mypros+
Error code reference

Bosch Washer Error Code Er:16

Spinning aborted due to unbalanced load

Bosch codesBosch washer codes

Spinning aborted due to unbalanced load — unbalanced load or faulty wire harness.

First step from the service manual

Run test P4; redistribute load or check wire harness.

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 Er:16.

  • 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 Er:16 means on a Bosch washer

Er:16 on a Bosch washer indicates that the spin cycle was aborted because the control system detected an unbalanced load. During the spin phase, the machine monitors drum movement and motor feedback to assess load distribution. When the imbalance exceeds an acceptable threshold, the washer halts spinning to prevent excessive vibration, structural stress, and potential damage to internal components such as bearings, the drum support spider, or shock absorbers.

The two primary causes identified for this error are an unevenly distributed load inside the drum and a fault in the wire harness. A tangled or bunched load, particularly with heavy items like towels or jeans, can cause the drum to wobble erratically at spin speeds. On the electrical side, a damaged, corroded, or loose wire harness can send erratic or absent signals from sensors involved in spin monitoring, causing the control board to incorrectly interpret normal operation as an imbalance condition.

Diagnosis should begin with test P4, which is a specific diagnostic routine used to evaluate spin-related functions on this platform. If the machine passes P4 and the error clears, the root cause is likely a one-time load distribution issue. If the error persists through P4, attention should shift to a physical inspection of the wire harness, checking for continuity, secure connector seating, and signs of wear or chafing along the harness routing path.

Source: manufacturer service documentation.

Common causes of Er:16

  1. 01

    Unbalanced or tangled laundry load

    Wiring / connection

    Heavy items like jeans, towels, or blankets can clump together on one side of the drum during spin, causing excessive wobble. Redistributing items evenly and restarting the spin cycle often resolves the error immediately.

  2. 02

    Overloaded drum

    Wiring / connection

    Packing too many items into the drum prevents clothes from redistributing themselves during the spin ramp-up phase, making balance impossible to achieve. Removing some items and splitting into two loads is the recommended fix.

  3. 03

    Faulty or damaged wire harness

    Part replacement

    A wire harness with broken connections, chafed insulation, or a loose connector can disrupt sensor signals related to spin monitoring, causing the control board to trigger Er:16 even when the load is properly balanced. A visual inspection and continuity check of the harness is required.

  4. 04

    Worn or failed shock absorbers

    Part replacement

    If the shock absorbers that dampen drum movement have degraded, the drum will oscillate more aggressively than normal during spin, and the control system may interpret this as an imbalance. Worn shocks are usually accompanied by loud banging noises during the spin phase.

  5. 05

    Machine not level

    Wiring / connection

    If the washer is not sitting evenly on the floor, even a reasonably balanced load can cause enough drum oscillation to trigger the unbalance cutoff. Checking and adjusting all four leveling feet to ensure the machine is stable on a flat surface can eliminate this cause.

See the test procedure for each cause

Frequently asked questions about Er:16

What does Er:16 mean on a Bosch washer?
Er:16 means the washer aborted the spin cycle because it detected an unbalanced load in the drum. The machine does this to protect itself from vibration damage. The cause can be as simple as laundry bunched up on one side, or it can point to a faulty wire harness affecting the spin monitoring system. Running diagnostic test P4 is the recommended first step to narrow down the cause.
How do I fix Er:16 on my Bosch washer?
Start by opening the door, redistributing the laundry so items are spread evenly around the drum, and restarting the spin cycle. If the error returns repeatedly with normal loads, run the P4 diagnostic test to assess spin system function. If P4 reveals a fault, inspect the wire harness for loose connectors, corrosion, or physical damage. Persistent errors after load redistribution typically point to a harness or component issue requiring hands-on repair.
Is it safe to keep using my Bosch washer when Er:16 appears?
The washer is designed to stop spinning when it detects an imbalance, so the error code itself is a protective function. Continuing to force spin cycles with an underlying mechanical or wiring fault could worsen damage to bearings, the drum, or the control system. It is safe to attempt one or two restarts after redistributing the load, but repeated occurrences should be diagnosed before continuing regular use.
Will resetting my Bosch washer clear the Er:16 code?
A reset may clear the code temporarily if the error was triggered by a one-time load imbalance. However, if the underlying cause is a damaged wire harness, worn mechanical components, or a consistent loading habit, the error will return during the next spin attempt. A reset alone is not a fix, and the P4 diagnostic test should be run if the error reappears.
How much does it cost to repair a Bosch washer showing Er:16?
If the fix is simply redistributing the laundry, there is no cost involved. If the wire harness needs replacement, parts and labor can range from around 100 dollars to 300 dollars depending on the specific harness section and local labor rates. If the cause turns out to be worn shock absorbers or other mechanical components, costs can vary in a similar range depending on parts required and service fees.

Related Bosch washer codes

All Bosch washer codes
View all 123 Bosch washer codes

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

Get Started

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