Bosch Factory Service ManualFault Code: E09

Bosch Dishwasher Error Code E09: Heating Circuit Failure / Heat Pump Element Open

The integrated flow-through heating element inside the main wash circulation heat pump has suffered an open circuit or burned internal resistive trace.

Target Appliance

dishwasher

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: Disconnect dishwasher power, remove right-side panel and base access cover to expose the wash heat pump assembly.

Bench Test: Unplug the 3-pin heating connector from heat pump and measure resistance across the two main heater terminals using a digital multimeter set to 200 ohms.

Expected Standard: Normal resistance is between 19.0 and 24.0 ohms at room temperature (70°F).

If Failed / Out of Spec:

Resistance reads 0L / infinity (open circuit). Replace wash heat pump heater assembly (12008381).

If Passed:

Proceed to Step 2.

Step 2: Physical & Electrical InspectionMultimeter & Visual

Action: Inspect the integrated NTC dual-thermistor sensor terminals on the heat pump casing.

Bench Test: Measure resistance across both NTC thermistor pairs at room temperature (77°F).

Expected Standard: Approximately 10,000 ohms (10k) per thermistor pair, dropping as temperature rises.

If Failed / Out of Spec:

Thermistor circuit drifted or open. Replace heat pump assembly (12008381).

If Passed:

Proceed to Step 3.

Step 3: Physical & Electrical InspectionMultimeter & Visual

Action: Inspect the heavy-gauge red heater wiring harness from heat pump to the main power module in rear base.

Bench Test: Perform end-to-end continuity check on heater power leads and inspect spade terminals for heat discoloration or melting.

Expected Standard: 0 ohms continuity; clean copper pins with zero oxidation or melting.

If Failed / Out of Spec:

Repair harness wiring harness or replace power lead connector (00624026).

If Passed:

Proceed to Step 4.

Step 4: Physical & Electrical InspectionMultimeter & Visual

Action: Inspect the main control power module located in the right lower rear base casing.

Bench Test: Examine heater relay solder joints on the circuit board for brown burn marks or desoldered relay pins.

Expected Standard: Relays intact, no scorched board traces, relay coils energize on 12V test.

If Failed / Out of Spec:

Replace main power control module (11028637).

If Passed:

Clear control error log via service diagnostic test cycle.

Verified OEM Replacement Parts

Cross-referenced factory part numbers for Bosch dishwasher error code E09. Always replace defective components with authentic OEM parts to maintain UL safety certification.

Component Name	OEM Part Number	Manufacturer	Status
Wash Heat Pump Circulation Motor Assembly	`12008381`	Bosch	Direct Fit OEM
Main Electronic Power Control Module	`11028637`	Bosch	Direct Fit OEM
Sump Heat Pump Connecting Hose & Clamp	`00624026`	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 E09

What causes Bosch dishwasher error code E09?

The integrated flow-through heating element inside the main wash circulation heat pump has suffered an open circuit or burned internal resistive trace.

Can I reset the E09 code by unplugging the dishwasher?

While disconnecting power for 5 minutes may temporarily clear the display control memory, the E09 code will reoccur once the microcontroller detects the mechanical or electrical fault again.

What OEM replacement parts are required for Bosch E09?

Common OEM replacement components include: Wash Heat Pump Circulation Motor Assembly (OEM #12008381), Main Electronic Power Control Module (OEM #11028637), Sump Heat Pump Connecting Hose & Clamp (OEM #00624026).