What should I check first if my water heater pressure switch is tripping?

Check your water flow first. The pressure switch is a safety feature, not a glitch—don’t bypass it. Start by cleaning the filter, ensuring the pump runs at full speed with no timers interfering, and checking for air bubbles at the pump basket. If you have a variable-speed pump, increase the RPM. If that fails, look for a clogged impeller, closed valve, or sagging pool cover. Only replace the switch after confirming strong, steady flow—nine times out of ten, it’s a dirty filter or low pump speed.