Practical troubleshooting — written for maintenance techs, property managers, and anyone who fixes things for a living.
The habits that turn a competent technician into one with a 3% callback rate — observation-first thinking, diagnostic sequencing, and root cause analysis. Built for experienced field techs who want to move more jobs per day with fewer callbacks.
HVAC TrainingThe habits that separate techs with low callback rates from the ones always chasing their own work. Practical training tips for new techs and veterans alike — observe before touching, build a diagnostic sequence, ask "why?" until the answer stops being a part.
HVACMisdiagnosing compressor failure as a refrigerant leak. Replacing a flame sensor when the real problem is a cracked heat exchanger. Here's the 5 mistakes that drive callbacks — and how a structured diagnostic sequence fixes them.
HVACEvery callback is a diagnosis that failed on the first trip. Here's the structured check sequence that separates techs with 5% callback rates from the ones running callbacks on every third call — and the math on why it matters.
HVACAC 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.
HVACAC running but blowing warm air? Check the thermostat, filter, and outdoor unit first — most calls resolve there. Here's the full 7-step checklist with fix times and cost ranges for every cause, from a clogged filter to a failed compressor.
PlumbingTop, middle, or bottom — where the water appears tells you what to fix and how urgently. Drain valve, T&P valve, anode rod, and tank corrosion diagnostics with cost estimates for every fix.
PlumbingWater at the base of your water heater? It's usually the drain valve, T&P relief valve discharge, tank corrosion, or condensation. Here's how to tell the difference — with safety warnings and cost ranges for every fix.
AppliancesDryer tumbling but producing no heat? It's almost always a blown thermal fuse, failed heating element, clogged exhaust vent, or gas igniter issue. Here's the 7-step diagnostic checklist — with safety warnings and cost ranges for every fix.
AppliancesFridge warm but freezer fine? Compressor not running at all? Dirty condenser coils cause the majority of no-cool calls. Here's the 7-step diagnostic checklist — with safety warnings and cost ranges for every cause.
AppliancesStanding water in the tub? Work through the drain-side sequence — from a clogged filter (DIY, zero cost) to a failed drain pump. Includes safety steps, multimeter diagnostics, and cost estimates for every repair.
ToolsiFixit is the go-to for consumer electronics teardowns. But for HVAC systems, commercial appliances, and building equipment, you need something different. Here's the honest comparison — AI diagnostics vs. static guides.