This never happens during the day when the furnace is maintaining 66. Here, be sure that there are no obstructions. I read something about codes. It is normal for the furnace, you do not need to spend your money and call the operation system. The most important thing to do is calling the carriers. .wsite-headline,.wsite-header-section .wsite-content-title {} What does it mean?Maybe it is getting the holiday spirit.I wish it was, and happy holidays to you. _W.storeCountry = "US"; Download 8 Day and Night Furnace PDF manuals. ... For example, some models will use a blinking L.E.D. It may take 24-48 hours. .fancybox-title {} _W.configDomain = "www.weebly.com";_W.relinquish && _W.relinquish() No Idea what that means. Oh no, I have a Carrier furnace blinking red light. var STYLE_PREFIX = 'wsite'; I did have the thermostat set on 68. Hello all, I keep my thermostat at 66 during the day and 58 at night. initEvt.initEvent('customerAccountsModelsInitialized', true, false); For the last couple of weeks, the furnace has been failing to heat to 66 in the morning. The yellow light in the sight glass is blinking. When it is flashing fast the furnace is providing heat to the home. //-->. The unit has been stable (no "water flow" warning lights) over the last cold spell - last 3 days. .wsite-elements.wsite-footer div.paragraph, .wsite-elements.wsite-footer p, .wsite-elements.wsite-footer .product-block .product-title, .wsite-elements.wsite-footer .product-description, .wsite-elements.wsite-footer .wsite-form-field label, .wsite-elements.wsite-footer .wsite-form-field label{} My pilot light is on and the thermostat is set below the ambient temp but my furnace will not kick on. Clean a pipe cleaner in four holes. But several cases, the code means the air blowers are not well working or dead. #wsite-content h2, #wsite-content .product-long .product-title, #wsite-content .product-large .product-title, #wsite-content .product-small .product-title, .blog-sidebar h2 {} _W.storeName = null; #wsite-content div.paragraph, #wsite-content p, #wsite-content .product-block .product-title, #wsite-content .product-description, #wsite-content .wsite-form-field label, #wsite-content .wsite-form-field label, .blog-sidebar div.paragraph, .blog-sidebar p, .blog-sidebar .wsite-form-field label, .blog-sidebar .wsite-form-field label {} {"navigation\/item":"