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Furnace Blinking 3 Times (3 Flashes)

Three flashes on a furnace LED usually indicates a pressure switch or limit fault — but the exact meaning depends on your brand. Select your manufacturer below for the precise code definition and fix.

Reviewed July 2026

What does furnace blinking 3 times (3 flashes) mean?

Three-flash codes are among the most searched furnace diagnostics. On Carrier and Bryant, code 13 often appears as three flashes. On Goodman and Amana, three flashes may mean pressure switch. Always verify against your specific brand before replacing parts.

What usually causes furnace blinking 3 times (3 flashes)?

Pressure switch not closingmost common

Typical repair: $175–$550

Blocked vent or condensate draincommon

Typical repair: $175–$550

High-limit switch tripcommon

Typical repair: $150–$600

Find your exact error code

Select your furnace brand to jump to the code page for this symptom.

Goodman3 FlashPressure-switch circuit did not closeTempstar3 FlashPressure-switch circuit did not closeHeil3 FlashPressure-switch circuit did not closeLuxaire3 BlinksPressure-switch circuit did not closeYork3 BlinksPressure-switch circuit did not closeComfortmaker3 FlashPressure-switch circuit did not closeKeeprite3 FlashPressure-switch circuit did not close

What should I check first when furnace blinking 3 times (3 flashes)?

  1. Count flashes again to confirm exactly three.
  2. Pick your brand below — three flashes mean different things on different units.
  3. Check the condensate drain and vent pipe for blockages.
  4. Replace the air filter before calling a technician.

What a repair costs

A pressure switch replacement typically costs between $175 and $550 nationally.

Typical repair cost
$175 – $550pressure switch replacement
Where the money goes
Part $30–$120Labor $55–$520Typical labor time: 1–2 hrs

This is general information, not professional advice. Gas, electrical, and combustion repairs can be dangerous — when in doubt, call a licensed technician.