Bosch Dishwasher: not heating, error code present, temperature exceeded

Professional Repair Guide

What is this symptom?

Experiencing issues with your Bosch dishwasher not heating water? If you're seeing an error code indicating a heating fault and your dishes come out cold or wet, it’s likely due to a faulty heating element, thermostat malfunction, or control board issues. Understanding these common problems can help in troubleshooting the heating failure effectively.

Urgency: Medium

Important Tips for Bosch Models

  • Bosch error codes such as E04 indicate heater electronics faults and often require service; reset may clear some errors. Specific codes like E09/E20 relate to internal heater faults.

Possible Causes

Faulty heating element

How to Identify: Error codes related to heating (e.g., E04, E09, E20 on Bosch; visible damage/corrosion on the heating element or no continuity when tested with a multimeter

Part: Heating element

Thermostat or temperature sensor malfunction

How to Identify: Dishwasher fails to trigger heating even though cycle should heat; temperature sensor shows out-of-spec resistance when measured

Part: Thermostat/temperature sensor

Control board or heater electronics fault

How to Identify: Specific Bosch error codes like E04 (faulty heater electronics or internal heater faults persist after reset

Part: Main control board / heater electronics

Wiring/connectivity faults

How to Identify: Loose, frayed, or disconnected wires near heater assembly; intermittent power to heating elements

Part: Wiring harness to heating element/thermostat

DIY Solutions

Reset dishwasher power

Easy 5 minutes
  1. Turn off dishwasher via breaker or unplug for 30 seconds
  2. Restore power and run a diagnostic cycle

Inspect and test the heating element

Advanced 30-60 minutes
Tools Needed: multimeter, screwdriver set
  1. Disconnect power to dishwasher at breaker
  2. Access the heating element (typically at the bottom interior)
  3. Visually inspect for breakage or corrosion
  4. Test heating element continuity with a multimeter; replace if no continuity
⚠️ Safety First: Ensure power is completely off before working on electrical components

Check thermostat/temperature sensor continuity

Advanced 30-60 minutes
Tools Needed: multimeter, screwdriver set
  1. Power off the dishwasher
  2. Locate thermostat/temperature sensor near the heating element
  3. Measure resistance and compare to expected values
  4. Replace sensor if readings are out-of-spec
⚠️ Safety First: Disconnect power fully before testing

Professional Repairs

Control board or heater electronics replacement

Estimated Cost: $200 - $500+

Professional wiring inspection and repair

Estimated Cost: $100 - $300

When to Call a Professional

Error codes related to heater electronics (e.g., E04, E09, E20) remain after reset
Dishwasher shows persistent no heat despite DIY heating element and thermostat checks
Internal wiring faults suspected

Preventive Maintenance

  • Run regular rinse aid and descaling cycles if in hard water area: Limescale build-up that can affect heater performance
    Frequency: monthly

Frequently Asked Questions

Why is my Bosch Dishwasher not heating, error code present, temperature exceeded?
The issue may stem from a faulty heating element, thermostat malfunction, control board error, or wiring faults.
How do I fix Bosch Dishwasher not heating, error code present, temperature exceeded myself?
Try resetting the power or inspect the heating element and thermostat for continuity and damage.
How much does it cost to fix not heating, error code present, temperature exceeded?
Professional repairs can range from $200 to $500+ for control board replacement, and $100 to $300 for wiring inspections.
When should I call a technician for not heating, error code present, temperature exceeded?
Consider calling a technician if DIY solutions don’t resolve the issue or if you suspect complex electrical faults.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

65%
DIY Success Rate Difficulty: Either

Common Issues Reported by Users

  • Faulty heating element
  • Defective temperature sensor
  • Malfunctioning control board

User Suggested Solutions

  1. Inspect and replace the heating element. Disconnect the dishwasher from power, remove the lower spray arm and cover, and test the heating element with a multimeter for continuity. If defective, replace it.

  2. Check and replace the temperature sensor. Access the sensor located near the heating element, disconnect the wiring, and use a multimeter to test for proper resistance. Replace if faulty.

  3. Diagnose and replace the control board. Inspect for burnt components or loose connections. If issues are found, replace the control board with a new one.

Analysis based on 1 community discussions
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. Bosch 800 Series Dishwasher

Community Discussions

heat pump failed, throwing error code, freezer exceeded temperature

new circuit boards needed, software update required

Pro needed View on Reddit →

Source: Reddit r/appliancerepair

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