Merrychef e2s - E104: OVERHEAT STATS RELEASED - Cavity Overheat Thermostat / Magnetron Overheat Thermostat(s) / Convection Fan Internal Protection (IP)

🛑 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 eikon® e2s unit, error E104: OVERHEAT STATS RELEASED indicates an open safety thermostat circuit, preventing operation. This often results from blocked cooling, such as a dirty front filter, or a manually tripped cavity overheat thermostat. Begin by power cycling, then inspect cooling fins and filters, and be prepared to manually reset the cavity overheat thermostat.

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Technical Details

Repair Steps:

  1. Initial Power Cycle: Switch the oven OFF, then back ON. If the E104 error returns immediately before pre-heat, the safety circuit remains open.
  2. Extended Power Cycle: If the error persists, switch the oven OFF and disconnect it from the mains power supply for at least 20 minutes. Reconnect and switch the oven back ON.
  3. Cavity Overheat Thermostat Reset: If the E104 fault still shows, the issue is likely the cavity overheat thermostat. This requires a manual reset. Locate the 5.5mm cover bolt on the back panel (next to the rear vent), remove it, and depress the reset button beneath.
  4. Check for Overheating Causes (If fault clears initially but recurs): If the fault clears after a power cycle but returns later, the problem is likely overheating of the magnetron(s) or convection fan motor.
  5. Inspect Cooling Components:
    • Check that the front filter is clean and free from dust, debris, and grease. Clean as required.
    • Examine the magnetron cooling fins (heat sink) for any build-up; clean thoroughly if necessary.
    • Ensure all oven panels are fitted correctly and there are no cooling air leakages around the panel work. Proper airflow is critical.
    • Verify sufficient cooling from the air curtain at the front of the unit.
  6. Electrical Circuit Verification:
    • Check all safety trip circuit wiring and connections for integrity and secure fit.
    • Check the continuity of each overheat switch individually to confirm proper function.
  7. Review Error Log: Access the error log to check the board temperatures at the time of failure. This can help determine the cabinet air temperature when the fault occurred.
  8. Understand Magnetron/Fan Resets: The magnetron overheat thermostat(s) and convection fan motor’s internal protection are designed to automatically reset once they have cooled down sufficiently. The cavity overheat thermostat is manual.
  9. Preventative Measures for Cavity Overheat: The cavity overheat thermostat typically trips if the mains power is disconnected at the end of service without allowing the cavity to sufficiently cool down first. Ensure the oven has cooled down before powering off completely.
  10. Note on E115/E117: If the magnetron was active when any overheat thermostat opened (tripped), an E115 error (E117 on older firmware) would be generated instead of E104. E104 specifically indicates an open circuit when the magnetron is not active.
  11. Critical Warning: Never test the oven with panels removed. The panels are essential for guiding cooling air effectively through the cooling fins via forced airflow. Operating without them will cause rapid overheating and damage.

Common Questions:

Q: What are the primary causes of an E104 OVERHEAT STATS RELEASED error on my Merrychef eikon® e2s?

A: This error is commonly triggered by insufficient cooling, often due to a dirty front filter, obstructed magnetron cooling fins, or improper panel installation blocking airflow. It can also occur if the cavity overheat thermostat trips when the oven is powered off before cooling down.

Q: How do I manually reset the cavity overheat thermostat if it’s causing the E104 error?

A: To manually reset, first ensure the oven is cool and disconnected from power. Locate the 5.5mm cover bolt on the oven’s back panel, near the rear vent. Remove this bolt and then depress the reset button found underneath it.

Q: Why might I get an E104 error at the start of the day after the oven was fine the previous evening?

A: The cavity overheat thermostat can trip if the oven’s mains power was disconnected at the end of service without allowing the oven cavity to cool down sufficiently. The E104 error then appears when the oven is switched on the following day.

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.

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