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OEM VERIFIED BENCH
OFFICIAL FAULT CODEE845
Bosch
Bosch // OFFICIAL DIAGNOSTIC BENCH

Bosch E845

OvenWater Level Pressure Switch & Air Dome
Integrated luxury convection oven and induction cooktop with illuminated touch controls
Oven
Other Brands Sharing Code E845:SiemensE845NeffE845GaggenauE845

Symptom / Description

FAULT

Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Combi-steam boiler water level optical sensor calibration failure E845; steam generator cannot verify boiler water level.

TELEMETRY // LIVESIG: FAULT_DETECTED

Root Cause

ROOT CAUSE

On Bosch ovens: Heavy lime scale coating optical refraction prism inside steam generator, defective optocoupler, or empty water reservoir tank.

CIRCUIT // SUBSYSTEMLOGIC: ROOT_ISOLATED

Repair Instructions

UNLOCKED
1Run automatic oven descaling program with recommended descaling liquid. Remove boiler unit and clean optical glass prism. Verify water pump flow. Turn function selector to 0, isolate power at circuit breaker for 60 seconds, restore power and set the digital clock.
AI diagnostic workshop engine analyzing appliance circuit schematics and error telemetry in real time
AI WORKSHOP PROTOCOL ENGINE
Direct extraction from OEM factory manuals & wiring schematics

Field Actions

DISPATCH
Need Help? Call a Certified TechnicianWorldwide Bosch Parts Finder
Electrical & Safety Protocol

Always disconnect appliance from 230V/400V mains before opening panels. Use CAT III multimeter for circuit testing.

CALIBRATED BENCH PROTOCOL // CAT III 600V

Workshop Verification & Safety Checklist

WORKSHOP VERIFICATION PROTOCOLWater Level Pressure Switch & Air DomeOven / Microwave
2. Multimeter & Electrical Bench Tests (Ω)
MODE: OHMMETER (Ω)AUTO-RANGE
Precision digital multimeter probes measuring electrical resistance in Ohms on an appliance control board
CALIBRATED METROLOGY RESISTANCE BENCH (CAT III)
Nominal Resistance (Ω)
Mechanical: Continuity 0.0Ω–0.2Ω (Empty: 11-12, Full: 11-14). Electronic: 20Ω–45Ω coil resistance.NOMINAL
0 Ω (SHORT)CALIBRATED BAND∞ OL (OPEN)
▲ NOMINAL OPERATING WINDOW
Target Component:Mechanical Pressure Switch Contacts / Inductive Frequency Sensor
Test Pins & Connections
PROBE (+)
PROBE (-)
Across switch spade contacts with harness unplugged; electronic output: 40Hz–50Hz frequency signal
Tolerance & Diagnostic CriteriaMechanical switch contacts must transition cleanly on gentle breath pressure. Coil ~22Ω ±5%.
1. Pre-Intervention Electrical Safety Protocols
  • !Electrical Safety Protocol: Cut 230V mains power before accessing the upper chassis or pressure switch terminals.
  • !Drain appliance tub completely before disconnecting pressure switch sensing hoses.
  • !Never blow high-pressure compressed air into electronic analog pressure sensors: internal diaphragms will rupture!
3. Preliminary Mechanical & Visual Checks
  • Disconnect the silicone pressure tube from the lower air trap and inspect for soap sludge, lint, or water blockage.
  • Inspect the flexible rubber hose along its entire length for pinholes, cracks, or loose clamp fit.
  • Thoroughly flush the lower compression chamber (air dome) with hot water to dissolve detergent buildup.
Perform these diagnostic steps before triggering AI Deep Search or replacing boards.Certified Workshop Routine

Frequently Asked Questions: Bosch E845

FAQ TREE
What does error code E845 mean on a Bosch appliance?

Bosch error code E845 indicates: Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Combi-steam boiler water level optical sensor calibration failure E845; steam generator cannot verify boiler water level..

What is the root cause of Bosch error code E845?

The primary root cause for Bosch code E845 is: On Bosch ovens: Heavy lime scale coating optical refraction prism inside steam generator, defective optocoupler, or empty water reservoir tank..

How do I fix or resolve Bosch error code E845?

To resolve error code E845: Run automatic oven descaling program with recommended descaling liquid. Remove boiler unit and clean optical glass prism. Verify water pump flow. Turn function selector to 0, isolate power at circuit breaker for 60 seconds, restore power and set the digital clock.

Is it safe to clear Bosch error code E845 by resetting power?

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Bosch code E845 persists, the physical component causing On Bosch ovens: Heavy lime scale coating optical refraction prism inside steam generator, defective optocoupler, or empty water reservoir tank. must be inspected or replaced.

How do I test electrical resistance for Bosch code E845 using a multimeter?

Set a digital multimeter to ohms (Ω). Disconnect power and test Mechanical Pressure Switch Contacts / Inductive Frequency Sensor across Across switch spade contacts with harness unplugged; electronic output: 40Hz–50Hz frequency signal. Expected nominal reading is Mechanical: Continuity 0.0Ω–0.2Ω (Empty: 11-12, Full: 11-14). Electronic: 20Ω–45Ω coil resistance.. Tolerance: Mechanical switch contacts must transition cleanly on gentle breath pressure. Coil ~22Ω ±5%..

What safety protocol must be followed before servicing Bosch code E845?

Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.

Community Verification

COMMUNITY

Did this solution resolve the issue?

SEMANTIC KNOWLEDGE GRAPH // BOSCH

Related Bosch Oven / Microwave Error Codes

Diagnostic Link Mesh14 OEM Cross-References

Cross-referenced diagnostic codes for technicians inspecting similar component subsystems.

Er 0Electronic Control Board (PCB) & Bus Communications
Incorrect module combination detected, no further operation possible.
Inspect Protocol
Er 1NTC Temperature Sensor & Thermistor
Temperature sensor interruption detected, oven does not heat, fans turn on.
Inspect Protocol
Er 11General System & Mechanical Integration
Bosch ER 11: Operational cycle fault detected during Oven / Microwave program execution.
Inspect Protocol
Er 15Heating Element, Thermostat & Safety Fuse
Oven is too hot, heating elements switched off, oven locked.
Inspect Protocol
Er 2General System & Mechanical Integration
Incorrect mains connection, continuous buzzer tone, mains connection incorrect
Inspect Protocol
Er 3Heating Element, Thermostat & Safety Fuse
Electronics overheated (> 100 °C), no heating, display darker, cooling fan on
Inspect Protocol
Er 4NTC Temperature Sensor & Thermistor
Temperature sensor short circuit detected, oven does not heat.
Inspect Protocol
Er 5Electronic Control Board (PCB) & Bus Communications
No clock function, no function in program position 'P'
Inspect Protocol
Er 6Door Lock Mechanism & Safety Interlock
Oven door does not lock, pyrolysis operation is no longer possible.
Inspect Protocol
Er 7Drive Motor, Inverter & Tachometer Sensor
The oven door fails to unlock and normal cooking operation is blocked.
Inspect Protocol
ER 9Heating Element, Thermostat & Safety Fuse
ROM check error after reset, all heating elements switched off.
Inspect Protocol
Er1NTC Temperature Sensor & Thermistor
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Cavity PT1000 thermocoup...
Inspect Protocol
Er2General System & Mechanical Integration
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Mains connection frequen...
Inspect Protocol
Er4Door Lock Mechanism & Safety Interlock
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Electronic module compar...
Inspect Protocol
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