121 practical guides

What are you trying to fix?

Start with the symptom. Routine fixes when you can handle them; clear handoff points when you should not.

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Fire & Life Safety

How to Conduct a Fire Drill

Prepare, evacuate, account for people, verify restoration and document follow-up, with original field photographs and a restoration clip.

By Jonathan Rice · Field guide
Fire & Life Safety

Carbon Monoxide Alarm at Work: Get Outside and Call 911

Carbon monoxide cannot be seen or smelled. A CO alarm or suspected exposure requires fresh air and emergency help even when there is no visible smoke or obvious equipment fault.

Safe first checks and clear handoff points
Plumbing

Several Restroom Drains Backing Up: Stop Adding Water

When a toilet, sink and floor drain back up together, treat the problem as a shared drainage issue. Repeated flushing can turn a blockage into a contaminated-water incident.

Safe first checks and clear handoff points
Plumbing

Create a Commercial Domestic-Water Shutoff Map

A usable valve map tells the next technician what a valve actually serves. Build it before a leak, without experimenting on occupied-building systems.

Safe first checks and clear handoff points
Electrical & Lighting

Breaker Keeps Tripping: What Maintenance Can Check Safely

A breaker that repeatedly trips is indicating overload, short circuit, ground fault, failing equipment, or a circuit problem. Maintenance can identify what loads were operating and isolate plug-in equipment, but repeated resets are not a repair.

Diagnose then escalate · Beginner
Leaks & Building

Ceiling Leak After Rain: How to Trace the Source

The wet ceiling tile is often not directly below the roof entry point. Rainwater can travel along decking, structural members, conduit, piping, or insulation. Trace the highest wet point you can safely access and record wind/rain conditions before assuming the roof penetration above the stain is the culprit.

Routine investigation · Beginner
Doors & Hardware

Commercial Door Won’t Latch: A Simple Alignment Checklist

A commercial door that closes but will not latch is often sagging slightly, rubbing, hitting a misaligned strike, or moving too slowly through the final inch. Use wear marks and door gaps to identify what shifted before filing or moving hardware.

Routine facility fix · Beginner
Preventive Maintenance

Commercial HVAC Filter Change Schedule: Stop Guessing and Use Condition

There is no universal 'change every 90 days' rule for commercial HVAC filters. Occupancy, construction dust, filter efficiency, outdoor-air load, runtime, and system design all matter. Build your interval from inspection history and pressure-drop data where available.

Routine PM · Beginner
Plumbing

Commercial Toilet Keeps Running: How to Diagnose and Fix a Flushometer

If a manual commercial flushometer will not shut off, close the control stop first. Common causes include a blocked metering bypass, debris under the diaphragm, damaged internal parts, the wrong repair kit, or inadequate supply pressure.

Routine facility fix · Beginner–Intermediate
Preventive Maintenance

The 10-Minute Building Walk That Prevents Expensive Problems

A consistent daily walk catches leaks, odors, hot/cold complaints, restroom issues, door problems, abnormal equipment sounds, and safety hazards while they are still small. The value comes from walking the same route and comparing today's building to yesterday's.

Routine PM · Beginner
Electrical & Lighting

Dead Electrical Receptacle: Safe First Checks for Facility Maintenance

A dead receptacle may be switched, protected by an upstream GFCI, on a tripped breaker, intentionally de-energized, or part of a wiring fault. Maintenance can check obvious upstream protection and compare nearby outlets without removing energized covers.

Safe first checks · Beginner
Preventive Maintenance

What to Document Before Calling HVAC, Plumbing, or Electrical Service

A good service call starts with evidence: exact location, symptom, equipment identity, controller readings, error codes, timing, affected areas, and what changed recently. Five minutes of documentation can prevent repeat trips and reduce diagnostic time.

Management routine · Beginner
Doors & Hardware

Commercial Door Closer Won’t Close the Door: What to Check

A commercial door that stops before latching may have the closer adjusted too slowly, weak spring power, binding hinges, weatherstripping resistance, frame misalignment, or building pressure. Check mechanical drag before turning closer valves.

Routine diagnosis · Beginner
Leaks & Building

Water Coming Under an Exterior Door: How to Find the Entry Path

Water at an exterior door can come through the threshold, failed sealant, door sweep, jambs, masonry joints, or exterior drainage that sends water toward the opening. Start outside and follow the path instead of immediately replacing weatherstripping.

Routine investigation · Beginner
Plumbing

Commercial Flushometer Won’t Flush: Beginner Troubleshooting Guide

A manual flushometer that will not flush usually has a closed or restricted control stop, a blocked handle/relief passage, worn internal parts, or insufficient building water pressure. Start with water supply and handle operation before opening the valve.

Routine diagnosis · Beginner
Electrical & Lighting

GFCI Receptacle Won’t Reset: Safe Checks for Maintenance Staff

A GFCI that will not reset may have no incoming power, an active ground fault, moisture, a failed device, or a downstream problem. Entry-level maintenance can unplug loads, dry the area, check known upstream protection, and test reset buttons—but should not open energized boxes.

Safe first checks · Beginner
HVAC

HVAC Condensate Drain Clogged: How to Clear a Routine Blockage

A clogged condensate drain can shut cooling down, overflow a pan, stain ceilings, and trip a float switch. Accessible drains can often be cleared with safe mechanical cleaning, flushing, or a wet/dry vacuum while leaving the safety devices intact.

Routine facility fix · Beginner
HVAC

HVAC Float Switch Tripped: What It Means and How to Reset It Safely

A tripped condensate float switch is a warning, not the root cause. The right fix is to correct the drainage problem, remove standing water, confirm the line drains, and allow the safety to reset naturally rather than bypassing it.

Routine facility fix · Beginner
Plumbing

P-Trap Leaking Under a Commercial Sink: How to Find and Fix the Leak

A leaking sink trap is usually caused by a loose slip joint, crooked washer, cracked nut, damaged tubular piping, or a partial clog that makes joints seep. Dry everything first, then run water and identify the first point that gets wet.

Routine facility fix · Beginner
Electrical & Lighting

Commercial LED Light Flickering: What to Check Before Calling an Electrician

Commercial LED flicker can come from a failing driver, loose lamp, incompatible dimming/control, unstable power, a failing retrofit tube, or occupancy controls. The most useful first step is defining whether the issue follows one lamp, one fixture, one control zone, or a whole circuit.

Safe first checks · Beginner
Doors & Hardware

Loose Commercial Door Lever Handle: How to Tighten It Correctly

A loose commercial lever is often caused by a loose set screw, rose/trim fasteners, through-bolts, or wear inside the lockset. Tighten the correct fastener and verify the latch works smoothly rather than simply cranking on the visible handle.

Routine facility fix · Beginner
Preventive Maintenance

Monthly Commercial Restroom Inspection Checklist

Restrooms generate a constant stream of small maintenance problems. A monthly inspection of flushometers, faucets, drains, partitions, accessories, caulk, exhaust, lighting, and hidden leaks catches water waste and user complaints before they become emergencies.

Routine PM · Beginner
Electrical & Lighting

Occupancy Sensor Light Won’t Turn Off: Easy Checks Before Replacement

Lights that stay on with an occupancy sensor are often caused by a long time delay, sensitivity settings, air movement, moving objects, line-of-sight traffic, or an override mode. Start with settings and the room before replacing the sensor.

Routine facility fix · Beginner
Doors & Hardware

Panic Bar Sticking: Routine Checks Before You Replace Hardware

A panic bar that sticks or does not fully retract can be caused by door sag, dirty latch areas, loose trim, misaligned strikes, or worn hardware. Because panic hardware is life-safety equipment, routine checks should stay conservative and the door must always release freely from the egress side.

Routine diagnosis · Beginner
Preventive Maintenance

How to Build a Preventive Maintenance Calendar That Actually Gets Done

A usable PM calendar is simple, equipment-specific, assigned to a person, and tied to recurring work orders. Start with critical assets and common failure points instead of trying to document every component in the building on day one.

Management routine · Beginner
Leaks & Building

Commercial Roof Leak: First Response Checklist for Maintenance Staff

The first job during a roof leak is not permanent repair—it is protecting people and property, controlling interior water, documenting the leak, and giving the roofer enough information to find the source. Safe documentation during the event often saves hours later.

Routine response · Beginner
Plumbing

Commercial Sensor Faucet Won’t Turn On: What to Check First

When a commercial sensor faucet will not run, separate the problem into sensing, power, water supply, and solenoid operation. Many easy fixes involve batteries, a dirty sensor window, closed stops, a clogged aerator, or a model-specific reset.

Routine facility fix · Beginner
Leaks & Building

Supply Diffuser Sweating: Why It Happens and What Maintenance Can Check

A sweating supply diffuser usually means the diffuser or nearby duct surface is below the room's dew point. High indoor humidity, missing duct insulation, air leakage around the boot, low supply temperature, or poor airflow can all contribute.

Routine diagnosis · Beginner
HVAC

Thermostat Says Cooling but Nothing Happens: Commercial HVAC Checks

When a thermostat shows a cooling call but the room is still warm, divide the problem into controls, airflow, and equipment response. Entry-level maintenance can safely verify schedules, setpoints, fan operation, filters, condensate safeties, and obvious alarms before escalating.

Routine diagnosis · Beginner
HVAC

VRF One Zone Not Cooling: How to Narrow Down the Problem

When one VRF indoor unit is warm but the rest of the system is cooling, the failure pattern is the biggest clue. Start with local controls, mode conflicts, airflow, sensors, branch components, and fault codes before assuming a system-wide refrigerant problem.

Diagnose then escalate · Intermediate
HVAC

Water-Source Heat Pump Not Cooling: Facilities Troubleshooting Checklist

For a water-source heat pump that runs but does not cool, verify thermostat demand, airflow, filter condition, loop-water availability, condensate safeties, and whether neighboring units are affected. Refrigerant and internal electrical diagnosis should be escalated.

Diagnose then escalate · Beginner–Intermediate
Leaks & Building

Water Stain Under an HVAC Unit: Roof Leak or Condensate?

A ceiling stain near HVAC equipment can come from condensate, chilled-water piping, roof leaks, sweating ductwork, or plumbing. The timing of the leak—rainy weather versus cooling operation—is one of the fastest ways to narrow it down.

Routine investigation · Beginner
Plumbing

Commercial Sink Water Too Hot: Safe First Checks

Water that is suddenly too hot can come from a failed mixing valve, changed heater setting, point-of-use tempering device, recirculation problem, or faucet cartridge issue. Measure temperature instead of guessing.

Routine facility fix · Beginner
HVAC

RTU Fan Runs but No Cold Air: What Maintenance Should Check

If the rooftop fan runs but supply air is not cooling, the airflow circuit is alive but the cooling stage may be locked out, not commanded, or unable to operate. Gather evidence before calling service.

Diagnose then escalate · Beginner
HVAC

Thermostat Temperature Reading Is Wrong: How to Check It

A thermostat that reads several degrees off may be influenced by sunlight, wall temperature, drafts, local heat sources, remote-sensor configuration, or calibration. Verify with a good thermometer first.

Routine facility fix · Beginner
HVAC

Weak HVAC Airflow in One Room: Easy Things to Check

One room with weak airflow usually points to a local restriction or control issue: blocked grille, closed damper, crushed flex duct, terminal-unit problem, or furniture obstruction.

Routine facility fix · Beginner
HVAC

RTU Economizer Damper Stuck Open: Signs and Safe Checks

An economizer stuck open can make a building humid, hot, cold, or pressurized. Maintenance can compare commanded versus visible damper position and check for obvious mechanical obstruction.

Routine facility fix · Beginner
HVAC

One Room Is Too Humid: Commercial HVAC Troubleshooting

High humidity in one room can come from excess outdoor air, low cooling runtime, exhaust imbalance, moisture sources, sensor error, or airflow problems. Measure temperature and relative humidity before changing setpoints.

Routine facility fix · Beginner
Doors & Hardware

Commercial Door Rubbing the Frame: How to Find the Cause

A rubbing door usually means hinges loosened, the door sagged, the frame shifted, weatherstripping swelled, or floor clearance changed. Use rub marks and reveal gaps before adjusting hardware.

Routine facility fix · Beginner
Doors & Hardware

Automatic Door Won’t Open: Safe Facility Checks

An automatic pedestrian door that will not open can be in the wrong mode, lose power, have a blocked sensor, remain mechanically locked, or have an operator fault. Keep routine checks external.

Routine facility fix · Beginner
Electrical & Lighting

Commercial Light Switch Not Working: Safe First Checks

A wall switch that appears dead may actually be part of an occupancy-control system, lighting contactor, BAS schedule, dimming system, or tripped circuit. Map what is affected before touching wiring.

Safe first checks · Beginner
Electrical & Lighting

Exit Sign Not Lit: Facility Troubleshooting Checklist

An unlit exit sign may have lost normal power, failed LEDs, a bad battery or charger, or internal electronics trouble. Document and correct it promptly because it is part of the egress system.

Safe first checks · Beginner
Electrical & Lighting

LED Tube Still Doesn’t Work After Replacement: What to Check

When a replacement LED tube stays dark, the issue may be wrong lamp type, incompatible ballast, ballast-bypass wiring, failed sockets, or no fixture power. Identify the retrofit method before swapping more lamps.

Safe first checks · Beginner
Electrical & Lighting

Fluorescent Light Humming or Buzzing: What It Usually Means

A buzzing fluorescent fixture can indicate an aging ballast, failing lamp, loose component, or magnetic ballast vibration. Heat, odor, flicker, or discoloration make the issue more urgent.

Safe first checks · Beginner
Leaks & Building

Cold Pipe Sweating: Condensation or a Plumbing Leak?

Water on a cold pipe is often condensation, especially on chilled-water and cold-water lines in humid spaces. Dry the pipe and watch where moisture reforms before calling it a leak.

Routine facility fix · Beginner
Leaks & Building

Water Stain on a Wall but No Rain: What to Check

A wall stain without rain can come from plumbing, condensate, chilled pipes, restroom fixtures, irrigation, stored roof water, or cleaning. Timing and location are your best clues.

Routine facility fix · Beginner
Leaks & Building

Cracked Exterior Sealant: When to Recaulk and When Not To

Failed exterior sealant can admit water and air, but smearing new caulk over old material rarely lasts. Proper repair means removing failed sealant, preparing the joint, and preserving designed drainage paths.

Routine facility fix · Beginner
Leaks & Building

Basement or Lower-Level Water After Heavy Rain: First Checks

Lower-level water after storms often comes from exterior drainage, foundation joints, floor drains, sump failure, window wells, or sewer backup. First separate clean rainwater from sewage and electrical hazards.

Routine facility fix · Beginner
Preventive Maintenance

Quarterly Commercial Door Inspection Checklist

Doors fail gradually through loose hinges, leaking closers, latch misalignment, damaged panic hardware, and worn seals. A short quarterly inspection catches these before they become security or life-safety problems.

Routine PM · Beginner
Preventive Maintenance

Monthly Commercial Roof Walk Checklist

A roof walk is about finding changes: blocked drains, loose debris, membrane damage, open flashings, standing water, and equipment-service damage. Use the same route and photos each time.

Routine PM · Beginner
Preventive Maintenance

Mechanical Room Monthly Inspection Checklist

A monthly mechanical-room walk catches water leaks, abnormal sounds, blocked access, dirty filters, pump issues, chemical storage problems, and changing gauge readings before they become shutdowns.

Routine PM · Beginner
Preventive Maintenance

Pre-Summer Commercial HVAC Checklist for Facility Teams

The best time to discover clogged condensate drains, dirty filters, failed fans, and dead thermostats is before the first hot week. Focus on airflow, drainage, controls, and obvious operation.

Routine PM · Beginner
Preventive Maintenance

Pre-Winter Building Maintenance Checklist

Winter preparation should focus on freeze exposure, heating operation, exterior doors, roof drainage, and spaces where cold air can reach piping. Do it before the first hard freeze.

Routine PM · Beginner
Preventive Maintenance

Commercial Water Heater Monthly Inspection Checklist

A monthly water-heater inspection should focus on leaks, temperatures, relief-valve discharge evidence, recirculation condition, unusual sounds, and housekeeping without casually operating safety devices.

Routine PM · Beginner
New · Facility Management

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