This may indicate several conditions including a very leaky waveguide or a potential leak in the dehydrator unit itself. After confirming that the waveguide is “tight”, the next step would be to look for leaks in the dehydrator. Possible areas may include the air filter bowl or drain, a stuck check valve, or loose fittings. In these instances, TSI can provide phone support. If the leak or malfunction is not readily determined, you can return the system for evaluation.