Diagnostic service
Flickering, partial power, breaker trips, lost circuits - we start with the symptom and follow the path back to the real problem.
Electrical troubleshooting at Keil Electric starts with the symptom (flickering, partial power, breaker trips, lost circuits) and traces the path back to the cause: loose terminations, overloaded circuits, a failed device, a panel issue, or a fault further upstream.
Same scope on either side. Pick the shop that covers your area and we will route you to the right crew.
Diagnostics start with the observable symptom and trace the path back to the cause. The technician asks what's happening, when, under what conditions, and what's changed. The questions narrow the diagnostic plan before any tools come out.
A multimeter is just the start. Diagnostic visits also use clamp meters for live amperage, tone tracers for cable routing, outlet testers for wiring polarity, infrared thermometers for hot terminations, and circuit analyzers for ground impedance and load testing.
Loose terminations. Damaged conductors. Failed devices. Undersized circuits for the actual load. Shared neutral failures. Voltage imbalance. Panel issues. Utility-side problems. Each has a diagnostic path. We work through them in order from likely to less likely for the symptom.
Every diagnostic visit produces a written report: what we found, what caused it, what the fix is, and any related conditions worth addressing. The homeowner has a record whether or not we do the follow-up repair.
The flat diagnostic fee is disclosed when scheduling. When the homeowner books the repair with us, the fee credits toward the repair invoice. Diagnostics that reveal no repair is needed still incur the fee for the visit.
The first call captures what's happening, when, under what conditions, and what's been tried. The triage either dispatches an emergency, schedules a diagnostic visit, or walks through phone troubleshooting for symptoms that resolve without a visit.
The technician uses multimeter, clamp meter, tone tracer, infrared, and circuit analyzer as needed to trace the symptom to the cause. Most diagnostics run 60 to 90 minutes.
The diagnostic ends with a written summary documenting findings, cause, recommended fix, and any related conditions worth addressing.
When the diagnostic reveals work to be done, we quote the repair on the spot or follow up with a written quote. Larger scope (panel work, rewiring) gets a separate written quote.
For in-scope repairs we do the work. For larger scope, we schedule the follow-up. For diagnostics that reveal no repair needed, the homeowner has a clean report.
Not every job requires a permit. When the local AHJ requires one, we pull it, schedule the inspection, and stay with the job until it passes. No paperwork on you.
Written warranty: 5-year on outlets, fixtures, and EV chargers; 10-year on wire and breakers; lifetime on panelboxes and surge protection. Parts and labor. Transfers with the home.
Diagnostic work involves measuring live circuits and inspecting energized equipment. Don't open a panel cover without training. Don't probe wiring with anything other than properly insulated test gear. Don't assume a circuit is de-energized; verify with a multimeter at the device. Don't bypass safety devices to "test" if they're working; the test is functional, not destructive. Don't guess at cause when the diagnostic shows multiple possible causes; isolate one variable at a time. Diagnostics that reveal heat damage, smoke residue, scorched insulation, or melted equipment escalate to immediate de-energization and either repair on the spot or temporary safe condition with a scheduled return.
Real work from our San Diego and Austin shops. Same standards, same warranty, every job.
For electrical troubleshooting and diagnostics, here's the honest comparison. We'd tell you the same thing if we weren't trying to win the job.
Electrical troubleshooting is the work that happens when a problem doesn’t announce itself. Lights that flicker under load. Power that comes and goes. Breakers that trip with no obvious overload. Equipment that runs hot for no apparent reason. Devices that work intermittently. Half the property without power while the rest is fine. Each of these is a diagnostic problem before it’s a repair problem.
The diagnostic process starts with the symptom and traces the path back to the cause. Symptoms are observable. Causes are what produced them. Common causes for electrical symptoms include loose terminations, damaged conductors, failed devices, undersized circuits, shared neutral failures, voltage imbalance, panel issues, and utility-side problems.
Most diagnostic visits run 60 to 90 minutes. Complex issues that span multiple circuits or involve panel testing can run longer. We always disclose the diagnostic fee up front and apply it toward the repair when the homeowner books the work with us.
The technician arrives with the symptom in mind and a diagnostic plan. The plan typically follows: confirm the symptom (reproduce the problem if possible), trace the affected circuit from device back to panel, measure voltage and amperage at key points, check breaker condition and load, inspect panel for signs of heat or damage, and identify the cause.
Tools include a multimeter for voltage and continuity, a clamp meter for live amperage measurement under load, a tone generator and probe for tracing cables through walls, an outlet tester for checking polarity and ground, an infrared thermometer or thermal imaging camera for spotting heat at terminations, and a circuit analyzer for advanced diagnostics like ground impedance testing.
The output is a written summary: what we found, what caused it, what the fix is, and any related conditions worth addressing.
Lights flicker when the AC kicks on. The cause is usually voltage drop on the service entrance conductor (utility-side), a loose connection at the main lug, or a shared neutral that’s overloading. We measure the voltage during the AC startup and trace the cause.
Half the property loses power. The cause is usually a failed neutral somewhere upstream of the panel. The two hot legs of a residential service share a neutral. When the neutral fails, voltage between the two legs goes wonky and half the house sees high voltage while the other sees low voltage. This is dangerous to electronics and we treat it as urgent.
A breaker trips at random under low load. The cause is usually a damaged breaker, a fault on the circuit (intermittent short), or an AFCI dealing with a non-arcing condition that triggers its detection logic. We isolate the cause by load testing the circuit and inspecting the wiring at the device and the panel.
An outlet works sometimes. The cause is usually a loose connection at the back of the outlet (back-stab terminals are common offenders) or a damaged conductor where the wire enters the box. Vibration or temperature changes intermittently make the connection. We re-terminate properly with screw terminals and confirm by load testing.
Equipment runs hot. The cause is usually undersized wiring, a loose connection in the path, or equipment that’s drawing more than its nameplate rating because of a fault. We measure conductor temperature with infrared, measure load amperage, and inspect terminations.
A specific dead outlet on a known circuit usually points to: a tripped GFCI somewhere upstream on the same circuit, a tripped breaker, a failed device, or a loose connection. We can walk the homeowner through resetting GFCIs and breakers, and if those don’t resolve the issue, we schedule a diagnostic visit.
A breaker that just tripped during a known event (storm, equipment startup) usually resets cleanly and the issue is the equipment, not the breaker. If it doesn’t reset, the diagnostic visit comes next.
“All the outlets in my bathroom died” usually means a tripped GFCI. Most bathroom GFCI protection is on the bathroom’s GFCI outlet, with downstream outlets protected by it. Resetting the GFCI usually resolves the issue.
Anything intermittent. Anything that involves heat, smoke, or sparks. Anything that affects multiple circuits. Anything where the homeowner has already done the obvious resets without success. Panel issues. Service entrance issues. Anything where the utility is involved.
The diagnostic visit is a flat fee that gets disclosed when we schedule. The fee covers the technician’s time, the diagnostic tools, and the written report. When the homeowner books the repair work with us, the diagnostic fee credits toward the repair invoice.
Some diagnostics reveal that the existing system is fine and no repair is needed. The diagnostic fee still applies for the visit, but the homeowner walks away with a clean report and no further work.
Some diagnostics reveal larger issues than the original symptom suggested. We document the broader finding and quote the broader scope before doing the broader work.
Most electrical faults follow predictable patterns. The diagnostic process narrows the location and cause systematically rather than guessing. The general approach:
“The light does not work” is the start of the conversation, not the end. The full symptom includes: when it started, what changed when it started (a remodel, a storm, an appliance install, nothing), whether it is intermittent or constant, what other circuits or devices are affected, and what the homeowner has already tried.
Identify the circuit feeding the affected device. Find the breaker. Confirm the breaker position. Test the breaker itself with a meter (a tripped breaker reads zero volts on the load side; a broken breaker can read voltage but not deliver current).
From the breaker, trace the circuit through the panel, through any junction boxes, to the affected device. Confirm voltage at each point. The first point where voltage is missing is the fault location, or upstream of it.
Common failure modes have characteristic signatures:
Diagnostic work uses a small set of specialized tools:
One of the most challenging diagnostics is a circuit where the fault is at a junction box hidden behind drywall. NEC 314 requires every splice to be in an accessible junction box, but older work and amateur modifications often hide splices in walls.
The diagnostic process:
The fix often includes adding a proper junction box per NEC 314 and patching the wall opening. The diagnostic process is the slowest part, once the fault location is found, the repair is straightforward.
Every diagnostic visit ends with a written report:
The homeowner gets a copy. The repair, if approved, is quoted as a separate scope. Diagnostic work is billed by time at a documented rate; the repair price is fixed-scope. The homeowner sees the diagnostic cost before we start and the repair cost before we proceed.
Sometimes the diagnostic uncovers something larger than the original symptom. A single dead outlet turns out to be on a circuit with multiple loose terminations. A burning smell turns out to be at the panel’s main lug. A flickering light leads to a service-entrance neutral problem that warrants utility involvement.
When that happens, we stop, document what we found, and discuss the broader scope before proceeding. The homeowner makes the call on how far to extend the work. We do not silently expand the scope to grow the bill, the conversation happens before any additional work begins.
When the cause is unclear - power flickers and the breaker is fine, multiple devices stop working, lights dim under load, or a breaker keeps tripping with no obvious overload. We diagnose first, then quote the repair.
Panel review, suspect-circuit tracing, equipment check (where relevant), and a written summary of what we found and what the fix would be. The visit fee is disclosed before we start.
Sometimes yes - symptoms like a single dead outlet on a known circuit point to a clear cause. Symptoms like flicker under load, intermittent power, or unfamiliar smells need on-site testing.
Both locations apply the diagnostic visit fee toward the repair when the homeowner books the work with us. We confirm this on the first call.
Most diagnostic visits run 60-90 minutes. Complex issues that span multiple circuits or involve panel testing can run longer; we confirm before extending.
Pick the location closest to your property to reach the local team and request a real plan.
