Hitachi Function Selection / Relay Drive Fault

Timer counts down but oven does not heat when a program is started

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

Faulty mode selector (if rotary), Failed heater relays on control PCB, Incorrect wiring after previous repair

Safety first: Disconnect power before opening panels.

Confirm settings: Ensure a heating mode (bake, grill, convection) and temperature are selected, not just the timer.
Listen for relays: When starting a heating mode, you should hear a click from the control board. No click may indicate a failed relay or drive circuit.
Check selector switch: On models with a mechanical selector, test continuity of the switch contacts in each mode.
Replace faulty parts: Replace the mode selector switch or main control PCB if they fail tests.

Medium 3/5

Mode Selector Switch

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