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Trane PTHD090 Limit Switch
A normal limit switch is a switch in the heating area that senses, or governs, if and when the air is actually warm enough for the air to begin normal home circulation. Limit switches exist because if the warmed air is too cool then you will never get hot air through the ducts.
Clues to watch for to know critical limit switch is on its last leg
- Your Trane system will not initiate nor will it stay running for any length of time
- The system starts to runs spotty from time to time
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If you are going to be buying or ordering a new Trane PTHD090 replacement part do your best and cross-check the correct model as well as make a visual inspection so that you are positive that the correct replacement limit switch is the one being purchased. The installing of a new limit switch is a piece of cake if you possess the knowledge and have the tools to get it done.
Feel free to download your manual for help.
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