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Furnaces · 22 codes

Flame sensor

These codes name a flame sensor in the manufacturer document linked on the row. The sentence is the wording published from that document. Codes that do not name it are not listed.

Updated

What the manuals say about cleaning

Goodman GR9S96/GD9S96 installation and operating guide (IOG-2037B) says the flame sensor should be carefully cleaned by a qualified servicer using emery cloth or steel wool. Goodman IOG-2037B (opens in a new tab) ↗

Rheem R96V installation instructions recommend that at the beginning of the heating season the flame sensor be cleaned with fine steel wool or a Scotch Bright Pad by a qualified installer, service agency or the gas supplier. Rheem R96V installation instructions (opens in a new tab) ↗

Codes that name it

American Standard

Lennox

Trane

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Safety first

Unplug the furnace or switch it off at the breaker, and shut off the gas supply where relevant, before you open any panel. Capacitors can hold a charge after power is off. Gas, electrical-panel, refrigerant and carbon-monoxide work belongs to a licensed professional. Follow the manual for your model (safety terms).

Smell gas?If you smell gas, leave the building and call your gas utility from outside.