5 Common Reasons Why Your Water Heater Stopped Working
A water heater can stop working for several reasons, from a simple pilot light outage to a failed heating element, and most of these problems are easy to diagnose once you know what to look for. Below are the five most common causes homeowners run into, along with when it's time to bring in a professional.
Pilot Light or Ignition Failure (Gas Water Heaters)
On gas water heaters, a pilot light that won't stay lit is one of the most common reasons for no hot water. This can happen because of a dirty or faulty thermocouple, a clogged pilot orifice, a draft blowing out the flame, or a failing gas control valve.
If the pilot won't relight after a couple of attempts following the manufacturer's instructions, or if you smell gas, stop and call a professional right away rather than continuing to try.
Thermostat Malfunction
The thermostat tells your water heater when to heat and to what temperature. When it fails, water may come out lukewarm, scalding hot, or not heat at all. A stuck or miscalibrated thermostat is a common culprit on both gas and electric units.
Before assuming the thermostat is bad, check that the setting hasn't been bumped and that the unit has power (electric) or gas supply (gas units).
Sediment Buildup in the Tank
Minerals in tap water settle at the bottom of the tank over time, forming a layer of sediment. This buildup insulates the water from the burner or heating element, reduces efficiency, causes popping or rumbling noises, and can shorten the life of the tank.
Routine flushing helps prevent this. If you've never flushed your tank, see our guide on how to flush your water heater.
Tripped Breaker or Blown Fuse (Electric Water Heaters)
Electric water heaters rely on a dedicated circuit. A tripped breaker, a blown fuse, or a failed high-limit safety switch will cut power to the unit entirely, leaving you with no hot water at all.
Check your electrical panel first. If the breaker trips again right after being reset, that usually points to a deeper electrical fault that needs a professional's attention.
A Broken Heating Element
Electric water heaters typically use one or two heating elements to warm the water. When an element burns out, you may notice water that's only lukewarm, water that runs out of hot water quickly, or a tripped breaker every time the tank tries to heat.
Heating elements are a common wear item and are usually straightforward for a licensed technician to test and replace.
Conclusion
Most water heater failures trace back to one of these five issues, and catching them early can mean the difference between a simple repair and a full replacement.
If you've worked through the basics and your water heater still isn't working, our team can diagnose the issue and get your hot water back safely. Schedule a water heater repair or call us today.
FAQs
Q1. Is it safe to relight my own pilot light?
Yes, for most gas water heaters the manufacturer's label includes safe relighting steps. If the pilot won't stay lit after a couple of tries, or you smell gas, turn off the gas supply and call a professional.
Q2. How do I know if I need a repair or a full replacement?
If your water heater is over 10-12 years old and experiencing repeated issues, replacement is often more cost-effective than continued repairs. A technician can help you weigh the two options.
Q3. How often should I flush my water heater?
Most manufacturers recommend flushing the tank at least once a year to remove sediment, especially in areas with harder water.
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