Practical troubleshooting — written for maintenance techs, property managers, and anyone who fixes things for a living.
AC running but not cooling is one of the most common summer calls. Here's how to work through the 5 most likely causes in order — so you don't waste time replacing parts that aren't the problem.
HVACFurnace clicks but won't light? Here's how to diagnose the 5 most common causes in order — bad ignitor, dirty flame sensor, gas supply issue, pressure switch fault, or a locked-out control board.
PlumbingPilot keeps going out? The thermocouple is the culprit 80% of the time. Here's how to diagnose and fix a water heater pilot that won't hold — thermocouple test, pilot cleaning, draft check, and gas valve diagnosis.
AppliancesDisposal hums but won't spin? Almost always a jammed flywheel. Here's how to clear it with a hex wrench, press the reset, and diagnose what to do if it still won't start — with notes for InSinkErator, Waste King, Moen, and KitchenAid.
HVACThermostat screen completely blank? It's a power problem — breaker, fuse, C-wire, or transformer. Here's the 6-step diagnostic flow with manufacturer-specific notes for Nest, Ecobee, Honeywell Home, and Emerson Sensi.