Granitestone Timer / Clock Calibration Error

Timer counts down too fast or too slow compared to real time.

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 timing crystal on control PCB, Firmware bug, Voltage instability affecting MCU timing, Defective main control PCB

Safety first: Unplug before opening the unit.

Steps to address timing issues:

1. Confirm symptom: Compare a 10-minute cycle with a separate timer. Note any large discrepancy.
2. Power reset: Unplug for 10–15 minutes and retest. Minor glitches may clear.
3. Check power source: Ensure the outlet provides stable voltage and is not shared with heavy appliances.
4. Replace control PCB: Timing is controlled by the microcontroller and its crystal on the main control PCB. If timing remains inaccurate, replace the board.

Medium 3/5

Main Control PCB

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