Trane and American Standard are the same equipment
Trane Technologies makes both brands, and the units are close to identical inside. Parts, wiring and most troubleshooting carry over. If you have an American Standard system, read this page as if it says your brand.
The most common Trane AC problems
- Outdoor fan not spinning, unit humming. Weak run capacitor or a seized fan motor. Very common after a run of hot days in Santa Clarita, Valencia and Canyon Country.
- No cooling at all. Tripped breaker, a burned contactor, a blown fuse on the indoor board, or the drain safety switch shutting the system down.
- Weak cooling, long run times. Dirty filter, dirty outdoor coil, a refrigerant leak, or a compressor that is wearing out.
- Outdoor coil leaks. Many Trane outdoor units use an all aluminum coil Trane calls Spine Fin. It sheds heat well, but when it develops a leak, the coil usually gets replaced rather than patched.
- Communicating system errors. Higher end Trane systems (XV and some XL models with ComfortLink II) show alerts on the thermostat. Note the alert before you power cycle anything.
Safe checks before you call
- Thermostat on Cool and set a few degrees below room temperature.
- New air filter. A choked filter freezes the coil and makes the AC run without cooling.
- AC breaker in the panel and the disconnect at the outdoor unit.
- Clear plants and debris from around the outdoor unit. With power off, rinse the coil gently with a hose. No pressure washer, the fins bend easily.
- Ice on the lines? Set the system to Off and the fan to On until it melts, then call.
Do not open electrical panels inside the unit. Capacitors can shock you even after the breaker is off.
How old is my Trane? Reading the serial number
On Trane and American Standard units built since 2010, the serial number on the data plate starts with the year and the week. A serial that starts with 1834 was built in week 34 of 2018. Older units use a letter based code, and we can read it for you on site.
Refrigerant on Trane systems
Older Trane units use R-22, which is no longer produced. Most units from about 2010 to 2024 use R-410A. New Trane residential systems use R-454B. A system that is low on refrigerant has a leak. We find and repair the leak first, then charge the system by weight and confirm it with pressure and temperature readings.
Repair or replace a Trane AC?
Trane units are built to last, so repair is often the right call on a system under about 12 years old. If the compressor fails on an older system, or the outdoor coil leaks on an R-22 unit, replacement is usually the better money. We show both numbers in writing before any work starts.
