Error Code
high
Unox OVEN – Control Panel or USB Board Defective – Buzzer Does Not Sound
On your CHEFTOP and BAKERTOP MIND.Maps™ unit, a non-sounding buzzer often indicates…
Unox OVEN - Error WF36: Water Supply or Sensor Fault (EL1/EG1/EG2)
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 WF36 indicates a critical lack of water or a fault with the EL1, EG1, or EG2 sensors. This prevents steam generation and cooking operations. Immediate inspection of the water supply, filter, and specific sensors is required to diagnose and resolve the issue.
Technical Details
Repair Steps:
- Check Main Water Supply and Pressure: Ensure the primary water isolation valve for the oven is fully open. Verify that your facility’s water pressure meets UNOX specifications (typically minimum 150kPa / 22psi). Inspect the water inlet hose for any kinks, blockages, or damage that could restrict flow.
- Inspect External Water Filter/Softener: Examine your external water treatment system. A clogged water filter cartridge or an exhausted water softener resin can severely restrict water flow, leading to this error. Replace cartridges or regenerate the softener if overdue.
- Verify Water Inlet Solenoid Valve Operation: Locate the water inlet solenoid valve at the rear of the oven. With power applied (CAUTION: use proper safety measures), check if the valve opens and allows water into the unit. Listen for a click or feel for vibration. Test its continuity and check for any debris blockage at the valve’s inlet screen.
- Examine Level Electrode (EL1): The EL1 electrode monitors the water level inside the steam generator. It can become fouled with scale, leading to inaccurate readings. Power down and disconnect the unit before accessing. Carefully remove the EL1 electrode and thoroughly clean any scale buildup. Check the wiring from EL1 back to the control board for continuity, corrosion, or loose connections.
- Inspect Steam Generator Probes (EG1/EG2): EG1 and EG2 are typically temperature or pressure sensors associated with the steam generator. Consult your unit’s wiring diagram to locate these. Check their wiring connections for security and absence of corrosion. If possible, measure their resistance (for NTC/PTC thermistors) and compare to manufacturer specifications or check for proper signal output (for pressure switches).
- Perform Descaling Cycle: If scale buildup is suspected within the steam generator, a thorough descaling cycle is recommended once the water supply issue is resolved. Heavy scale can interfere with sensor function and water circulation.
- Check Control Board Connections: Trace all wiring from the EL1, EG1, and EG2 sensors back to the main control board. Ensure all connectors are firmly seated and free from any signs of burning or corrosion. A poor connection can mimic a faulty component.
- Contact Certified UNOX Service: If the above steps do not resolve the WF36 error, or if you are uncomfortable performing these technical checks, it is strongly recommended to contact a certified UNOX service technician. There may be an internal wiring fault, a malfunctioning control board, or a more complex component failure requiring specialized diagnostics.
Common Questions:
Q: What does “lack of water” specifically mean for a UNOX oven?
A: For a UNOX CHEFTOP or BAKERTOP MIND.Maps™ oven, “lack of water” indicates that the steam generator cannot be filled or maintained at the correct level, preventing steam production essential for cooking modes and potentially causing damage to heating elements.
Q: Can I fix a faulty EL1, EG1, or EG2 sensor myself?
A: While cleaning a scaled EL1 electrode might be possible for a technically inclined user, diagnosing and replacing EG1 or EG2 sensors typically requires specialized tools, knowledge, and calibration. It is generally recommended to consult a certified UNOX technician for sensor replacements to ensure proper function and safety.
Q: How often should I check my water supply and filter to prevent WF36?
A: Regular preventive maintenance is crucial. Your water filter cartridges should be checked and replaced according to manufacturer recommendations (typically every 3-6 months depending on water hardness and usage). Periodically verify adequate water pressure and inspect supply lines for issues to prevent error WF36.
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.