Often when the unit stops feeding pellets, customers assume there is an issue with their auger. In reality, this issue is often the result of a vacuum pressure problem. If the vacuum switch is operating correctly, there will be a “V” symbol visible on the bottom of the main screen on the control panel when the exhaust fan is running.
To test the vacuum/pressure switch, disconnect the air hose from the body of the stove. With the other end still attached to the air switch, very gently create suction on the loose end of the hose (You may want to remove the hose entirely from the port on the stove and the air switch first to make sure it is clear). If you hear a click, the air switch is working (Be careful during this step. Creating too much negative pressure can damage the switch).
If the switch appears to be operating correctly but you are still receiving a vacuum-related error code make sure to check:
1.) All gaskets are in good condition.
2.) The main load door and ash door are closing correctly.
3.) There are no obstructions in the exhaust vent or combustion blower.