🔍
American Standard Heat Pump ⛔ Do Not Use

American Standard Heat Pump Error Code 174

American Standard Heat Pump error code 174: Low pressure 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 — 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 Heat Pump 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

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 Contact a licensed HVAC technician — refrigerant handling requires EPA 608 certification
  3. 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 Heat Pump error code 174 mean? ▼
Error code 174 on a American Standard heat pump 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 Heat Pump 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.

More American Standard Heat Pump Error Codes

All American Standard heat pump codes → All American Standard HVAC codes →

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