Found condensate pump trying to pump, but not moving any water. Replaced pump, and the issue was not resolved. Traced drain line under the house to find that it is routed to drain outside the foundation by the ac unit. The hose where it penetrates the foundation is frozen. Thawed hose and verified pump operation. Spoke with customer about options for long-term solution. He will contact a plumbing company to install a floor drain at the furnace. The furnace is currently draining into a bucket, and the humidifier is off at the thermostat.