Bosch Factory Service ManualFault Code: Er2

Bosch Range/Oven Error Code Er2: Touch Keypad Membrane Button Shorted

The electronic clock timer control detects a continuously closed or shorted touch key for greater than 60 consecutive seconds.

Target Appliance

oven range

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: Turn off circuit breaker for 10 minutes to clear static charge and inspect glass control panel surface.

Bench Test: Check glass touch surface for liquid spillover, grease film, or trapped moisture around touch keys.

Expected Standard: Glass surface completely clean and dry.

If Failed / Out of Spec:

Clean surface with isopropyl alcohol, dry thoroughly, and restore power.

If Passed:

Proceed to Step 2.

Step 2: Physical & Electrical InspectionMultimeter & Visual

Action: Disconnect ribbon cable connecting touch membrane to electronic oven control (EOC) board.

Bench Test: Measure resistance across ribbon cable matrix traces with no keys touched.

Expected Standard: Infinity (open circuit) across all key matrix pairs when unpressed.

If Failed / Out of Spec:

Shorted membrane trace detected. Replace glass touch keypad assembly (00774235).

If Passed:

Proceed to Step 3.

Step 3: Physical & Electrical InspectionMultimeter & Visual

Action: Inspect ribbon cable connector socket on main control board for moisture, dust, or bent pins.

Bench Test: Inspect ribbon receptacle clamping latch for loose grip.

Expected Standard: Clean, tight connector latch gripping ribbon contacts securely.

If Failed / Out of Spec:

Clean receptacle with electronic contact cleaner or replace latch.

If Passed:

Proceed to Step 4.

Step 4: Physical & Electrical InspectionMultimeter & Visual

Action: If key matrix tests open but error returns immediately upon power restoration with ribbon plugged in.

Bench Test: Verify internal microprocessor key-scanning circuit on EOC board.

Expected Standard: Normal input scanning voltage (5V DC).

If Failed / Out of Spec:

Replace electronic oven control clock board (12009843).

If Passed:

Check ground wire connection from chassis to control board bracket.

Verified OEM Replacement Parts

Cross-referenced factory part numbers for Bosch oven-range error code Er2. Always replace defective components with authentic OEM parts to maintain UL safety certification.

Component Name	OEM Part Number	Manufacturer	Status
Glass Touch Keypad Control Panel	`00774235`	Bosch	Direct Fit OEM
Electronic Oven Clock Control Board (EOC)	`12009843`	Bosch	Direct Fit OEM
Control Board Mounting Bracket Assembly	`00654128`	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 Er2

What causes Bosch oven-range error code Er2?

The electronic clock timer control detects a continuously closed or shorted touch key for greater than 60 consecutive seconds.

Can I reset the Er2 code by unplugging the oven-range?

While disconnecting power for 5 minutes may temporarily clear the display control memory, the Er2 code will reoccur once the microcontroller detects the mechanical or electrical fault again.

What OEM replacement parts are required for Bosch Er2?

Common OEM replacement components include: Glass Touch Keypad Control Panel (OEM #00774235), Electronic Oven Clock Control Board (EOC) (OEM #12009843), Control Board Mounting Bracket Assembly (OEM #00654128).