Few things are more frustrating than turning on the shower and discovering there’s no hot water. For California homeowners, a broken water heater can disrupt daily routines, from showering and washing dishes to doing laundry. The good news is that most water heater issues have common causes — and in many cases, the fix is simple with the right help.
In this guide, we’ll break down the 8 most common reasons your water heater may not be working, how to spot the signs, and what you can do to get the hot water flowing again.
1. Thermostat Issues
The Problem:
If your water isn’t hot enough — or not heating at all — your thermostat might be incorrectly set or malfunctioning.
Signs to Look For:
- Water stays lukewarm
- Inconsistent water temperatures
- No hot water at all
Quick Fix:
Make sure the thermostat is set between 120°F and 140°F. If adjusting doesn’t help, you may have a failing thermostat that needs repair or replacement.
2. Sediment Buildup in the Tank
California’s hard water can cause a layers of sediment to build up at the bottom of your tank over time. This acts as insulation and prevents the burner or heating element from working efficiently.
Signs:
- Rumbling or popping noises
- Longer heating times
- Higher energy bills
- Less available hot water
Solution:
Have the tank flushed once a year. If the sediment is severe, a professional plumber may recommend a deep cleaning or new tank.
3. Faulty Heating Elements (Electric Water Heaters)
Electric water heaters depend on upper and lower heating elements. When one burns out, your water heater can’t heat properly.
Signs:
- Water that is only warm, not hot
- Hot water runs out quickly
- No hot water at all
Fix:
Heating elements can be replaced — a common, cost-effective repair.
4. Pilot Light or Ignition Failure (Gas Water Heaters)
If you have a gas unit, your burner can’t heat water without a working pilot light or ignition system.
What You Might Notice:
- No hot water
- Gas smell (turn off gas immediately if so)
- Pilot flame won’t stay lit
Fix:
You may need to relight the pilot or clean the thermocouple. If the ignition system is faulty, a plumber should handle the repair for safety.
5. Tripped Breaker or Electrical Issue
Sometimes, the issue is as simple as a tripped breaker, especially after storms, power surges, or high usage.
Fix:
Check your circuit breaker panel and reset if needed. If it trips repeatedly, you likely have a wiring or internal component issue that needs professional service.
6. A Failing or Old Water Heater
Most water heaters last:
- 8–12 years (tank models)
- 15–20+ years (tankless)
If your unit is near the end of its lifespan, parts begin to fail and breakdowns become more frequent.
Signs you need replacement:
- Rust-colored water
- Leaks around the tank
- Frequent repairs
- Rising utility bills
7. Leaks in the System
Even a small leak can prevent your system from building pressure and circulating hot water.
Look for leaks around:
- Tank
- Valves
- Piping
- Connections
If a tank is leaking from the bottom, replacement is usually the only safe solution.
8. High Water Pressure or Valve Problems
Water heaters rely on a properly working T&P valve (temperature & pressure valve). If water pressure is too high or the valve fails, the heater may shut down for safety.
Fix:
A plumber can replace the valve or install a pressure regulator to protect your system — and your home’s plumbing as a whole.
When to Call a Professional Plumber
You can do basic troubleshooting, but water heater systems involve gas, electricity, and pressurized hot water, making DIY repairs risky. If the problem persists or you see leaks, rust, or electrical issues, call a licensed professional.
Emergency Water Heater Issues
Contact a plumber immediately if you notice:
- The smell of gas
- Sparks, burning odor, or repeated breaker trips
- Water flooding or major tank leaks
- No hot water for more than 24 hours
These issues can become dangerous if ignored.
How to Prevent Future Water Heater Problems
- Schedule annual water heater maintenance
- Flush tank once a year
- Test T&P valve
- Replace anode rod every 2–3 years
- Install a water softener if you have hard water
A well-maintained system lasts longer, runs safer, and gives you more consistent hot water.
Need Fast Water Heater Repair in California? We’re Here to Help.
If your hot water stops working, don’t stress. The experts at Complete Plumbing Services provide:
✔ Water Heater Repair
✔ Water Heater Replacement
✔ Tankless Water Heater Services
✔ Emergency Water Heater Repair
✔ Gas & Electric Water Heater Solutions
With fast response times, honest pricing, and certified plumbers, we’ll restore your hot water quickly and safely.
📞 Call Complete Plumbing Services today for same-day water heater repair in California.
Your hot water comfort is just one call away!