H02
Zojirushi Low Temperature / Heating Failure Detection

H02 appears and the cooker stops heating or cannot maintain keep-warm temperature.

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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.

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Possible Causes

Failed main heater element, Loose heater wiring, Blown thermal fuse, Faulty control relay on PCB

How to Fix / Troubleshooting

Safety first: Unplug the unit before any inspection. Internal heater circuits carry mains voltage.

  • Confirm symptom: Start a cooking cycle with water and check after 10–15 minutes if the water is warming. If it remains cold, heating has failed.
  • External checks only: Inspect the underside and cord area for burnt smell or discoloration. Do not open the housing.
  • Reset: Unplug for 10 minutes and retry. If H02 returns and there is no heat, internal components have likely failed.

When to call a technician: Heater, thermal fuse, and relay testing require opening the unit and using a multimeter. This should be done by a qualified technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Main Heater Element, Thermal Fuse, Main Control PCB
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