High
Repeated ignition failure on Navien NCB H

Your boiler is struggling to light its internal flame, which means it has automatically shut down to prevent gas from building up.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description

Flame error, Flame loss and noise occurs at ignition, or Improper air intake air supply.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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