American Standard
-
⛔ Do Not Use
American Standard - Error Code 174
American Standard Central Air Conditioner error code 174: Low pressure switch lockout.
Is it safe?
⛔ No — stop using
Do NOT operate — refrigerant handling requires EPA 608 certification. Continued operation will damage the compressor.
Can I fix it?
Technician Required
Repair cost
Pro: $300–$1,500
⏱ 2–4 hours (pro)
What Does Error Code 174 Mean?
American Standard Central Air Conditioner error code 174: Low pressure switch lockout.
Part that typically fails: Refrigerant circuit / expansion valve
Do NOT operate — refrigerant handling requires EPA 608 certification. Continued operation will damage the compressor.
Symptoms You May Notice
- ⚠️ No cooling
- ⚠️ System short-cycles (shuts off within minutes)
- ⚠️ Ice on refrigerant lines or coil
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 Contact a licensed HVAC technician — refrigerant handling requires EPA 608 certification
- 3 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 174 mean? ▼
Error code 174 on a American Standard central air conditioner indicates: Low pressure 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 174? ▼
Start by powering the unit off for 30 seconds and restarting. If error 174 returns, the underlying cause (low pressure switch lockout) needs to be addressed. Check wiring connections and filters first before replacing components.
Is American Standard error code 174 serious? ▼
It depends on the root cause. Some 174 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.