Bosch Factory Service ManualFault Code: E08

Bosch Dryer Error Code E08: Condensate Drain Pump / Reservoir Overflow

On ventless heat-pump and condensation dryers, the water reservoir float switch detects excessive liquid that the condensate pump failed to evacuate.

Target Appliance

dryer

OEM Certified Technical Diagnostic Tree

Diagnostic Tool Required

Digital Multimeter

Measure Ohms resistance, continuity & line voltage.

Triage Complexity

Advanced Diagnostic

4 Sequential manufacturer inspection branches.

Sequential Factory Diagnostic Tree

Perform each diagnostic step in order. Disconnect electrical power and turn off utility shutoffs before inspecting wiring or internal mechanical assemblies.

Step 1: Physical & Electrical InspectionMultimeter & Visual

Action: Remove condensate water drawer and check if tank is filled to capacity.

Bench Test: Empty container and ensure drainage port spout is not occluded with lint slime.

Expected Standard: Container empty, drain port unobstructed.

If Failed / Out of Spec:

Empty and clean water container drawer.

If Passed:

Proceed to Step 2.

Step 2: Physical & Electrical InspectionMultimeter & Visual

Action: Remove rear lower service panel to inspect the bottom condensate pump sump basin.

Bench Test: Inspect sump basin for accumulated wet lint paste jamming the pump impeller.

Expected Standard: Sump clean, pump impeller rotates freely without friction.

If Failed / Out of Spec:

Clean sump basin thoroughly and flush with warm water.

If Passed:

Proceed to Step 3.

Step 3: Physical & Electrical InspectionMultimeter & Visual

Action: Test electrical resistance across condensate pump motor terminals.

Bench Test: Disconnect pump harness and measure resistance across motor terminals with multimeter.

Expected Standard: Normal winding resistance is 120 to 160 ohms.

If Failed / Out of Spec:

Open or shorted motor windings. Replace condensate drain pump (00654408).

If Passed:

Proceed to Step 4.

Step 4: Physical & Electrical InspectionMultimeter & Visual

Action: Inspect condensate float microswitch mounted in the lower sump basin.

Bench Test: Measure continuity across switch contacts when float is at bottom vs elevated.

Expected Standard: Open circuit when down; 0 ohms continuity when float is raised.

If Failed / Out of Spec:

Replace condensate float microswitch assembly (00624026).

If Passed:

Replace main power control board (11006842).

Verified OEM Replacement Parts

Cross-referenced factory part numbers for Bosch dryer error code E08. Always replace defective components with authentic OEM parts to maintain UL safety certification.

Component Name	OEM Part Number	Manufacturer	Status
Ventless Condensate Drain Pump Motor	`00654408`	Bosch	Direct Fit OEM
Condensate Sump Float Microswitch	`00624026`	Bosch	Direct Fit OEM
Condensate Drain Hose Kit	`00646776`	Bosch	Direct Fit OEM

Need Local Diagnostic Assistance?

Connect with a Certified Bosch Technician in Your Area

If multimeter testing reveals an internal short, locked motor, or fried control board, let an experienced local technician complete the repair with certified OEM replacement parts.

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Frequently Asked Questions: Bosch E08

What causes Bosch dryer error code E08?

On ventless heat-pump and condensation dryers, the water reservoir float switch detects excessive liquid that the condensate pump failed to evacuate.

Can I reset the E08 code by unplugging the dryer?

While disconnecting power for 5 minutes may temporarily clear the display control memory, the E08 code will reoccur once the microcontroller detects the mechanical or electrical fault again.

What OEM replacement parts are required for Bosch E08?

Common OEM replacement components include: Ventless Condensate Drain Pump Motor (OEM #00654408), Condensate Sump Float Microswitch (OEM #00624026), Condensate Drain Hose Kit (OEM #00646776).