Trane model YCC024F1L0BC Mfg 05/96 "Forced Air Furnace with Cooling".... a.k.a "Packaged Gas Electric Unit"... Board inside unit has printed info = C662900G01 and CNT 1634 and Model 1068-100. Noted a red LED light blinking, once per second. No place to read out any error codes.
Unit sat unused for several months while house was empty. Cooled OK this summer. Now cycling Heat to Off (wait 10 sec) then to Heat to get heat to restart after temp falls below setting. Replaced theromostat, no change. Would like to fix myself or know how much I am looking at paying, i.e. will some major component
have to be replaced? Not loaded with cash since we just bought the house. No warranty from previous homeowner. HELP!?