| Symptom | Manual's Suggestion | What It Really Means | | :--- | :--- | :--- | | Timer doesn't count | Check power | Your control signal (e.g., switch on pin 5) is floating. Pull it to neutral/negative. | | Relay chatters | Voltage fluctuation | The power supply is undersized. Use a dedicated power supply for the coil. | | Display flashes "EEEE" | Range exceeded | You set a time longer than the selected range. Increase the DIP switch range. | | Timer resets randomly | Noise interference | Add a snubber (RC filter) across the relay coil. The manual rarely mentions this. | | Wrong timing mode | DIP switch error | The manual's mode table is read in binary, but some models use Gray code. Toggle all switches to zero and reconfigure. |
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