HVAC Shop Blog

A Brivis heater that won't ignite is one of the most common call-outs at the start of winter — and most faults come down to five key components. This diagnostic guide walks through the full ignition sequence, then covers pilot burner and ignition assembly faults, thermocouple failure, thermistor errors, pressure switch lockout, and control board faults. Includes a fault symptom reference table and guidance on what homeowners can legally diagnose vs what requires a licensed gas fitter.

When a Brivis ducted gas heater stops working, the fault usually comes down to one specific component. This complete guide covers every major spare part in the Brivis range — ignition assemblies, pressure switches, control boards, thermocouples, gas valves, and transformers — including how to identify the correct part by BS code, why gas type and Pa rating matter, and what to check before you order. Covers Brivis, Braemar, Bonaire, and Buffalo platform compatibility.