If checking these basic factors does not resolve the issue, it is recommended to contact a professional HVAC technician. https://images.google.gl/url?q=https%3A%2F%2Fsada--color-maki3-net.translate.goog%2Fbbs%2Fbbs.cgi%3Fpage%3D0%26pid%3D27%26con%3D099%26_x_tr_sch%3Dhttp%26_x_tr_sl%3Dauto%26_x_tr_tl%3Den%26_x_tr_hl%3Dvi