Troubleshooting · Entry 01

No hot water? Let's narrow it down.


A cold shower this morning is a rough start, but most no-hot-water trouble comes down to one small failed part, not a whole dead heater. A few checks tell you which part quit.

What it usually is

  • 01Pilot light out on a gas heater (drafty utility rooms and water-heater closets knock them out more than you'd think).
  • 02Burned-out heating element on an electric heater — usually the lower one goes first.
  • 03Bad thermostat that's no longer calling for heat.
  • 04Tripped high-limit switch cutting power to the elements.
  • 05A half-tripped breaker at the panel that looks fine but feeds the heater nothing.

Safe checks you can do now

  • Check the pilot window on a gas heater; if it's out, follow the relight steps printed on the unit's label.
  • Flip the electric heater's breaker fully off, then back on — a half-tripped one does nothing but looks set.
  • Press the reset button above the thermostat on an electric heater; if it clicks and the water reheats, make a note that it happened.
  • Check whether the water is cold everywhere or just one faucet — a single cold tap is a different problem than a cold tank.
  • Carefully feel the hot-side pipe leaving the top of the tank — warm there means the heater is producing and the trouble is downstream.

Where this stops being DIY

Call if the pilot won't stay lit, the breaker keeps tripping, or the reset button pops again the same day — those point to a failed part, not a fluke. A gas smell at any point skips every step above: get everyone out and phone your gas provider first.

(256) 415-7610

House-age angle: Homes built from the 1990s on in this area often sit on slab with the water heater in a closet or the attic, and many have a closed system with a small expansion tank on the cold side — builder-dependent, but a failed expansion tank shows up as odd hot-water behavior and a dripping relief valve. In pre-1960 houses, galvanized supply feeding the heater can choke flow so it reads as 'not enough hot water' more than 'none at all.'

How long should a water heater take to come back?

Most tank heaters recover in 30 minutes to an hour after being emptied. If it's been hours and the water is still lukewarm, the heater is usually working at half strength — a classic sign of one dead element.

Is a pilot light that keeps going out dangerous?

Not immediately, but it isn't a quirk to live with either. A pilot that won't hold usually means a failed thermocouple, and relighting it every few days just puts off the fix.

Related work: the water heaters page · what's in your walls · the fridge card

Call (256) 415-7610Emergency