Bosch Dryer Error Code E37 — How to Fix It

What Does This Error Mean?

Bosch dryer E37 means the NTC temperature sensor that monitors the drum outlet temperature has failed or has a wiring fault. Check the sensor wiring connector first — a loose or corroded connection often causes a false E37. If the wiring is intact, the NTC sensor needs replacing — it is a small, inexpensive part (typically $10–25).

Affected Models

Bosch Series 2 Dryer
Bosch Series 4 Dryer
Bosch Series 6 Dryer
Bosch Series 8 Dryer
Bosch WTA Series
Bosch WTH Series

Common Causes

NTC temperature sensor has reached end of life and its resistance has drifted outside the normal range
Sensor wiring harness damaged, loose connector, or corroded pins on the sensor plug
Moisture ingress into the sensor housing causing short circuit or incorrect readings
Dryer overheated repeatedly in previous cycles, causing the sensor to fail from thermal stress
Control board NTC input circuit has developed a fault (less common than sensor failure)

How to Fix It

Reset the dryer

Unplug the dryer from the wall for 2 minutes, then plug back in. Occasionally a thermal spike causes a one-off E37 that clears on reset. If E37 returns, proceed with the steps below.
Locate and inspect the NTC sensor connector

Pull the dryer away from the wall and remove the back panel. Find the NTC sensor — it is a small probe clipped onto the exhaust duct with a 2-wire connector. Disconnect the connector and check for corrosion or bent pins.
Test the NTC sensor resistance

Use a multimeter set to resistance (kΩ). An NTC sensor at room temperature (20°C) typically reads 6–12 kΩ. A reading of 0 (short circuit) or OL (open circuit) means the sensor has failed and must be replaced.
Replace the NTC temperature sensor

Order the correct NTC sensor for your Bosch dryer model (the model number is on the label at the back of the machine). Disconnect the old sensor, unclip it from the duct, and fit the new one. Sensor replacement costs $10–25.
Test with a drying cycle

After replacing the sensor, run a 30-minute test cycle. If E37 clears and the dryer heats normally, the repair is complete. If E37 persists with a new sensor, the control board input circuit is faulty.

When to Call a Professional

E37 is usually a sensor replacement — a straightforward repair. If a new sensor does not resolve E37, the control board's NTC input circuit has failed and the board needs replacing — contact Bosch service.

Frequently Asked Questions

Is Bosch dryer E37 dangerous to ignore?

Do not use the dryer while E37 is active. A failed NTC sensor means the dryer cannot monitor its own temperature. Without temperature monitoring, the heating element could overheat, creating a fire risk.

How do I find the NTC sensor on my Bosch dryer?

The NTC sensor is typically clipped onto the exhaust duct inside the dryer drum housing. After removing the back panel, trace the exhaust duct from the drum — the NTC probe clips onto the duct with a small bracket and has a 2-wire harness.

Can I use my Bosch dryer at all when E37 is showing?

No — E37 disables the dryer as a safety measure. Attempting to run the machine without the temperature sensor removes thermal protection and is a fire risk.