Unknown
E352 on Navien NCB300

Navien NCB300 fault code E352

What the manual says

Manufacturer manual

Unable to detect or measure changes of water pressure

From this model's manual
Verified against the Navien/Navien Ncb300 Combi Service Manual30k 250328 Pdf installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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All 55 fault codes on the NCB300

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