Error Code
medium
Convotherm C4 – Poor Cleaning Results
On your Convotherm 4 C4 floor-standing models unit, poor cleaning results typically…
Convotherm C4 - Error E28.2.3: 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 E28.2.3 signifies that the oven is operating in an emergency mode, allowing specific hot air cooking functions but disabling all cleaning capabilities. This typically points to an underlying fault within the cleaning system's water supply, drainage, or chemical dosing components. While cooking is possible, immediate diagnosis and repair are recommended to restore full functionality and prevent further issues.
Technical Details
Repair Steps:
- Check for Preceding Error Codes: This E28.2.3 status is often a secondary code triggered by a more specific underlying fault. Access the error log on your Convotherm 4 C4 to identify any other error codes that occurred concurrently or immediately prior to E28.2.3, as these will indicate the root cause.
- Inspect Water Supply and Pressure: Ensure the unit has adequate water supply pressure (typically 2.4 – 6.0 bar or 35 – 87 psi) and that the main water shut-off valve is fully open. Check and clean any inline water filters (e.g., in the water inlet hose or external pre-filter) for blockages that could restrict flow to the cleaning system.
- Verify Drain System Integrity: Examine the oven’s drain for any physical obstructions or blockages that could prevent proper water egress, especially during cleaning cycles. Ensure the drain hose is not kinked or crimped and that the internal drain valve is functioning correctly and can open/close without impediment.
- Evaluate Cleaning Agent Dosing System: For units with an automatic cleaning system, check the levels of both the Convotherm oven cleaner and rinse aid containers. Verify that the dosing pumps for these chemicals are operating, that their respective supply lines are clear of blockages, and that all connections are secure. A fault in the chemical delivery can prevent cleaning.
- Examine Cooking Chamber Sensors: Problems with the water level sensor or overflow sensor within the cooking chamber can trigger safety protocols that disable cleaning. Inspect these sensors for scale buildup or damage and clean them carefully if necessary. Ensure their wiring connections are secure.
- Perform a Unit Reset: After checking the above points, power cycle the Convotherm 4 C4 unit. Turn off the main power switch, wait for at least 30 seconds, and then turn it back on. This may clear temporary faults if the underlying issue has been resolved.
- Contact Certified Service Technician: If the error persists after performing these checks, or if other specific error codes were identified, it indicates a more complex internal fault potentially involving control boards, specialized sensors, or specific cleaning system components. Contact a RestoFixer certified technician for advanced diagnostics and repair.
Common Questions:
Q: What does E28.2.3 specifically mean on my Convotherm 4 C4?
A: Error E28.2.3 on Convotherm 4 C4 floor-standing models indicates the oven is in an emergency operating mode. While hot air cooking functions remain available, the automated cleaning system is disabled, signaling a problem with components critical to safe and effective cleaning.
Q: Can I continue cooking with E28.2.3 active on my Convotherm?
A: Yes, your Convotherm 4 C4 unit will continue to operate specific hot air cooking modes such as Hot air, Hot air Delta-T cooking, and Smoker functions. However, you will not be able to perform automatic cleaning cycles until the underlying issue causing the emergency mode is resolved.
Q: What are the common reasons for the cleaning function to be disabled with E28.2.3?
A: The most common reasons for cleaning functions to be disabled include insufficient water supply pressure, blockages in the drain system, malfunctions of the cleaning agent dosing pumps or supply lines, or issues with water level/overflow sensors within the cooking chamber.
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.