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American Standard Central AC ⛔ Do Not Use

American Standard Central AC Error Code 173

American Standard Central Air Conditioner error code 173: Rollout switch lockout.

Last reviewed: Last updated:

Methodology: We combine OEM HVAC documentation with field repair patterns, then review for safety-first troubleshooting.

Sources: HVAC manufacturer documentation, installation/service manuals, and technician-reported repair patterns.

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

Is it safe?
⛔ No — stop using
Do NOT operate — potential gas or CO hazard. Ventilate the area and call a technician immediately.
Can I fix it?
Technician Required
Repair cost
Pro: $150–$600
⏱ 1–3 hours (pro)

What Does Error Code 173 Mean?

American Standard Central Air Conditioner error code 173: Rollout switch lockout.

Part that typically fails: Gas valve / igniter / heat exchanger

Do NOT operate — potential gas or CO hazard. Ventilate the area and call a technician immediately.

Symptoms You May Notice

What the Technician Will Do

🔧 Professional repair required. Do not attempt DIY — this repair requires specialized tools or certification.
  1. 1 Check your owner's manual for model-specific guidance on error code reset procedures
  2. 2 If the error persists after reset and basic checks, contact a qualified technician
⚡ Quick tip: Always try a full power reset first — turn the unit off at the breaker, wait 30 seconds, restore power.

Frequently Asked Questions

What does American Standard Central Air Conditioner error code 173 mean? ▼
Error code 173 on a American Standard central air conditioner indicates: Rollout switch lockout. The unit has detected this condition and has limited or stopped operation to prevent further damage.
How do I fix American Standard Central Air Conditioner error code 173? ▼
Start by powering the unit off for 30 seconds and restarting. If error 173 returns, the underlying cause (rollout switch lockout) needs to be addressed. Check wiring connections and filters first before replacing components.
Is American Standard error code 173 serious? ▼
It depends on the root cause. Some 173 errors resolve with a reset. Others indicate a failed component that requires professional repair. Don't continue operating with this error — it can lead to further damage.

More American Standard Central AC Error Codes

All American Standard central ac codes → All American Standard HVAC codes →

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