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WFCO Power Pro error code DSI status is fault

WarningMultiplex Coach ControlVerified against the manufacturer's manual

Proactive voice notification on the panel and push notification on the phone (off by default, enabled under TTS Notification Settings) that the water heater's DSI (direct spark ignition) control is reporting a fault on the WH-DSI input wired to the Smart Power Unit. The WF-3510 panel also carries a dedicated 'DSI Fault Indication' LED (item 11 on its panel drawing). The Power Pro only relays the signal - the ignition fault itself is in the water heater.

What to check, and in what order, is in the app. The flow WFCO Power Pro / Power Mini - panel troubleshooting (Bluetooth, wake word, OTA, zone names, unresponsive, DSI notification) 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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