HIGH URGENCY

Heil 5 Flashes - Flame Sensed With Gas Valve Off

5 flashes

Flame detected when gas valve should be off - leaky valve.

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

What This Code Means

5 flashes on Heil/Tempstar/Comfortmaker means the flame sensor detects flame even when the gas valve is supposed to be off. Usually a leaky gas valve.

Likely Causes (Ranked)

Most common

Leaky gas valve

What: Valve doesn't fully close.

How to check: Tech valve test.

Fix: Replace gas valve.

Shop parts

Less common

Faulty control board

What: Board misreads flame signal.

How to check: Tech diagnostic.

Fix: Replace board.

Shop parts

Diagnostic Steps

Shut off gas immediately
Cut power
Call licensed HVAC tech

Frequently Asked Questions

Is Heil 5 flashes dangerous?

Yes - uncontrolled flame. Shut off gas immediately.

Same on Tempstar/Comfortmaker?

Yes - identical code system across ICP family.

DIY?

No - gas valve work is professional only.

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Related Symptoms

Need More Help?

Try our interactive symptom diagnostic tool or browse Heil parts.

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