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MEDIUM URGENCY

Heil 2 Flashes - Pressure Switch Did Not Open

2 flashes

Pressure switch did not open between cycles.

Brand: Heil (Also covers Tempstar, Comfortmaker, Keeprite, ICP, Day & Night, Arcoaire)  |  Equipment: Gas Furnace

What This Code Means

2 LED flashes on a Heil, Tempstar, Comfortmaker, or Keeprite furnace mean the pressure switch failed to open when the inducer motor turned off. Usually stuck switch or obstructed tubing.

Likely Causes (Ranked)

Most common

Stuck-closed pressure switch

What: Switch contacts welded or jammed.

How to check: Test continuity with inducer off.

Fix: Replace switch.

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Common

Blocked exhaust

What: Residual draft from blocked vent keeps switch closed.

How to check: Inspect outdoor exhaust.

Fix: Clear blockage.

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Less common

Bad inducer motor

What: Inducer doesn't fully stop.

How to check: Listen at end of cycle.

Fix: Replace inducer.

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Diagnostic Steps

  1. Cut power
  2. Test pressure switch continuity
  3. Inspect exhaust outlet
  4. Replace switch if stuck
  5. Call tech for inducer issues

Frequently Asked Questions

Same on Tempstar/Comfortmaker?
Yes - all ICP family brands (Heil, Tempstar, Comfortmaker, Keeprite, Day & Night, Arcoaire) share the same control board and codes.
DIY?
Switch replacement yes (\$25-60 part).
Cost to fix?
Switch is cheap; labor varies.

Related Heil Codes

Heil Error Code 3 FlashesHeil Error Code 7 Flashes

Related Symptoms

Furnace Not Igniting

Need More Help?

Try our interactive symptom diagnostic tool or browse Heil parts.

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