Error Code
high
Unox STATIC OVEN – Error WS01: Power Board Overheating Warning
On your CHEFTOP and BAKERTOP MIND.Maps™ unit, error code WS01 indicates an…
Unox STATIC OVEN - Error AS01-AS02: Floor or Ceiling Safety Thermostat Alarm
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 UNOX CHEFTOP and BAKERTOP MIND.Maps™ unit, error code AS01-AS02 indicates that a safety thermostat, located on either the floor or ceiling of the cooking chamber, has tripped due to an overtemperature condition. This is a critical safety measure designed to prevent damage and hazards. You must identify and address the cause of overheating or replace the faulty thermostat to restore operation.
Technical Details
Repair Steps:
- Isolate Power and Inspect: Immediately disconnect the oven from its power supply. Allow the unit to cool down completely. Carefully open the outer panels to gain access to the cooking chamber’s floor and ceiling areas where safety thermostats are typically mounted. Look for any visible signs of overheating, such as discolored components, melted plastic, or burnt wiring around the thermostat area.
- Check for Obstructions and Cleanliness: Inspect the area around the safety thermostats for any debris, food particles, grease buildup, or obstructions that might be impeding airflow or causing localized hot spots. Ensure that the internal circulation fans (e.g., DRY.Maxi, ADAPTIVE.Clima) are free of obstruction and can spin freely. Clean any accumulated grime thoroughly.
- Verify Thermostat State and Reset: Locate the safety thermostats. Some models feature a manual reset button (often red or black) on the thermostat itself. If present, press this button firmly to attempt a reset. If there’s no reset button, the thermostat might be an auto-reset type that requires significant cooling or a ‘one-shot’ fuse that requires replacement once tripped. Use a multimeter to check for continuity across the thermostat’s terminals; an open circuit indicates a tripped or failed thermostat.
- Inspect Wiring and Connections: Carefully examine the wiring connecting the safety thermostats to the main control board. Look for any signs of damage, fraying, loose connections, or corrosion. Secure any loose wires and repair or replace any damaged sections.
- Assess Oven Ventilation and Airflow: Ensure that the oven’s external ventilation system is clear and unobstructed. Check if the internal circulation fans (e.g., ADAPTIVE.Clima fans) are operating correctly and consistently, as restricted airflow can lead to uneven heating and trigger safety thermostats.
- Identify Overheating Cause: If the safety thermostat continues to trip, it suggests an actual overtemperature condition. Investigate potential causes of true overheating, such as a faulty main temperature sensor (thermocouple/RTD), a sticking heating element relay (SSR), or a malfunction in the primary control system that regulates temperature.
- Replace Faulty Component: If a specific safety thermostat is confirmed to be faulty (e.g., it remains open circuit even after cooling and attempted reset, or its internal resistance is out of spec), it must be replaced with an OEM-specified part. Ensure the replacement matches the original’s temperature rating and physical form factor.
- Clear Error and Test: After all checks and any necessary replacements or repairs are completed, reassemble the oven panels. Restore power to the unit. Follow the UNOX procedure to clear the error code (this may involve a specific button sequence or a power cycle). Run a diagnostic cycle or a short cooking program to confirm the error does not reappear and the oven operates within normal temperature parameters.
Common Questions:
Q: What does the AS01-AS02 error on my UNOX oven signify?
A: This error indicates that a critical safety thermostat, located either on the floor or ceiling of the cooking chamber, has activated due to an overtemperature event, triggering a safety shutdown.
Q: Can I reset the AS01-AS02 error myself without a technician?
A: Some safety thermostats have a manual reset button, which you might be able to press after the oven has cooled down and the underlying issue (e.g., obstruction) has been resolved. However, if the cause isn’t clear or the thermostat lacks a visible reset, professional diagnosis is recommended.
Q: Is it safe to continue operating my UNOX oven with the AS01-AS02 alarm active?
A: No, it is not safe to operate the oven with this error. The AS01-AS02 alarm is a critical safety measure, and the oven will typically cease operation to prevent potential damage or fire hazards from overheating. Do not attempt to bypass this safety feature.
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.