I am in Boston and my girlfriend is in Texas with a HVAc unit by Comfortmaker (EXM36F19C1) that quit working. She told me that it was working fine after she had done some insulation work in the attic. A few hours later our daughter noticed that the heater was blowing but no heat was coming out. Renee went through the reset procedure that was on the unit and that did not help. She did not see any flashing lights or hear any clicking. Comfortmaker site was NO help!
The only way to shut the blower off is to shut off the breaker in the electric panel.