Yes, it happens fairly often. The solution is to flush the system with a 50/50 solution of White Vinegar and Bottled Distilled Water. And clear the outlet line, running from the bottom of unit. Also check any opening to the tank that would allow dust and lint to enter the tank and seal them, if necessary with duct tape. If the furnace is in a dusty area, do the best that you can to eliminate the dust.
Answers & Comments
Yes, it happens fairly often. The solution is to flush the system with a 50/50 solution of White Vinegar and Bottled Distilled Water. And clear the outlet line, running from the bottom of unit.
Also check any opening to the tank that would allow dust and lint to enter the tank and seal them, if necessary with duct tape. If the furnace is in a dusty area, do the best that you can to eliminate the dust.
Hope this helps you to solve the problem.