Error Code
high
Unox HOOD – Error WC07: Lack of Communication Warning
On your CHEFTOP and BAKERTOP MIND.Maps™ unit, error code WC07 indicates a…
Unox HOOD - Error WC05: Fumes Temperature Warning
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 CHEFTOP and BAKERTOP MIND.Maps™ unit, error code WC05 indicates an excessively high fumes temperature, which can signal a critical safety or operational issue. This typically points to inadequate exhaust ventilation, a faulty fumes temperature sensor, or a combustion problem in gas models. Immediate investigation and resolution are necessary to prevent potential damage or unsafe operating conditions.
Technical Details
Repair Steps:
- Inspect the Exhaust Flue and Fan: Thoroughly check the oven’s exhaust flue for any obstructions (e.g., grease buildup, debris, nesting materials) that could impede airflow. Verify that the external exhaust fan (if applicable) is operational and that its ducting is clear. Ensure the oven’s internal exhaust fan is spinning freely and not obstructed.
- Test the Fumes Temperature Sensor: Locate the fumes temperature sensor, typically positioned near the exhaust outlet. Disconnect it and perform a resistance check using a multimeter; consult the Unox service manual for expected resistance values at room temperature and as it heats up. A reading outside the specified range indicates a faulty sensor. Also, check the sensor’s wiring for any signs of damage or loose connections.
- Verify Exhaust Fan Motor Operation: With the oven powered off and safely isolated, physically check the exhaust fan motor for any signs of seizure or excessive play. Apply power briefly (if safe to do so) to confirm the fan motor spins vigorously. If it’s weak or non-responsive, the motor or its capacitor may need replacement.
- Examine Combustion System (Gas Models Only): For gas-powered units, a high fumes temperature can be a symptom of improper combustion. This could be due to a dirty burner, incorrect gas-to-air mixture, or a faulty igniter/flame sensor leading to inefficient burning. This step requires a qualified gas technician to inspect and service.
- Check Control Board Connections: Power down the unit and disconnect it from the main supply. Access the main control board and inspect all connectors related to the exhaust system and temperature sensors for secure seating and absence of corrosion. A loose or corroded connection can lead to incorrect readings. If all other components check out, a faulty control board might be sending erroneous signals.
Common Questions:
Q: What are the primary causes of a WC05 fumes temperature warning?
A: The most common causes are obstructions in the exhaust flue or a malfunctioning exhaust fan, a faulty fumes temperature sensor providing incorrect readings, or, in gas models, issues with the combustion system such as an improper gas-to-air mixture.
Q: Is it safe to continue using the oven with a WC05 error?
A: No, it is generally not safe to continue operating the oven with a WC05 error. High fume temperatures can indicate a fire hazard, carbon monoxide risk (in gas models), or lead to severe damage to internal components. The oven should be immediately shut down until the issue is resolved by a qualified technician.
Q: How can I prevent a WC05 error from recurring?
A: Regular preventive maintenance is key. Ensure routine cleaning of the exhaust flue and filters, inspect the exhaust fan for proper operation, and schedule periodic checks of the combustion system (for gas units) and temperature sensors by a certified technician. Proper installation with adequate ventilation also plays a crucial role.
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.