Common Heating Issues
Typical Heating Problems:
- Dishes not drying properly
- Water not heating during cycle
- Longer than usual cycle times
- Error codes related to heating system
- Inconsistent water temperature
Initial Quick Checks
- Check Water Temperature: Ensure incoming water is at least 60°C for optimal performance.
- Verify Settings: Confirm Eco or Intensive programs are selected for heating.
- Inspect Loading: Ensure dishes are loaded correctly to allow proper water circulation.
- Check Detergent: Use recommended dishwasher detergent in proper quantity.
- Verify Power Supply: Ensure dishwasher is properly connected to power source.
- Rinse Aid Check: Confirm rinse aid dispenser is filled for better drying results.
- Filter Inspection: Clean filters to ensure proper water flow and heating.
Diagnostic Steps
Model Series | SMS40C02GB |
Heating Element Type | Stainless Steel Tubular Heater |
Power Rating | 2100W |
Voltage Requirements | 220-240V, 50Hz |
Operating Temperature | 45-70°C |
Heating Element Resistance | 22-26 ohms (cold) |
Thermostat Cut-out | 85°C |
Heating Time | 8-15 minutes to reach 65°C |
Step-by-Step Diagnosis
- Visual Inspection: Check heating element for visible damage, burns, or corrosion
- Continuity Test: Use multimeter to test heating element continuity (should show 22-26 ohms)
- Thermostat Check: Test thermal cut-out and temperature sensors for proper operation
- Control Board Test: Verify control board is sending proper voltage to heating circuit
- Water Level Check: Ensure proper water level for heating element immersion
- Wiring Inspection: Check all connections to heating element and thermal sensors
Heating Error Codes
Error Code | Description | Solution |
---|---|---|
E09 | Heating system fault - temperature not rising | Check heating element, thermostat, temperature sensor |
E15 | Overheating protection activated | Check thermostat, cooling system, water circulation |
E22 | NTC temperature sensor fault | Replace temperature sensor, check wiring |
E24 | Heating time exceeded | Check heating element, water inlet temperature |
E25 | Heating circuit short circuit | Check heating element for short, replace if necessary |
E26 | Heating circuit open circuit | Check heating element continuity, replace if broken |
Temperature Sensor Specifications
- Type: NTC Thermistor
- Resistance at 25°C: 10k ohms
- Temperature Range: 0-100°C
- Accuracy: ±1°C
- Location: Bottom of tub near heating element
Heating Components
Heating Element
2100W stainless steel tubular heating element located at the bottom of the wash tub. Responsible for heating water during wash cycles and aiding in drying process.
Temperature Sensor
NTC thermistor that monitors water temperature and provides feedback to the control board for precise temperature regulation throughout the wash cycle.
Thermal Cut-out
Safety device that disconnects power to the heating element if temperature exceeds safe limits (85°C), preventing overheating and potential damage.
Control Board
Main electronic controller that manages heating cycles, monitors temperature sensors, and activates safety protocols in case of heating system faults.
Heating Relay
Electromechanical relay on the control board that switches high current to the heating element based on commands from the microprocessor.
Wiring Harness
High-temperature resistant wiring that connects the heating element to the control board and power supply, designed to withstand moist, hot environments.
Replacement Parts Information
Heating Element
Part No: 00611978 - 2100W stainless steel heating element
Temperature Sensor
Part No: 00645094 - NTC temperature sensor 10k ohm
Thermal Cut-out
Part No: 119476 - 85°C thermal safety switch
Heating Relay
Part No: 00563569 - 16A relay for heating circuit
Wiring Set
Part No: 00611913 - Complete heating circuit wiring harness
Control Board
Part No: 00644253 - Main electronic control unit
Technical Downloads
Bosch SMS40C02GB Documents
Service Manual
Complete technical service manual
Wiring Diagram
Electrical schematics and wiring
Parts Catalog
Complete parts list and diagrams
Error Code Guide
Complete error code reference
Related Model Documents
SMS40C02GB
User Manual & Installation
SMS40C02GC
Similar Model Guide
SMS44GW00G
Related Series Manual
SMS46GW01G
Advanced Model Guide