My englander 25 pdc runs for 30 minutes and then stops feeding pellets. It cools down and starts feeding pellets again a lot of pellets that do not refire. Motors work fine.....in c mode... ..I placed a 1/4 fuel line to vacuum switch to get me through but still does the same thing... waiting on hose from englander...any help would be great...can I bypass vacuum switch to get by until delivery...it's the switch on the right side above the out pipe.