No Hot Water? Here's What to Check Before Calling a Plumber
Nothing wakes you up faster than an unexpected blast of cold water in the shower. Before you assume your water heater is dead, though, run through a few quick checks. A surprising number of "no hot water" calls turn out to be something simple you can fix in five minutes.
Check 1: The breaker or pilot light
For electric water heaters, head to your electrical panel and check the breaker labeled for the water heater. A tripped breaker will usually be sitting in the middle position, not fully off or fully on. Flip it fully off, then back on.
For gas water heaters, check whether the pilot light is lit. Most units have a small window or panel where you can see the pilot flame directly. If it's out, most manufacturers include relighting instructions right on the unit, usually involving the gas control knob and a built-in igniter button.
Check 2: The gas supply
If your pilot light won't stay lit, or won't light at all, check that the gas supply valve leading to the water heater is fully open. It should be parallel with the pipe when open. While you're there, check whether other gas appliances in your home, like a stove or furnace, are working normally. If none of them are working, the issue may be with your home's gas supply rather than the water heater itself.
Check 3: The thermostat setting
It sounds obvious, but thermostats do get bumped, especially electric units with an accessible dial, or if someone in the house adjusted it and forgot to mention it. Confirm the setting is where you'd expect, typically around 120°F for a good balance of comfort and safety.
Check 4: The high-limit switch (reset button)
Electric water heaters have a safety device called a high-limit switch that trips if the water gets too hot, cutting power to the heating element as a safety measure. Most units have a small red reset button near the upper thermostat, often behind an access panel. If it's tripped, you'll usually need to remove the panel (with the breaker off first) and press the reset button firmly.
If the reset button trips again shortly after resetting it, don't keep resetting it repeatedly. A switch that keeps tripping is telling you something is genuinely wrong, usually a failing thermostat or heating element, and repeatedly forcing it back on isn't a real fix.
When to stop troubleshooting
This checklist is meant to rule out the easy stuff, not replace a full diagnosis. If you've checked the breaker or pilot, the gas supply, the thermostat, and the reset button and you're still without hot water, or if you smell gas at any point, it's time to call in help rather than keep guessing.
A gas smell in particular is not a DIY troubleshooting situation. Leave the house, don't operate any switches, and call your gas utility's emergency line, then have ProFlow Plumbing follow up once it's safe to do so. For everything short of that, if the quick checks above don't get your hot water back, a professional can usually pinpoint the actual failed component faster than continued trial and error.