Skip to main content
Sevierville, Pigeon Forge, and Gatlinburg

Plumber in a Box

Water Heater Troubleshooting: Common Problems

Diagnose common water heater problems and learn when repairs are needed versus replacement.

Booking

Reserve a visit

Step 1 of 3
Select the service type
Start with the closest issue category
March 1, 2025
Plumbing Team
5 min read

Waking up to a cold shower is a frustrating way to start the day. When your water heater acts up, it can disrupt your entire household. Understanding the most common problems can help you diagnose the issue and decide whether it's a simple fix or time to call a professional.

Problem: No Hot Water

This is the most common complaint. The cause depends on whether your heater is gas or electric.

Gas Heater

The most likely culprit is an extinguished pilot light. Check to see if it's lit and follow the manufacturer's instructions to relight it. If it won't stay lit, the thermocouple may be faulty.

Electric Heater

First, check your circuit breaker to see if it has tripped. If not, the problem is likely a failed heating element or thermostat, which will require professional repair.

Problem: Not Enough Hot Water

If your hot water runs out much faster than it used to, consider these possibilities.

📏
Undersized Heater: Your household's demand for hot water may have increased beyond the tank's capacity.
Sediment Buildup: A thick layer of sediment at the bottom of the tank reduces its capacity and insulates the water from the burner or heating element. The tank needs to be flushed.
🔥
Faulty Component: In an electric heater, one of the two heating elements may have failed. In a gas heater, the thermostat could be malfunctioning.

Problem: Strange Noises

Rumbling, popping, or whining sounds from your tank are usually a sign of trouble.

Common Noises and Causes

  • Popping or Rumbling: This is almost always caused by sediment buildup. Steam bubbles get trapped under the sediment and boil, creating noise.
  • Screeching or Hissing: This can indicate high pressure building up in the tank or a partially closed valve creating water turbulence.
  • Ticking: This can be normal heat expansion in the pipes, but if it's new or loud, it's worth getting checked.

Problem: Leaking Water Heater

A leak is a serious issue that needs immediate attention.

If you see water pooling around the base of your water heater, it often indicates that the tank itself has corroded and failed. In this case, the unit cannot be repaired and must be replaced immediately to avoid a major flood.

Leaks can also come from fittings, valves, or pipes connected to the tank, which are often repairable. A professional can determine the source.

Water heater problems can be complex and involve high temperatures, pressure, and electricity or gas. For safe and reliable troubleshooting and repair, contact the experts at Plumber in a Box. We can diagnose the problem and advise you on the best course of action.

Final call

Need a plumberup in the Smokies?

Book plumbing service directly here for homes, cabins, and rental properties across the Smokies, or call if you want to talk through the job first. From leak repairs and drain issues to water heaters and everyday service calls, the schedule is built to handle real property details cleanly.

Booking

Reserve a visit

Step 1 of 3
Select the service type
Start with the closest issue category