Error codes › Water Heater — Tankless › Truma AquaGo › W27

Truma AquaGo error code W27

WarningWater Heater — TanklessVerified against the manufacturer's manual

Water circulation pump is running dry (flash S,S,S,L,L,S,L,L) - the circulation pump is not generating water flow; the AquaGo may not have enough water.

What to check, and in what order, is in the app. A step-by-step flow walks this code with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.

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