A washer that isn't getting hot water usually has a closed valve, swapped hoses or a clogged inlet screen on the hot side. Sometimes nothing is wrong at all, because newer washers blend water differently from older ones.
In this post:
- •The hot valve is closed
- •The hoses are swapped
- •The hot-side inlet screen is clogged
- •The washer is mixing water by design
- •The pipe run is long
- •The water heater is the problem
- •The inlet valve or temperature sensor failed
1. The hot valve is closed
The hot and cold supply valves behind the washer work independently, and it's easy to open one and forget the other.
How to tell: The cold valve handle is open and the hot one is turned partway or fully closed, often after plumbing work or a move.
What to do: Open it fully, then run a warm cycle and feel the hot hose a minute into the fill.
2. The hoses are swapped
If the hot supply is connected to the cold inlet, the washer gets hot water only when it asks for cold.
How to tell: The washer's inlets are marked H and C. Check that the hose from the hot valve goes to H.
What to do: Turn off both valves, unplug the washer, then swap the hoses and check for leaks once the water is back on.
3. The hot-side inlet screen is clogged
Each inlet has a small screen that catches grit and mineral flakes, and the hot side tends to scale faster.
How to tell: Hot water trickles in while cold fills normally.
What to do: With the valves off and the washer unplugged, remove the hot hose and gently clean the screen with a small brush. In hard-water areas this is worth checking yearly; see the signs of hard water appliance damage.
4. The washer is mixing water by design
Many newer washers blend hot and cold to reach a set temperature, and some cycles use less hot water than older machines did.
How to tell: Warm feels lukewarm, but the washer runs without errors.
What to do: Check your manual for what each setting delivers. Some models have an internal heater on sanitize or allergen cycles.
5. The pipe run is long
The first water out of a long hot line is cold, and a washer may fill before it warms.
How to tell: The laundry sink tap takes a long time to run hot.
What to do: Run a nearby hot tap until it's warm, then start the wash.
6. The water heater is the problem
If the whole house is short on hot water, the washer is just the first place you noticed.
How to tell: Showers and faucets are lukewarm too, or hot water runs out quickly.
What to do: Check the water heater's temperature setting. Gas water heater problems, including pilot and burner issues, go to a plumber or other qualified professional.
7. The inlet valve or temperature sensor failed
The hot side of the inlet valve can fail on its own, and some washers use a sensor to control fill temperature.
How to tell: No hot water at all, even with the valve open and screens clear. Some models show an error code; codes vary by model.
What to do: Book a technician to test the valve and sensor.
When a technician is the better call
If hot water won't come in after you've checked valves, hoses and screens, our washer repair technicians can test the valve and controls. Water leaking from the valve area also needs attention right away.
Marco's advice: Feel both hoses a minute into a warm fill. If the hot hose stays cold, the problem is upstream of the washer, at the valve, the pipes or the water heater. If it's hot but the tub water isn't, look at the washer.
Still washing in cold? Call ProFix LA at (818) 334-4526.