If your dryer timer is not working, it can completely disrupt the drying process. The timer controls the proper sequence of cycles and ensures the appliance shuts off at the right time. In this article, we’ll explore why a dryer timer might fail, the warning signs to watch for, and what you can do to fix it. Proper diagnosis and timely repair can help prevent overheating, damage to your clothes, and repeat breakdowns. Book our dryer repair service:
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Reasons Why the Dryer Timer Not Working
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Damaged Timer Knob
If the timer knob is damaged, the dryer may not correctly determine the selected mode or may not start at all. Often, when the mounting or internal mechanism wears out, the knob begins to spin freely without activating the selected cycle. As a result, the dryer can get stuck in the heating stage and keep blowing hot air even after the main drying cycle is finished. This leads to overheating, increased wear on parts, and even a risk of fire. There’s also a chance the timer will track time incorrectly, and the dryer won’t shut off when it’s supposed to.
Solution
- Inspect the timer knob. Check for cracks, chips, wear, and especially how it connects to the timer shaft.
- If the knob spins freely, feels loose, or doesn’t transfer movement to the timer, it needs to be replaced.
- It’s important to use the original or a compatible part for your dryer model since universal replacements might not fit tightly or switch cycles properly.
- If the knob is installed correctly but the dryer still overheats — the problem might be deeper and involve the entire timer unit.
Pro Tip:
Temporary fixes using glue, tape, or other DIY solutions are a bad idea. First, it won’t solve the problem. Second, it might damage the timer shaft even more. At the first signs of failure, it’s best to order the original part and replace it right away.
Faulty Timer Motor
The timer motor’s job is to switch the dryer through its different stages, from start to finish. If the motor stops working properly, the dryer usually freezes in the heating mode. This means that even after the cycle is over, the heating element keeps running, overheating both the appliance and your clothes. This behavior can be dangerous, especially if you don’t notice the malfunction right away.
Solution
- Check the timer with a multimeter — for circuit continuity and power going to the motor.
- If the circuit is open or the motor shows no signs of activity, the timer unit needs to be replaced.
- In most dryers, the motor isn’t replaced separately — you have to order the entire timer assembly.
- The replacement part must match your dryer model. Before installation, unplug the dryer from the power source, since the timer is connected to high-voltage components.
Pro Tip:
Even if the timer still ticks, it may not be advancing. Test the motor thoroughly to avoid future overheating and cycle malfunctions.
Electrical Power Issues
The timer’s performance can be affected by incorrect voltage, faulty outlets, loose terminals, and power surges. If your dryer is overheating, it might be because the relay isn’t receiving the signal to end the cycle due to power disruptions. A common issue is when one of the two hot wires loses contact. In this case, some functions might not work correctly, including heat control.
Solution
- Check the outlet and power cord.
- The voltage must match the appliance requirements.
- Use a multimeter to test the voltage across the terminals.
- Also, check the breakers and fuses in the electrical panel — one may be tripped or blown.
- If everything looks good but the problem persists, call a professional for in-depth diagnostics.
Pro Tip:
Never connect a dryer through extension cords. This can cause overheating, unstable operation, and damage to the electronics.
Door Switch Malfunction
The door switch is a safety feature that prevents the dryer from operating when the door is open. If it’s broken, the dryer may “think” the door is open or closed at the wrong time. In some cases, a faulty switch can create a loop where the heating element or timer keeps running. This leads to uncontrolled heating, overheating the drum and the internal parts.
Solution
- Test the door switch with a multimeter.
- When the door is open, the circuit should be open; when closed — it should be closed. If this doesn’t happen, the switch must be replaced.
- It’s a simple process — just disconnect the old switch and connect a new one to the same terminals, securing it in place.
- Always unplug the dryer before doing any repairs.
Pro Tip:
If you don’t hear a click when closing the door or it doesn’t latch properly, it’s a sign of a worn-out switch. Don’t slam the door to force it closed — that only speeds up the breakdown. Replace the part early to keep your dryer safe.
Defective Cycling Thermostat
The cycling thermostat is responsible for maintaining the proper temperature inside the dryer. Its correct operation is closely tied to the timer’s performance: if the dryer drum doesn’t reach or exceeds the intended temperature, the timer may malfunction—causing the cycle to run too long or end too early. The timer relies on stable internal temperatures for accurate cycle timing, especially in automatic drying modes.
Solution
- Test the thermostat using a multimeter set to measure resistance. If the circuit shows continuity when it shouldn’t, or the readings are out of spec, the thermostat needs to be replaced.
- Replacement is typically done from the rear panel of the dryer, where most temperature sensors are located. Before installing the new thermostat, make sure it’s compatible with your specific dryer model.
Pro Tip:
If you notice overheating, a burning smell, frequent thermal fuse trips, or issues with the timer, start by checking the thermostat. Its proper function is essential not only for temperature regulation but also for the safe and accurate operation of drying cycles.
Repair Cost
| Timer knob replacing | $180-$220 |
| Timer replacing | $250-$320 |
| Timer motor replacing | $180-$220 |
| Door switch replacing | $220-$280 |
| Cycling thermostat replacing | $220-$320 |
Dryer repair costs can differ depending on the brand, model, and how complex the problem is to diagnose and repair. If you’re experiencing issues with your dryer, our appliance repair Tampa team is ready to help with fast and reliable service.
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6 Comments
How can I tell if my Bosch dryer has a manual or automatic timer?
Hi William! Look at the control panel. If there’s a mechanical knob with time markings that you manually turn — it’s a manual timer. If the dryer offers automatic modes where you select fabric type or dryness level and it sets the time automatically — it’s an automatic timer. You can also check the user manual or use the serial number on the Bosch website.
I was advised to dry clothes on a low-temperature setting. Will that reduce wear on the timer and other parts?
Hi Thomas! Yes, low-temperature modes reduce the load on the heating element and thermostat, which in turn lowers the risk of overheating and extends the life of the timer, fuses, and temperature sensors. This is especially useful if you use the dryer frequently.
I replaced the timer, but afterward I found that the dryer still isn’t working properly. It stops in the middle of the cycle and overheats. What should I do in this case?
Hi Rob! This situation may indicate a failure in other components, such as the cycling thermostat, thermal fuse, moisture sensor (if present), faulty wiring, or incorrect installation of the new timer. It’s recommended to run a full diagnostic on the entire heating and temperature control system, starting with multimeter testing of all sensors, and if needed — contact a technician.
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