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Error code reference

Bosch Dryer Error Code E:2087

Compressor inverter

Bosch codesBosch dryer codes

Compressor inverter - blocked rotor (4-digit equivalent of E:29).

First step from the service manual

Check compressor windings and its electrical connections.

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

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What E:2087 means on a Bosch dryer

Error code E:2087 on a Bosch dryer indicates a blocked rotor condition within the compressor inverter system. This code is the 4-digit equivalent of E:29 and is specific to heat pump dryer models, which use a refrigerant-based compressor to generate drying heat rather than a conventional electric heating element. The inverter board controls the compressor motor by regulating the frequency and voltage supplied to it. When the inverter detects that the compressor rotor is not spinning as commanded, it triggers this fault to protect the system from damage.

A blocked rotor condition means the compressor motor shaft is either seized, stalled, or failing to reach the expected rotational state under power. This can result from a mechanically failed compressor, damaged motor windings with incorrect resistance values, or degraded electrical connections between the inverter board and the compressor terminals. Loose, corroded, or broken wiring at the compressor connector can cause intermittent or absent signal feedback, leading the inverter to report a blocked rotor even if the compressor itself is not fully seized.

The first diagnostic step is to inspect the compressor windings and all associated electrical connections. Winding resistance should be measured across each terminal pair and compared against specification. Open circuits, short circuits to ground, or significantly unbalanced resistance readings indicate internal compressor failure. If winding resistance checks out, focus on the wiring harness and connector integrity between the inverter board and the compressor before condemning either major component.

Source: manufacturer service documentation.

Common causes of E:2087

  1. 01

    Failed or seized compressor motor

    Part replacement

    The compressor motor may be internally seized or have burned-out windings, preventing rotation entirely. Measure resistance across all compressor terminal pairs to check for open circuits, shorts to ground, or imbalanced readings.

  2. 02

    Loose or corroded compressor wiring connections

    Wiring / connection

    Poor electrical contact at the compressor connector or along the harness between the inverter board and compressor can cause the inverter to detect a stall condition. Inspect all terminals for corrosion, looseness, or heat damage.

  3. 03

    Faulty compressor inverter board

    Part replacement

    If the inverter board is not delivering correct voltage or frequency signals to the compressor motor, it may falsely report a blocked rotor. This is typically diagnosed after the compressor windings and wiring have been confirmed good.

  4. 04

    Refrigerant system overpressure or restriction

    Part replacement

    A blocked refrigerant circuit can create excess back-pressure that mechanically resists compressor rotation, causing the motor to stall under load. This condition typically requires refrigerant system diagnostics by a certified technician.

See the test procedure for each cause

Frequently asked questions about E:2087

What does E:2087 mean on a Bosch dryer?
E:2087 is the 4-digit form of error code E:29 on Bosch heat pump dryers and indicates a blocked rotor condition in the compressor inverter system. This means the inverter board has detected that the compressor motor is not rotating as expected. The fault protects the system from damage caused by a stalled or seized compressor.
Can I fix E:2087 on my Bosch dryer myself?
Some causes of E:2087 are DIY-accessible, such as inspecting and reseating loose or corroded wiring connections at the compressor terminals. However, testing compressor winding resistance requires a multimeter and basic electrical knowledge. If the compressor itself or the refrigerant system is at fault, professional repair is required due to the complexity and specialized tools involved.
Is it safe to keep using my Bosch dryer when E:2087 is displayed?
No, you should not continue operating the dryer while this fault is active. The dryer has stopped functioning as a protective measure, and attempting to force operation with a seized or failing compressor could cause further damage to the inverter board or compressor. Leave the dryer off until the fault is properly diagnosed and resolved.
How much does it cost to repair a Bosch dryer showing E:2087?
Repair costs vary significantly depending on the root cause. If the issue is a wiring connection, the repair may cost relatively little beyond a service call fee, typically in the range of $75 to $150. Compressor replacement is a major repair on a heat pump dryer and can range from $400 to $800 or more including parts and labor. Inverter board replacement generally falls in the $200 to $500 range depending on parts availability.
Will resetting my Bosch dryer clear the E:2087 error?
A power reset may temporarily clear the fault code, but E:2087 will return if the underlying mechanical or electrical problem is not resolved. Because a blocked rotor condition points to a real component fault, resetting without diagnosing the compressor windings and connections is not a reliable fix. Repeated resets without repair can risk additional damage to the inverter board or compressor.

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