What the code means
EC 57: Refrigerant pipe temperature sensor error
The Carrier 38MURA error display indicates a refrigerant pipe temperature sensor error.
Troubleshooting code
Carrier Crossover 47000 BTU Up to 15.6 SEER2 High Heat Capable Heat Pump Condensing Unit R-410A (208/230-1) EC 57 troubleshooting
Refrigerant pipe temperature sensor error. Use this page to document the issue and prepare for service. GreenFlow should handle diagnosis for electrical, refrigerant, lockout, or recurring conditions.
Safe checks before calling
- Confirm the thermostat or controller is powered, set correctly, and calling for heating or cooling.
- Check filters, return-air grilles, supply registers, and visible airflow paths that can be reached without opening equipment panels.
- Look for visible outdoor-unit or rooftop obstructions, debris, snow, ice, or blocked clearances from a safe location only.
- Take photos of the displayed code or LED pattern, equipment nameplate, thermostat or controller, and the surrounding equipment area before scheduling service.
When to stop and call GreenFlow
Call GreenFlow if the code repeats, the unit is locked out, heating or cooling is not restored, there is flame, gas, electrical, refrigerant, pressure, compressor, fan-motor, rooftop-access, or warranty-related concern, or any troubleshooting would require opening equipment panels.
Share the visible code, model and serial number if available, photos, current symptoms, and whether the issue affects heating, cooling, or both.
EC 57 questions
What does EC 57 mean on a Carrier Crossover 47000 BTU Up to 15.6 SEER2 High Heat Capable Heat Pump Condensing Unit R-410A (208/230-1)?
The Carrier 38MURA error display indicates a refrigerant pipe temperature sensor error.
What should I safely check before scheduling service?
Confirm thermostat or controller status, check filters and visible airflow restrictions, look for outdoor-unit or rooftop obstructions from a safe location, and take photos of the code or LED pattern and nameplate. Do not open electrical, gas, refrigerant, or rooftop control compartments.
When should GreenFlow handle this code?
Call GreenFlow if the code repeats, the unit is locked out, heating or cooling is not restored, there is flame, gas, electrical, refrigerant, pressure, compressor, fan-motor, rooftop-access, or warranty-related concern, or any troubleshooting would require opening equipment panels.
Brands We Service
No matching featured brand found.
Popular cities
Service Areas
No matching service area found
Try another nearby city or contact GreenFlow to confirm service availability.
Our Happy Customers
Anna F.
They showed up within an hour of me making the call on a Sunday. They fixed our system and taught us how to replace the fuse in the future. We would definitely call again.
Terry S.
Excellent service from best tech!
Jahangir R.
They were very organized to communicate and be on time to come to look at my air condition to fix it.
Neal V.
In an industry that often fraught with contractors taking advantage of homeowners, Andrey was honest with his assessment and willing to install a product acquired elsewhere (most want that margin themselves), patiently answered my questions (I’m an engineer so like to understand what’s happening), and proactively offered practical...