my wesbasto heater is not working right,, it is the air top 2000,, it is getting hot and blowing air, but is not blowing hard enough, it is not throwing any fault codes, there is no kinked hoses or lines, i can put my hand over the blower and it is very hot but does not seem to be blowing hard, i could always turn the thermostat half way and be roasted out but it is the whole way up and still cold in here