mypros+
Error code reference

Bosch Dryer Error Code E:2051

Compressor

Bosch codesBosch dryer codes

Compressor - overheating error (4-digit equivalent of E:27).

First step from the service manual

Clean interior of the appliance from fluffs.

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

MyPros+ Max

Get the full diagnostic procedure for E:2051.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What E:2051 means on a Bosch dryer

Error code E:2051 on a Bosch dryer signals a compressor overheating condition. This code is the 4-digit equivalent of E:27 and is specific to heat pump dryers, which use a refrigerant-based compressor system instead of a traditional heating element. When the compressor's thermal protection detects that operating temperatures have exceeded safe limits, the dryer halts the cycle and triggers this fault to prevent permanent damage to the compressor unit.

The most common trigger for E:2051 is restricted airflow caused by lint accumulation inside the appliance. Heat pump dryers recirculate air through an internal loop, and lint buildup in the filters, heat exchanger, or internal ducting reduces airflow efficiency. When airflow is compromised, heat cannot be properly transferred away from the compressor, causing thermal overload. This is why the first diagnostic step is always to thoroughly clean the interior of the appliance from lint and fluff deposits.

Beyond lint buildup, the overheating condition can also result from a blocked condenser, a malfunctioning fan that circulates air across the heat exchanger, or an ambient room temperature that is too high for safe compressor operation. If lint cleaning does not resolve the fault, deeper inspection of the heat exchanger, evaporator coils, and the circulation fan motor is warranted. Persistent overheating despite clean filters may indicate a refrigerant pressure issue or a failing compressor, both of which require a qualified technician.

Source: manufacturer service documentation.

Common causes of E:2051

  1. 01

    Lint and fluff buildup inside the appliance

    Wiring / connection

    Accumulated lint in the filters, heat exchanger, or internal air passages restricts airflow and prevents the compressor from shedding heat effectively. Inspect and clean all accessible lint traps, the fine mesh filter, and the heat exchanger compartment.

  2. 02

    Blocked or dirty condenser/heat exchanger

    Wiring / connection

    The heat pump's evaporator and condenser coils can become coated with fine lint that escapes the filters, reducing their thermal transfer efficiency. These coils should be gently cleaned with a soft brush or low-pressure rinse if accessible.

  3. 03

    Circulation fan malfunction

    Part replacement

    The fan responsible for moving air across the heat exchanger may be running slowly or has failed, reducing airflow to the compressor. Listen for abnormal fan noise and check that the fan spins freely without obstruction.

  4. 04

    Excessive ambient room temperature

    Wiring / connection

    Heat pump dryers have a specified operating temperature range, and running the dryer in a room that is too warm can push the compressor into thermal overload. Ensure the laundry room is adequately ventilated and within the recommended ambient temperature range for the appliance.

  5. 05

    Failing or low-efficiency compressor

    Part replacement

    If all airflow and ventilation factors have been addressed and the error persists, the compressor itself may be degraded, have a refrigerant issue, or its thermal protection switch may be faulty. This condition requires a qualified technician with refrigeration certification.

See the test procedure for each cause

Frequently asked questions about E:2051

What does E:2051 mean on a Bosch dryer?
E:2051 is a compressor overheating error on Bosch heat pump dryers. It is the 4-digit version of fault code E:27. The error indicates that the compressor has reached an unsafe operating temperature, causing the dryer to shut down to protect the component. Lint buildup restricting internal airflow is the most frequent cause.
How do I fix the E:2051 error on my Bosch dryer?
Begin by powering off the dryer and cleaning all lint filters, the heat exchanger, and any accessible internal areas thoroughly. Allow the appliance to cool down for at least 30 minutes before restarting. If the error returns after cleaning and cooling, check that the room temperature is within the appliance's recommended operating range and inspect the circulation fan for obstructions or failure.
Will resetting my Bosch dryer clear the E:2051 error?
A basic reset may temporarily clear the code, but if the underlying cause such as lint buildup or a fan issue has not been resolved, the error will return during the next cycle. Always address the root cause before relying on a reset. Repeated overheating cycles can cause progressive damage to the compressor.
Is it safe to use my Bosch dryer when it shows E:2051?
No, you should not continue running the dryer while this fault is active. The error indicates the compressor has already reached an overheating threshold, and continued operation risks permanent damage to the compressor and potentially other heat pump components. Allow the unit to cool completely and resolve the cause before resuming use.
How much does it cost to repair a Bosch dryer with error E:2051?
If the fix is simply cleaning lint from the filters and heat exchanger, the repair costs nothing beyond your time. If a circulation fan motor needs replacement, parts and labor typically range from $100 to $250 depending on your location and service provider. A compressor replacement is significantly more expensive, often ranging from $300 to $600 or more, and in some cases replacement of the appliance may be more cost-effective.

Related Bosch dryer codes

All Bosch dryer codes
View all 94 Bosch dryer codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass