In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Three flashes, then okay again.
My furnace stopped blowing warm air, so I checked it. The flame was out and the "code" was three flashes. I turned off the heat. The HVAC guy I called said that meant the pressure switch. The next day, he came out and said everything was fine - that it wasn't showing the code and it was working fine.
Does that happen? (A code is shown, then resolves itself)? I read that the pressure switch is a safety thing, so I'm worried now.