Error Code
medium
Convotherm C4 – Poor Cleaning Results
On your Convotherm 4 C4 floor-standing models unit, poor cleaning results typically…
Convotherm C4 - Error E99: Communications Dropped Out
Critical / Stop Operation
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 E99 signifies a loss of internal communication. Often, this is a temporary glitch that can be resolved by performing a full power cycle. Disconnect the oven from its power supply for about 10 seconds before restarting it.
Technical Details
Repair Steps:
- Initial Power Cycle: The first and most effective step for an E99 error is to perform a hard reset. Disconnect the Convotherm 4 C4 unit completely from its main power supply for approximately 10-15 seconds. This allows all internal components to de-energize and reset. After the wait, reconnect the power and restart the oven, observing if the E99 error clears.
- Check Power Supply and Connections: Ensure the oven’s power cord is securely plugged into the wall outlet and that the outlet itself is functional. For floor-standing models, also check the main electrical disconnect switch. Inspect the internal wiring, particularly connections to the control PCB and display PCB, for any loose or corroded terminals. Always ensure power is disconnected before inspecting internal wiring.
- Inspect Control Board and Display Board: If the power cycle doesn’t resolve the issue, the communication error might stem from faulty hardware. Carefully inspect the main control PCB and the display PCB for any visible damage, burnt components, or signs of liquid ingress. Also, check the ribbon cables or wiring harnesses connecting these boards for damage or improper seating. Reseat all critical communication cables.
- Review Communication Bus Wiring: The E99 error points directly to a communication failure. Identify the communication bus wiring (often a multi-wire cable or ribbon cable) that links the main control board to other critical sub-assemblies like the display, I/O boards, or motor control boards. Check for continuity in these wires and ensure their connectors are pristine and firmly seated. Damage to this wiring can interrupt data flow.
- Professional Diagnostic (Persistent Error): If the E99 error persists after these checks, it indicates a more serious underlying hardware failure. This could involve a defective control board, display board, or another component on the communication network. At this stage, professional diagnostic tools and expertise are required to pinpoint the exact faulty component. Contact a certified Convotherm service technician for advanced diagnostics and repair.
Common Questions:
Q: What exactly does “Communications dropped out” mean for my Convotherm 4 C4?
A: It indicates that the main control system has lost its ability to communicate with one or more critical internal components, such as the display, input/output boards, or motor controllers. This can be a temporary glitch or a sign of a hardware fault.
Q: Is it safe to continue using my Convotherm oven if the E99 error appears intermittently?
A: No, it is not recommended. An E99 error, even if intermittent, means critical internal systems are not reliably communicating. This can lead to unpredictable operation, unsafe conditions, or further damage. Always power cycle and, if the error persists, arrange for professional service.
Q: Can a power surge cause an E99 communication error?
A: Yes, power fluctuations or surges can sometimes disrupt the delicate electronic communication paths within the oven, leading to an E99 error. A power cycle often clears these transient issues, but repeated occurrences might suggest an unstable power supply or a component sensitive to voltage spikes.
When to call a technician
For this error, we recommend calling a certified technician. Do not continue operation or attempt repair yourself.
- Equipment shows a critical or stop-operation fault.
- You smell gas, burning, or see smoke or sparks.
- Error returns after following the steps above.
- You are not trained to work on this equipment.
- Warranty or safety could be affected by DIY repair.