When the furnace blinks in four blinking and pause and three blinks and pause again. If the diagnostic lite is on steady and not flashing, that is indicating a normal steady or intermediate state. Then if the furnace appears code 23 or 33 on the control panel. If the green light is flashing slowly it means the furnace is on but there is no request for heat. Fortunately, this is a relatively easy fix. Check the vent pipe or switch hose. For the last couple of weeks, the furnace has been failing to heat to 66 in the morning. I get 27.7 volts on the transformer. Perhaps, for another standard the blinking red light on furnace is dangerous or bad things but sometimes it is not as well as the American standard furnace. #wsite-title {} I do hope that everything works out with the furnace. The technician will likely tighten other wires for you in the process to prevent … } .wsite-elements.wsite-not-footer:not(.wsite-header-elements) h2, .wsite-elements.wsite-not-footer:not(.wsite-header-elements) .product-long .product-title, .wsite-elements.wsite-not-footer:not(.wsite-header-elements) .product-large .product-title, .wsite-elements.wsite-not-footer:not(.wsite-header-elements) .product-small .product-title, #wsite-content h2, #wsite-content .product-long .product-title, #wsite-content .product-large .product-title, #wsite-content .product-small .product-title, .blog-sidebar h2 {} Your expert will be able to help answer your question. The last thing anyone wants to deal with, when it is bitterly cold outside, is a furnace that stops working. }}\"\n\t\t{{\/membership_required}}\n\t\tclass=\"wsite-menu-item\"\n\t\t>\n\t\t{{{title_html}}}\n\t<\/a>\n\t{{#has_children}}{{> navigation\/flyout\/list}}{{\/has_children}}\n<\/li>\n","navigation\/flyout\/list":"