Girard GSWH-2 error code Fd
Winter Use Device (WUD) engaged — bimetallic thermostat on the hot water line turned ON at 38°F (3°C), causing the water heater to heat until the thermostat opens again at 58°F (14°C). This is normal freeze-protection behavior.
What to check, and in what order, is in the app. The flow Girard GSWH-2 / GSWH-1 / GSWH-2S — error code / symptom diagnostic walks this code step by step with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.
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- Girard GSWH-2 Owner's Manual
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