Bosch Dishwasher Brush Light Flashing – Meaning, Causes & Fix
The flashing "brush" (or cleaning/filter) symbol on a Bosch dishwasher's control panel is a maintenance indicator that alerts the owner it's time to clean the appliance's filter system, rather than signaling an active mechanical fault. Bosch dishwashers use this icon, which resembles a small cleaning brush, to remind users at regular intervals that food particles and debris have likely accumulated in the removable filter assembly at the bottom of the tub, which can affect wash performance if left unaddressed. This guide explains what triggers this light and the correct filter cleaning procedure. For related indicators, see our Bosch Dishwasher Check Water Light guide and our Bosch Dishwasher Tap Symbol Flashing guide.
What it means
The dishwasher's maintenance reminder system has determined it's time to clean the removable filter assembly, based on cycle count or detected reduced water flow through the filter, not necessarily an active fault.
Severity
LowCan you fix it yourself?
Yes — the filter is designed to be removed and cleaned by the owner without any tools, typically taking just a few minutes.
Call a technician when
No technician visit is typically needed for this indicator alone; only relevant if the light persists after a thorough filter cleaning, suggesting a separate drainage or flow issue.
What Does Brush Light Flashing Mean?
Many Bosch dishwasher models include a triple-stage filtration system consisting of a coarse filter, fine filter, and micro-filter that collects food debris during each wash cycle to prevent it from being redeposited onto clean dishes or clogging the spray arms and drain pump.
The brush light is triggered by one of these mechanisms depending on the model:
1. Cycle-count based reminder: Some models simply track the number of completed wash cycles and illuminate this light after a set number (often around 30-50 cycles) as a routine maintenance prompt. 2. Reduced water flow detection: More advanced models actively monitor water flow through the filter system and trigger the light when flow drops below expected levels, indicating actual debris buildup. 3. Extended time since last filter clean: Some units also factor in elapsed time, prompting a clean even with lighter usage if enough time has passed.
Unlike active fault indicators such as the Bosch Check Water light, the brush light is a proactive maintenance prompt designed to prevent future performance issues rather than respond to a current fault.
What Causes This Error?
- Dishwasher has reached its programmed cycle count since the last filter clean (model-dependent, often 30-50 cycles)
- Reduced water flow detected through the filter system, indicating actual food debris buildup
- Extended time elapsed since the last filter cleaning, regardless of cycle count
- Heavy use with minimal pre-rinsing of dishes, accelerating filter debris accumulation
- Large food particles or labels/stickers from packaging caught in the filter assembly
- Filter not properly reseated after a previous cleaning, causing the system to continue flagging it
How to Fix Brush Light Flashing
- 1
Locate the filter assembly at the bottom of the tub. Open the dishwasher and remove the bottom rack to access the filter assembly, typically found in the center or rear-center of the tub floor, consisting of a cylindrical or dome-shaped filter that twists to unlock.
- 2
Twist and remove the filter components. Following your specific model's markings (usually a simple twist counterclockwise), remove the upper filter cylinder and the fine mesh filter beneath it, taking care to keep track of how the pieces fit together for reassembly.
- 3
Rinse all filter components thoroughly under running water. Use warm water and a soft brush (an old toothbrush works well) to remove trapped food particles, grease, and debris from all mesh surfaces and crevices of the filter assembly.
- 4
Check the sump area beneath the filter for debris. With the filter removed, look into the recessed sump area at the bottom of the tub for any large debris, glass shards, or food particles that may have settled there, and remove any found.
- 5
Reinsert and lock the filter components correctly. Reassemble the filter pieces in the correct order and twist to lock into place, ensuring it's fully seated and not sitting loose, which can affect both wash performance and the sensor's ability to clear the reminder.
- 6
Run a normal cycle to clear the reminder light. After reinstalling the filter, run the dishwasher through a standard cycle. On most models, the brush light clears automatically once the cycle-count is reset by the appliance's internal logic recognizing the maintenance was performed.
When to Call a Professional
This is a routine, owner-performed maintenance task that does not require professional service. If the brush light continues to flash after a thorough filter cleaning and a completed cycle, or if you notice food debris frequently redeposited on dishes despite regular filter cleaning, contact a Bosch technician to inspect the spray arms and drain pump for a separate underlying flow issue.
Can You Still Use the Device?
A Bosch dishwasher with the brush light flashing can continue to be used normally, as this is a maintenance reminder rather than a fault preventing operation. However, ignoring it for an extended period can lead to reduced wash quality, food particles redepositing on dishes, and potential clogging of the drain pump or spray arms over time, so cleaning the filter promptly is recommended.
Official Resources
Disclaimer: This article is for informational purposes only and does not constitute professional repair advice. CodeExplain is not affiliated with Bosch or any other brand mentioned. Always consult a qualified technician for complex repairs.