Zojirushi Keep-Warm Temperature Too Low

Keep-warm mode does not keep food hot enough; food is lukewarm or cool.

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Weak heater output in low-power mode, Faulty temperature sensor reading low, Control board not energizing heater in warm mode, Excessive heat loss through lid gasket

How to Fix / Troubleshooting

Safety first: Check food temperature before consumption; discard if in unsafe temperature range for long periods.

Check lid seal: Ensure the lid gasket is intact and the lid closes fully to retain heat.
Avoid frequent opening: Each lid opening releases heat; minimize opening during keep-warm.
Test with water: Run keep-warm with water and check if it stays noticeably warm after an hour.

When to call a technician: If keep-warm is consistently too cool, internal control or sensor issues are likely.

Repair Difficulty

Medium 3/5

Required Part

Bottom Thermistor, Main Heater Element, Main Control PCB

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