Customer reply replied 5 years ago. This video will show you where you should start with your furnace troubleshooting. Uncategorized ecobee 4 not blowing cold air. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. }, "item": This happened last night and this morning. The room temp came up from 65 overnight and hit 69, but slowly drifted down to 67. Notice that one side is for conventional systems and one is for heat pumps. Thanks in advance! Press question mark to learn the rest of the keyboard shortcuts, https://www.trane.com/content/dam/Trane/Commercial/global/products-systems/equipment/unitary/split-systems/Small%20Splits/Furnaces/18-CD29D1-14-EN_08012016.pdf. Installation These issues are the most common ones that arise and result in your heating systems inability to warm the air and you receiving the cold blast from your air vents instead of the heated air you want. 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