Start with a map of what still works
Before reaching for a hair dryer, spend five minutes running every fixture in the house and writing down the result. Water travels from the main through branch lines, so a frozen section shuts off everything downstream of it and nothing upstream. The pattern of dry and running fixtures tells you roughly where the ice is.
Hot and cold are separate lines. If only the hot side of a sink is dead, the ice is in the hot branch, which often runs a different route from the cold. If both are dead at one sink while the toilet beside it runs, the problem is probably in that sink's wall or cabinet. If an entire bathroom is dry, look at where its lines pass through the coldest part of the house, such as the floor over a garage.
Reading the pattern
- IfNothing in the house runsThenSuspect the main line near where it enters, a meter in a cold spot, or a meter pit outside. Contact your water provider if the meter is in a pit.
- IfA whole bathroom or floor is dryThenLook at the branch feeding it, especially where it passes through a garage ceiling, cantilevered floor or exterior wall.
- IfOne sink is dry on both hot and coldThenFocus on the cabinet and the exterior wall behind it.
- IfOnly one side, hot or cold, is dryThenTrace that line alone; the other side took a warmer route.
- IfOnly an outdoor faucet or the washer is affectedThenCheck the sillcock tube or the laundry wall, which is often on the garage side.
Clues that help pinpoint the ice
| Clue | What it suggests | Caution |
|---|---|---|
| Frost or a cold spot on drywall | Pipe close to the surface in that cavity | Do not cut drywall just to look; ask a plumber |
| Visible frost on exposed pipe | Ice is at or near that section | Check nearby for bulges or splits before thawing |
| A thermal camera or infrared thermometer | Cold stripes along a wall can follow a pipe | Readings show surface temperature only |
| Faucet that trickles instead of stopping | Partial blockage, still forming | Keep it open; act before it closes completely |
| Hissing or crackling in a wall | Water moving past a crack or ice shifting | Close the main and treat it as a possible leak |
Once you think you know where it is
Open the affected faucet
This gives melting water a path and relieves pressure on the pipe.
Warm the room, not just the pipe
Raise the thermostat, open cabinets, and close the garage door so the whole area warms.
Apply gentle heat to exposed pipe
A hair dryer, heating pad or electric space heater at a safe distance. Start nearest the faucet and work back toward the ice.
Keep the main within reach
If thawing reveals a split, the leak starts the moment the ice lets go. Someone should be ready to close the main.
Call a plumber for hidden runs
Lines inside finished walls and ceilings are better thawed by someone who can open a small access point safely.
Common questions
Is it safe to use a heat gun or torch?
Open flames and high-heat guns can start fires inside walls and damage plastic pipe. Stick to gentle heat sources and call a plumber for anything you cannot reach.
Why would only the hot water freeze?
Hot water lines often take a different path and may be the one closest to a cold wall or the one that sits unused overnight. The route is what matters, not the water heater.
General information for Parker, not a quote or professional advice. In an emergency, call 911.