American Standard
-
⛔ Do Not Use
American Standard - Error Code 173
American Standard Furnace error code 173: Rollout switch lockout.
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 Furnace 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
- ⚠️ Error code flashing on furnace board
- ⚠️ No heat
- ⚠️ Furnace cycling on and off
What the Technician Will Do
🔧 Professional repair required. Do not attempt DIY — this repair requires specialized tools or certification.
- 1 Check your owner's manual for model-specific guidance on error code reset procedures
- 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 Furnace error code 173 mean? ▼
Error code 173 on a American Standard gas furnace 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 Furnace 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.