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Error code reference

Bosch Dryer Error Code E:02

Main heating circuit

Bosch codesBosch dryer codes

Main heating circuit - overheating stage 2 (Error).

First step from the service manual

Clean lint filter, airways or heat exchanger.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E:02 means on a Bosch dryer

The E:02 error code on a Bosch dryer indicates a stage 2 overheating fault in the main heating circuit. This is a more serious thermal event than a stage 1 warning, meaning the dryer's internal temperature sensors have detected heat levels that exceed safe operating thresholds at a secondary trip point. The heating circuit includes the heating element, thermal cutoff devices, thermostats, and the airflow path that carries heat through the drum and out the exhaust. When airflow is restricted, heat builds up rapidly and triggers these staged overheat protections.

The most common root cause of E:02 is restricted airflow due to a clogged lint filter, blocked exhaust ducting, or a fouled heat exchanger (on condenser models). When hot air cannot circulate and exhaust properly, temperatures in the heating circuit climb beyond normal operating range. On condenser dryers, the heat exchanger fins trap lint and debris over time, progressively reducing heat dissipation efficiency until an overheat condition occurs. Vented models are susceptible to blocked or kinked exhaust ducts, which create back pressure and trap heat inside the drum cavity.

If cleaning the lint filter, airways, and heat exchanger does not resolve the error, the fault may point to a failed thermostat, a defective thermal cutoff fuse, or a malfunctioning temperature sensor within the heating circuit. These components regulate and limit heating element operation and can fail in a closed or open state. A failed high-limit thermostat that does not cut power to the element at the correct temperature would allow runaway heating, triggering the E:02 fault even with clean airflow paths.

Source: manufacturer service documentation.

Common causes of E:02

  1. 01

    Clogged lint filter

    Wiring / connection

    A heavily loaded lint filter is the most frequent cause of overheating. Check and clean the filter before every cycle, and inspect it for tears or bypass gaps that allow lint to accumulate deeper in the system.

  2. 02

    Blocked or dirty heat exchanger (condenser models)

    Wiring / connection

    On condenser dryers, the heat exchanger fins collect lint and dust over time, drastically reducing airflow and heat transfer efficiency. Remove and rinse the heat exchanger under running water to clear debris.

  3. 03

    Restricted or blocked exhaust duct (vented models)

    Wiring / connection

    A kinked, crushed, or lint-packed exhaust duct prevents hot air from escaping the dryer. Inspect the full length of the duct from the dryer to the exterior vent cap and clear any obstructions.

  4. 04

    Failed high-limit thermostat

    Part replacement

    The high-limit thermostat is designed to cut power to the heating element when temperatures exceed a safe level. If this thermostat fails and does not open the circuit at the correct temperature, the heating circuit will overheat even when airflow is adequate.

  5. 05

    Defective thermal cutoff fuse

    Part replacement

    A thermal cutoff fuse is a one-time safety device in the heating circuit that permanently opens if temperatures spike too high. If it has already tripped due to a prior overheat event, the heating circuit behavior may become erratic, and the fuse must be replaced along with addressing the root cause.

See the test procedure for each cause

Frequently asked questions about E:02

What does E:02 mean on a Bosch dryer?
E:02 indicates a stage 2 overheating fault in the main heating circuit. The dryer's temperature monitoring system has detected heat levels beyond safe limits and has shut down to protect the appliance and your home. This is a more severe thermal condition than a stage 1 event and requires attention before the dryer should be run again.
How do I fix the E:02 error on my Bosch dryer?
Start by cleaning the lint filter thoroughly and inspecting the exhaust duct or heat exchanger depending on your model type. On condenser models, remove and rinse the heat exchanger under water to remove lint buildup. On vented models, check the entire exhaust duct run for kinks or blockages. If cleaning airflow components does not clear the fault, a thermostat or thermal cutoff component in the heating circuit may need professional testing and replacement.
Is it safe to keep using my dryer with an E:02 error?
No, you should not continue operating the dryer while E:02 is active. This code signals that the heating circuit has reached a dangerous temperature level, which poses a risk of damage to internal components and a potential fire hazard. Resolve the cause of the overheating before running another cycle.
Will resetting my Bosch dryer clear the E:02 error?
A reset may temporarily clear the displayed error, but it will not resolve the underlying overheating condition. If the root cause, such as a blocked lint filter, clogged heat exchanger, or restricted duct, is not corrected first, the dryer will overheat again and the fault will return. Always address the cause before attempting to restart the dryer.
How much does it cost to repair a Bosch dryer with an E:02 error?
If the fix involves only cleaning the lint filter, heat exchanger, or exhaust duct, there is no parts cost and the repair is a straightforward DIY task. If a component such as a thermostat or thermal cutoff fuse has failed, parts typically range from $10 to $60 depending on the specific component, with professional labor adding $80 to $200 or more depending on your location and service provider.

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