Armstrong Air
Post-Outage Lockout / Brownout Protection
System will not start after a power outage, even though power has been restored
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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
Control board lockout due to low voltage event, Tripped breaker, Damaged surge protection device, Corrupted board memory
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker and outdoor disconnect before inspecting equipment.
Steps:
- 1. Check breakers and disconnects: Reset any tripped breakers once. Ensure the outdoor disconnect is fully inserted.
- 2. Power cycle system: Turn off power to both indoor and outdoor units for at least 5–10 minutes to allow control boards to fully reset.
- 3. Inspect surge protector (if installed): Some Armstrong Air systems have external surge devices. Check indicator lights and replace if they show failure.
- 4. Restore power and wait: After turning power back on, wait several minutes. Some boards have built-in time delays before restarting.
- 5. If system remains dead or unresponsive: The control board may have been damaged by the outage and require professional replacement.
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Repair Difficulty
Medium
3/5
Required Part
Outdoor Control Board
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