Can you let me know which thermostat needs replacement? The blower works but only cool air is coming out, (no heat).
Answer Hello Leo,
The most likely part responsible is the thermal limiter 134120900. This part can be easily tested by raising the main top with a putty knife or paint scraper and use a test meter set to the lowest resistance setting. Remove the power from the unit before raising the main top and remove one wire from the part located on the heater housing near the rear and test for the same resistance as read when the meter leads are touched directly together, (zero resistance). If it reads opened, replace the part and check the exhaust duct for crimps or clogs to prevent blowing the new part.