Safe visible checks
- Thermostat display and settings
- Filter condition and return-air path
- Visible outdoor-unit obstruction
- Photos of the code, unit, and nameplate
Product troubleshooting
Trane 5TWX5018A1 troubleshooting and error codes
Use this table to identify what the visible code may mean and what information to share when scheduling service. Keep checks simple and visible; do not open electrical, refrigerant, gas, or sealed equipment compartments.
Error-code table
Search codes for 5TWX5018A1
| Code | Meaning | System area | Safe first step | Action |
|---|---|---|---|---|
| 1 Flash | Ambient temperature sensor out of range | Outdoor ambient sensor | Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. | View details |
| 2 Flashes | Coil temperature sensor out of range | Outdoor coil sensor | Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. | View details |
| 3 Flashes | Low pressure switch is open | Pressure safety circuit | Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. | View details |
| 4 Flashes | Hard lockout | Defrost control lockout | Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. | View details |
| 5 Flashes | Soft lockout | Defrost control lockout | Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. | View details |
| 6 Flashes | Defrost cycles too close together | Defrost operation | Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. | View details |
| 7 Flashes | Low ambient soft lockout | Low ambient operation | Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. | View details |
No matching error codes found.
Safety note
What is safe to check before service
These pages are meant to help document the issue, not replace diagnosis. GreenFlow should handle pressure-switch, electrical, refrigerant, lockout, recurring, and warranty-related conditions.
Stop and call
- Repeated lockouts or recurring faults
- Pressure-switch or sensor faults
- Electrical odor, unusual noise, or ice buildup
- Any sealed cabinet, refrigerant, gas, or warranty issue
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
Sharad W.
Green Flow and the people who work there are terrific. Vlad and Andre are excellent. Andre was very helpful. He was punctual, respectful, efficient and knowledgeable. He did not try to sell me something I didn’t need ( as others have done before). I was charged $99 which...
Randy J.
Thanks to Andrey for an amazingly quick response to my request for a service call. He diagnosed and fixed my issue within 24 hours of my asking for help. Excellent service. Thanks.
Jack B.
Andrey always does a great job.
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.