Suburban IW60 / Nautilus error code E5
Thermal switch fault - HI limit (Auto Reset or Manual Reset) open (LOCKED)
What to check, and in what order, is in the app. The flow Suburban tankless — IW60 / ST-42 / ST-60 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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- Suburban_Nautilus_IW60_Service_Training_Manual.txt
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