I have a Williams gravity vented wall furnace, model #: 3509622, serial #: J 094628.
The problem that I am having is that, once I set the thermostat to a specific setting it will turn on, but I can't feel any heat coming from it.
Usually I can feel the heat above the pilot door opener and above, but now I can't feel heat coming out.
Looking at the picture below:
In the RED section, I can feel heat coming from it.
In the YELLOW section, I can't feel the heat at all. It worked fine last year and I've been cleaning it and taking the dust off...