Sauerzbr, please call us at 315-299-3589 to discuss this in more detail and see if we can figure out what is going on. It's easiest to diagnose and fix these issues over the phone.
If you want to do some tests before you call, there are a few possibilities that come to mind:
- The unit is running fine. The speed of the convection fans will lag behind the feed rate. And as long as the feed rate indicates higher than 8 or so, the fans will run (feedrate can be read on the SETUP menu of the thermostat at the end of the menu, item FR). The speed of the motors will change very slowly so it can be difficult to realize it they're running slower than full speed. Try unplugging one of them from the coaltrol and plugging it into a wall socket to see if you hear a difference in the speed of the motor or feel a difference in the air flow from the heat vents.
- Defective power board. Unlikely, but possible. Usually if there is a problem with this one or more of the plug outputs will not power up at all when it is supposed to. To test, run the TEST mode. Hold the menu button in for 5 or so seconds, until the word FEED appears. Press the menu button once more, quickly this time, so it reads TEST. Press the down button to enter the test mode. While in this mode each of plugs will have power cycled on and then off, one output every few seconds. Check to see that the blowers come on and then turn off when they are supposed to (the thermo display will show which output it is currently powering up).
- The speed control circuit is getting "held open". This is rare with the motors that ship from the factory, but it is a possibility. This can happen when the motors plugged into the convection fan output are different enough from each other electronically speaking. To test for this first run the test mode as described above. If the blowers will not shut off once they are turned on, then try unplugging them both from the convection plug(s). Plug only one of them back in and see if it behaves correctly (turns on for a few seconds while the convection output is cycled on and then off). If so, switch blowers and see if the other one behaves too. Next plug both back in again. If they both turn on at the appropriate time, but they don't turn off, then this is the problem.