The answer to 'drain trap frozen' is that a frozen drain trap is a common issue that can occur during cold weather. The drain trap is the U-shaped pipe under a sink or floor drain that holds water to prevent sewer gases from entering the home. When this water freezes, it can cause a blockage and prevent water from draining properly.
Common causes of a frozen drain trap include drafts, low insulation, or the trap being located in an unheated area. Symptoms include slow draining, gurgling sounds, and water backing up in the sink or tub. To fix a frozen drain trap, you can try pouring hot water down the drain, using a hair dryer to thaw the pipe, or insulating the trap. However, if the trap is severely frozen or the issue keeps recurring, it's best to call a professional plumber to inspect the problem and make any necessary repairs.