Error Code
medium
Convotherm C4 – Poor Cleaning Results
On your Convotherm 4 C4 floor-standing models unit, poor cleaning results typically…
Convotherm C4 - Error E23.3: Hot Air Cooking Modes Available in Emergency Mode
Caution / Monitor Closely
Warning: The information provided here is for educational purposes only.
Working with commercial kitchen equipment involves high voltage, gas, and high temperatures.
We strongly recommend contacting a certified service technician for any repairs.
We are not responsible for any damage or injuries resulting from DIY repair attempts.
This information is provided 'as is' without any guarantees of completeness or accuracy.
TLDR
On your Convotherm 4 C4 floor-standing models unit, error code E23.3 indicates the combi oven has entered an emergency operating mode. This typically means the unit cannot perform boiler pre-heating and cleaning cycles due to a detected fault, but allows limited hot air cooking functions to continue. Focus troubleshooting on the steam generation system and associated sensors or controls.
Technical Details
Repair Steps:
- Review Display Messages: Beyond E23.3, check for any accompanying warning or informational messages on the Convotherm 4 C4 display that might provide more specific details regarding the boiler or cleaning system.
- Verify Water Supply and Pressure: Ensure the unit has adequate water supply and pressure. Check that all water inlet valves are fully open and there are no kinks in the supply lines. Insufficient water pressure can prevent proper boiler filling and pre-heating.
- Inspect Steam Generator Water Level Sensor: The inability to pre-heat the boiler often points to issues with maintaining the correct water level. Locate and inspect the water level sensor (electrode) within the steam generator. Check for scale buildup, damage, or loose wiring. Clean any scale from the electrodes.
- Examine Steam Generator Heating Elements: If the boiler cannot pre-heat, the heating elements or their power supply might be faulty. Test the continuity and resistance of the boiler heating elements. Also, check the associated contactors or solid-state relays (SSRs) that supply power to these elements for proper operation.
- Check Boiler Overtemperature Safety Thermostat: A tripped overtemperature thermostat can prevent the boiler from heating. Locate the boiler overtemperature safety thermostat and check if it has tripped (some are resettable). Investigate why it might have tripped, such as a faulty water level sensor or heating element.
- Verify Steam Generator Temperature Sensor (NTC/PT1000): A faulty temperature sensor in the steam generator can give incorrect readings, preventing proper heating or triggering emergency mode. Test the resistance of the NTC or PT1000 temperature sensor and compare it to the manufacturer’s specifications at ambient temperature.
- Inspect Wiring and Connections: Carefully check all wiring and connectors related to the steam generator, water level detection, heating elements, and safety devices for looseness, corrosion, or damage.
- Cycle Power: As a basic reset, power down the Convotherm 4 C4 unit completely for at least 5 minutes, then power it back on. Observe if the error clears and if boiler pre-heating resumes.
- Consult Technical Documentation: Refer to the detailed wiring diagrams and service manual for your specific Convotherm 4 C4 floor-standing model to pinpoint the exact location and testing procedures for components related to boiler heating and water management.
- Professional Service: If the issue persists after these checks, or if you’re uncomfortable performing electrical diagnostics, contact a certified Convotherm service technician for advanced diagnostics and repair.
Common Questions:
Q: Why does my Convotherm 4 C4 enter emergency mode with E23.3?
A: Error E23.3 typically indicates a fault with the steam generation system or water supply, preventing proper boiler pre-heating and cleaning functions. The unit enters emergency mode to allow some basic hot air cooking.
Q: What does “No boiler pre-heating” mean for my Convotherm 4 C4?
A: “No boiler pre-heating” means the steam generator, which produces steam for combi cooking and cleaning, is unable to reach its operational temperature. This can be due to issues with water level, heating elements, sensors, or safety devices within the boiler system.
Q: Can I still use my Convotherm 4 C4 if error E23.3 is active?
A: Yes, in emergency mode with E23.3, your Convotherm 4 C4 will still allow hot air cooking functions like Hot air, Hot air Delta-T, and Cook&Hold. However, steam cooking and automatic cleaning cycles will not be possible until the underlying fault is resolved.
When to call a technician
Consider calling a certified technician if:
- The error keeps coming back after you've tried the steps above.
- You're not comfortable doing the checks or repairs yourself.
- You notice unusual noise, smell, or behaviour.
- Equipment is under warranty and you want official service.
- You need the unit back in service quickly with minimal downtime.