Armstrong Air Rollout or Auxiliary Limit Trip

Furnace starts normally but shuts down after 30–60 seconds with no obvious error code; blower may or may not start.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Blocked heat exchanger or secondary heat exchanger, Blocked vent or intake, Flame rollout, Failed rollout switch

How to Fix / Troubleshooting

Safety: Rollout and auxiliary limits protect against fire and CO hazards. Do not bypass them.

Steps to check (visual only):

  • Inspect around burners: Look for signs of scorching or melted components near the rollout switches.
  • Check vent and intake: Ensure exterior terminations are clear of debris, snow, or ice.
  • Reset manual rollout (if present): Some Armstrong Air models have manual-reset rollout switches. Only reset once after confirming there is no visible blockage. If it trips again, call a technician.

Technician tasks:

  • Inspect and clean heat exchangers.
  • Verify proper draft and combustion.
  • Replace faulty rollout or limit switches.
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Repair Difficulty

Professional Required 5/5

Required Part

Flame Rollout Switch
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