Repair Library

16 guides

Documents · 80 free PDFs
Electrical & Lighting

Electrical Problem: Conservative Field Checks

Confirm the scope of what is dead, test the GFCI and breaker once, and unplug suspect loads. If a breaker trips again, if you smell burning, or if any panel or device needs to be opened, stop and call a licensed electrician. Do not take live readings unless that is your qualified, authorized work.

Electrical & Lighting

Lighting Problem: Flicker, Outage, and Controls

Count the fixtures. One fixture out is usually a lamp, driver, or ballast. A whole row or zone out is a circuit or control problem. Flicker after an LED retrofit usually means a driver or dimmer compatibility issue. Fixture wiring and ballast replacement is qualified work in most sites.

Electrical & Lighting

Breaker Keeps Tripping? What Facility Maintenance Can Check Safely

A breaker that repeatedly trips is signaling a real problem such as overload, short circuit, ground fault, or failing equipment. Identify what lost power, remove obvious loads, and do not keep resetting a breaker that trips again.

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.

Electrical & Lighting

Emergency Light Battery Won’t Hold a Charge? What to Check

If an emergency light fails its required test duration, first verify that normal power and charging are present. An aged battery is common, but charger faults, lamp problems, or loss of normal-power sensing can produce similar symptoms.

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.

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.

Electrical & Lighting

GFCI Won’t Reset? Safe Checks Before Replacing the Receptacle

A GFCI that will not reset is not automatically bad. Unplug connected equipment, check for moisture, verify upstream protection, and try one firm reset. If it trips again or shows heat, odor, or damage, take it out of service and escalate.

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.

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.

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.

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.

Electrical & Lighting

Occupancy Sensor Lights Turn Off Too Soon: Fix the Annoying Problem

Lights that shut off while a room is occupied usually have too-short delay, poor sensor placement, low sensitivity, blocked line of sight, or a technology mismatch.

Electrical & Lighting

Outdoor Light Won’t Turn On at Night: Photocell and Timer Checks

Exterior lighting that stays off at night may be controlled by a photocell, astronomical timer, BAS schedule, contactor, breaker, or fixture driver. Identify the control method first.

Electrical & Lighting

Power Strip or Surge Protector Keeps Tripping: Facility Troubleshooting

A power strip that repeatedly trips is often overloaded, damaged, or being used for high-wattage equipment such as heaters, microwaves, refrigerators, or coffee makers.

Electrical & Lighting

Breaker Panel Safety for Maintenance Technicians: When to Back Away and Call an Electrician

For an unqualified maintenance technician, a closed electrical panel is primarily an observation and escalation point — not an invitation to remove covers or work on energized parts.