Water Heater Not Working? Troubleshooting Guide for Utah Homeowners

Losing hot water is one of the most common calls we get, especially first thing on a cold Utah morning. The good news: a fair number of water heater problems have a simple cause you can check yourself before paying for a visit. Here’s how a licensed master plumber works through a water heater that won’t make hot water — and how to know when it’s a quick fix versus a sign the unit is done.

If your water heater is still making hot water but showing warning signs like rust-colored water or popping noises, read the signs your water heater is failing first — that’s a different situation than a unit that’s stopped entirely.

Start With the Power or Gas Supply

Before anything else, confirm the heater is actually getting energy.

Electric water heaters run on a dedicated 240-volt circuit. Open your breaker panel and look for a tripped breaker on the water heater circuit. Flip it fully off, then back on. A breaker that trips again immediately points to an electrical fault — stop there and call a plumber or electrician.

Gas water heaters need both gas supply and a lit pilot (or working igniter on newer models). Make sure the gas valve on the line is open, then check whether the pilot is lit through the small window near the bottom of the tank.

This single step resolves a surprising number of “no hot water” calls. The U.S. Department of Energy has a useful overview of how both types operate at energy.gov’s water heating guide.

Electric Units: Check the Reset Button and Elements

If the breaker is fine but you still have no hot water, the most likely culprits on an electric unit are the high-limit reset switch and the heating elements.

The reset button is a red button on the upper thermostat, behind the access panel. If it has tripped, pressing it may restore heat — but a reset that trips repeatedly means an element is shorting or the thermostat has failed. Electric heaters have two elements; when the lower one fails you get a small amount of hot water that runs out fast, and when the upper one fails you get no hot water at all.

Element and thermostat replacement is a standard repair. If your unit is newer and otherwise sound, it’s well worth doing rather than replacing the whole heater.

Gas Units: Pilot Light and Thermocouple

On a gas water heater, no hot water usually traces back to the pilot system.

If the pilot won’t light at all, or lights but goes out the moment you release the control knob, the thermocouple is the usual suspect — it’s a safety sensor that shuts off gas when it doesn’t detect a flame. A dirty or failed thermocouple is an inexpensive, common repair.

If you smell gas at any point, stop. Leave the house and call Dominion Energy’s emergency line and a plumber from outside. Don’t relight anything until the smell is gone.

Lukewarm or Not Enough Hot Water

Sometimes the heater works but the hot water runs out fast or never gets fully hot. Common causes:

• A failing heating element or thermostat (electric)
• Sediment buildup insulating the burner from the water — very common in Utah
• A thermostat set too low (check it’s at around 120°F)
• A cracked dip tube mixing cold water into the hot outlet
• An undersized unit for your household’s demand

That last one is worth a separate look. If your family has simply outgrown the tank, no repair will fix it — see our guide on what size water heater you actually need.

Why Utah Is Hard on Water Heaters

Utah has some of the hardest water in the country. Those dissolved minerals settle to the bottom of the tank as sediment, where they insulate the burner, force the unit to run longer, and accelerate corrosion. That’s why heaters here often fail earlier than the rated lifespan.

Two things slow it down: flushing the tank once a year, and installing a whole-home water softener. For more on what hard water does to your plumbing, see our Utah hard water guide.

When to Stop and Call a Plumber

Call a licensed plumber right away if you see any of these:

• Water pooling around the base of the tank — the tank has failed; this is replacement, not repair
• A breaker or reset button that trips repeatedly
• A gas smell, or a pilot that won’t stay lit after a thermocouple check
• Rusty or discolored hot water, or popping and rumbling from the tank
• The unit is over 10 years old and acting up

A failed tank can dump 40–50 gallons of water onto your floor, so don’t wait it out. If yours is already leaking, shut off the cold supply valve on top of the heater and read what to do when a pipe bursts for damage control while help is on the way.

We service and replace both tank and tankless water heaters across Utah County, Salt Lake County, and the Park City area. If you’re weighing a replacement, our breakdown of tankless vs. tank water heaters and water heater replacement cost in Utah will help you decide before you call.

Out of hot water and not sure what’s wrong? Call H&M Plumbing at (801) 787-6905 — we’ll diagnose it fast and tell you honestly whether it’s a repair or a replacement.