present. In this case, the issue could be a faulty component in the machine control electronics or the motor control electronics. If this is the case, you may need to replace the component in order to resolve the issue.
2. Check Control Panel Wiring Harness
The Kenmore dryer F40 error code is an indication that there is a problem with the control panel wiring harness.
This wiring harness carries power from the dryer’s main control board and connects to various components in the appliance including the temperature sensor and motor relay.
To fix this issue, homeowners need to check their control panel wiring harness for any loose or broken wires, or any other damage that could be causing a short circuit.
If any of these issues are present, then the wiring must be replaced by a qualified service technician. It is important to note that replacing the entire control board may not solve the issue if only one wire in the harness is damaged. Therefore it’s important to inspect each wire carefully and replace them individually if necessary.
3. Check Voltage To The Motor Control
This error code can prevent the dryer from operating correctly and should be addressed as soon as possible. In most cases, it may be necessary to check the voltage to the motor control in order to determine what needs to be done in order to fix this issue.
In order to check the voltage of the motor control, you will need a multimeter or other testing device. First, turn off your dryer and unplug it from its power source. Then locate and remove the back panel of your dryer so you can access its wiring harnesses and connections.
Once you have exposed these parts, set your multimeter accordingly and measure each connection point in relation to ground via their wiring harnesses. In most cases, your multimeter will show that the voltage is higher than what it should be. If this is the case, you will need to replace the motor control in order to fix this issue.
4. Blown Thermal Fuse
Kenmore Dryers are known for their reliability, but when the F40 Error Code appears, it can be an indication of a more serious problem. The most common cause of the F40 Error code is a blown thermal fuse.
A thermal fuse is responsible for regulating temperature; if it fails, it will shut down power to the dryer.
A burnt-out thermal fuse needs to be replaced in order to get your Kenmore Dryer running again. It is important that you do not try to bypass or repair the thermostat, as this could cause further damage and pose a safety risk.
Instead, unplug your dryer from its power source and remove the back panel of your appliance in order to access and replace the thermal fuse with a new one specifically to your model number.
Hi there! I’m Sam Hendricks, and I’m a repair technician and expert. I created this website to help people like you save money and time by fixing your own appliances.
Over the years, I’ve seen people spend a lot of money on unnecessary repairs or replacements. That’s why I decided to share my expertise and create easy-to-follow guides for fixing appliances on your own.