Bosch Dishwasher Error Code E07

Bosch Dishwasher Error Code E07 — What it Means

E07 on a Bosch dishwasher generally signals a problem with the appliance’s water heating system or its temperature sensing circuit. In practice this means the dishwasher is not reaching or regulating the proper wash or rinse temperature. The result may be longer cycles, incomplete cleaning, poor drying performance, or the machine stalling mid-cycle. In some cases the fault can be caused by a failed heating element, a defective NTC temperature sensor (thermistor), a stuck relay on the control board, or damaged wiring. Left unaddressed, heating faults can increase energy usage, reduce cleaning and sanitizing effectiveness, and in rare electrical-failure cases create a safety risk. For most users the first observable impacts are longer run times, dishes that are still dirty or wet, and an error code displayed that prevents normal operation.

Common causes

• Failed or shorted heating element (no heat or intermittent heating)
• Defective NTC temperature sensor / thermistor giving incorrect readings
• Faulty relay or MOSFET on the control board that switches the heater
• Loose, corroded, or broken wiring/connectors between heater, sensor, and PCB
• Excessive limescale or deposits on the heating element reducing efficiency
• Software/firmware glitch or temporary electronics fault (rare)
• Low incoming water temperature or interrupted water supply (affects measured temperature)

Troubleshooting steps

1. Reset the dishwasher: switch off at the wall or breaker for 2–5 minutes, then power back on to see if E07 clears. This can resolve temporary control-board faults.
2. Confirm water supply and temperature: ensure cold or hot water supply is stable. Very cold inlet water can make the unit appear to be failing to reach temperature.
3. Run a diagnostic/service mode (if your model supports it): consult your manual for entering Bosch diagnostic mode to view heater and sensor readings and error history.
4. Visually inspect accessible wiring and connectors: look for burned insulation, loose plugs, or corrosion at the heater, sensor, and PCB connections. Power off before touching electrical parts.
5. Check the heating element for continuity: use a multimeter to test the element for a proper resistance value and for insulation to chassis (no short to ground). If it’s open or shorted, replace it.
6. Test the NTC thermistor/sensor: measure resistance and compare to your model’s service data at room temperature. An open, shorted, or wildly incorrect reading indicates replacement is needed.
7. Inspect the control board and relay: if the board is not switching the heater (no voltage output when heat is called), the PCB or its relay/MOSFET may be faulty. Burn marks or swollen components indicate board failure.
8. Descale if heavy limescale is present: buildup on the heating element reduces performance and can lead to repeated faults. Use a suitable descaler according to Bosch recommendations.
9. Swap suspect parts only after confirming diagnosis: replace the part that fails testing (element, sensor, wiring, or PCB). Always use OEM or equivalent Bosch-compatible parts.
10. If in doubt or if the repair requires mains access, stop and call a qualified appliance technician. Working on dishwasher mains circuits and water connections can be hazardous.

Maintenance / Prevention Tips

• Run a cleaning cycle with a Bosch-approved dishwasher cleaner every 1–3 months to limit scale and residue.
• Use rinse aid and correct detergent amounts to avoid build-up on heating components.
• Install a water softener or use descaler tablets in hard-water areas to reduce limescale on the element.
• Avoid using overly high-temperature cycles unless needed; excessive repeated thermal stress can shorten component life.
• Inspect and tighten electrical connectors during annual maintenance to prevent intermittent faults.
• Keep the dishwasher dry between long unused periods to reduce corrosion on contacts.
• Do not overload or block spray arms — poor water circulation can make the unit run longer and strain heating cycles.
• Replace worn door seals to prevent leakage that can affect electronics in some models.
• Address small leaks immediately — moisture near the control area can corrode boards and connectors.
• Always use Bosch- or OEM-recommended parts for replacements to ensure compatibility and reliability.
• Schedule a professional service check every 2–3 years if you use the dishwasher heavily.

FAQs

Conclusion / Safety Notice

When E07 appears on a Bosch dishwasher it usually points to heating or temperature-sensing problems that affect cleaning and drying performance. Because the fault often involves mains-power components (heater, relays, control board), proceed with caution. Always disconnect power before inspecting internal parts. If you are not confident with electrical diagnosis or the fault requires replacing the heating element or PCB, contact a qualified Bosch service technician. Professional repair reduces risk and helps ensure the right parts and procedures are used.

For persistent E07 errors or if you detect burning smells, visible damage, or repeated failures after basic troubleshooting, stop using the unit and call a professional appliance repair service.