Short cycling — when your Trane furnace turns on, runs for a few minutes, shuts off, and then starts the cycle again — is one of the most common and damaging furnace problems. The furnace never completes a full heating cycle, your home stays cold, and the repeated starts put excessive wear on the heat …
A 4-flash fault code on a Trane furnace means the high limit switch has opened — the furnace detected that the heat exchanger was getting too hot and shut down the burners to prevent damage. This is one of the most important safety features on your furnace, and it is also one of the most …
Trane gas furnaces use a diagnostic LED on the control board to communicate fault codes through a series of blinks. When something goes wrong, the LED flashes a specific pattern — a number of rapid blinks followed by a pause — that points to the cause of the problem. Understanding what these codes mean can …