What's Usually Wrong When the Water Runs Cold
Most no-hot-water calls come down to a handful of failed parts, and we diagnose the actual cause instead of guessing. On electric tanks, a bad upper or lower heating element or a tripped thermostat is the most common culprit. On gas tanks, a failed gas control valve, a dirty or bent thermocouple, or a pilot that won't stay lit will leave you with a cold shower fast.
We also check the temperature and pressure relief (T&P) valve, since a valve that's stuck or dripping is a safety issue, not just an inconvenience, and we inspect the anode rod, which sacrifices itself to protect the tank from corrosion. If we find water pooling around fittings, we tighten or replace the leaking connection rather than let it turn into a bigger leak later.