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Error code reference

Bosch Dryer Error Code E:2081

Compressor inverter

Bosch codesBosch dryer codes

Compressor inverter - under voltage (4-digit equivalent of E:22).

First step from the service manual

Check mains voltage.

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

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What E:2081 means on a Bosch dryer

Error code E:2081 on a Bosch dryer indicates an under-voltage condition detected at the compressor inverter. This code is the 4-digit equivalent of E:22 and is specific to heat pump dryers, which use a refrigerant compressor driven by an inverter board rather than a traditional heating element. The inverter board converts incoming AC mains power to a controlled DC or variable-frequency AC output to drive the compressor motor. When the voltage supplied to the inverter falls below the acceptable operating threshold, the inverter shuts down the compressor and triggers this fault to prevent damage to the compressor motor and inverter components.

The most direct cause of E:2081 is insufficient mains voltage reaching the appliance. This can stem from a weak or fluctuating supply from the electrical grid, an undersized or failing circuit, a loose connection at the wall outlet or terminal block, or a deteriorating power cord. Internally, a failing power filter board or a fault in the primary rectifier section of the inverter itself can also produce a low-voltage condition at the inverter's DC bus. The first diagnostic step is always to measure the actual mains voltage at the outlet using a multimeter to confirm it falls within the required range for the appliance before investigating internal components.

Source: manufacturer service documentation.

Common causes of E:2081

  1. 01

    Low or fluctuating mains supply voltage

    Wiring / connection

    The incoming voltage from the wall outlet or electrical panel is below the dryer's required operating range. Measure the outlet voltage with a multimeter during operation to confirm a stable, adequate supply.

  2. 02

    Loose or corroded power connection

    Wiring / connection

    A loose plug at the wall outlet, a corroded socket, or a poorly terminated connection at the dryer's terminal block can cause voltage drop under load. Inspect the plug, outlet, and internal wiring connections for signs of arcing or corrosion.

  3. 03

    Failing or undersized circuit wiring

    Wiring / connection

    If the circuit supplying the dryer is shared with other high-draw appliances or has aging wiring, voltage can sag when the compressor starts. An electrician should evaluate the dedicated circuit capacity and wiring condition.

  4. 04

    Faulty power filter board

    Part replacement

    The internal power filter board conditions incoming mains power before it reaches the inverter. A failed component on this board can cause reduced voltage at the inverter input even when mains supply is normal.

  5. 05

    Defective compressor inverter board

    Part replacement

    If the inverter board's internal rectifier or voltage monitoring circuitry has failed, it may incorrectly detect or actually produce an under-voltage condition at the DC bus. Replacement of the inverter board is required if all upstream voltage checks are normal.

See the test procedure for each cause

Frequently asked questions about E:2081

What does E:2081 mean on a Bosch dryer?
E:2081 indicates that the compressor inverter has detected an under-voltage condition. It is the 4-digit form of error E:22 and is found on Bosch heat pump dryers. The inverter board has shut down the compressor because the voltage it received fell below a safe operating level. The first step is to check that the mains supply voltage at the wall outlet is adequate and stable.
Can I fix E:2081 myself, or do I need a technician?
Some causes are DIY-friendly, such as checking and reseating the power plug, testing the outlet voltage with a multimeter, or ensuring no other high-draw appliances share the circuit. If the mains voltage is correct and the fault persists, internal components like the power filter board or inverter board are involved, and a qualified technician should perform those repairs.
Is it safe to keep using the dryer when E:2081 is displayed?
No. The dryer has stopped operation intentionally to protect the compressor and inverter from damage caused by low voltage. Attempting to force operation under low-voltage conditions can cause overheating or permanent damage to the inverter board and compressor. The fault should be diagnosed and resolved before running the dryer again.
Will resetting the dryer clear the E:2081 error?
A power cycle may temporarily clear the code, but if the underlying voltage issue has not been corrected, the error will return during the next cycle. A reset is only useful as a final step after the root cause, such as low mains voltage or a loose connection, has already been addressed.
How much does it cost to repair a Bosch dryer showing E:2081?
If the fix is simply tightening a connection or addressing a supply voltage issue, costs may be limited to an electrician's service call, typically in the range of $75 to $150. If the power filter board or compressor inverter board needs replacement, parts and labor combined can range from $200 to $500 or more depending on the specific model and your location.

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