Here's the secret real technicians run on: you don't memorize a thousand repairs — you learn one method. Continuity and voltage testing finds about 95% of all appliance faults, because almost every failure is one broken link in a simple circuit: power source → switch/control → load. Find which of those three fails the test, and you've found the repair. This is the exact method we use on every job — in plain English.
You only need a cheap digital multimeter. Here's the dial decoded — and exactly which setting each test uses.
| Symbol / setting | What it is | Use it to… |
|---|---|---|
| Ω (omega) | Ohms — resistance | Measure a load's resistance (element, motor, sensor). ~0 = good path; OL / "1" = open/broken. |
| •))) (sound waves) | Continuity — beeps on a good path | Fastest test for switches, fuses, thermostats, wiring. Beep = connected; silence = open. Power OFF. |
| V~ (or ṽ / VAC) | AC voltage | Check wall/appliance power — 120V or 240V. This is the "is power getting here?" setting. Power ON, careful. |
| V⎓ (or V=, VDC) | DC voltage | Low-voltage control boards, sensors, batteries. Rarely needed for basic appliance power. |
| A / mA (~ or ⎓) | Amps — current | Advanced: gas-igniter amp-draw. Most appliance current needs a clamp meter; the in-line A jack is fused + limited. |
| ▷| (diode) | Diode test | Checking diodes on control boards. Not needed for everyday repairs. |
Autorange meters (the dial just says "Ω" or "V~") pick the range for you — easiest to learn on. On a manual meter you choose a range higher than what you expect: ~200Ω for a heating element, 200V (or 600V) for wall power. Set the range too low and even a good part reads "1" or "OL."
That's the whole toolkit: Ω / continuity to find a broken path or dead part, V~ to confirm power. Every test below uses one of these two.
No matter the machine, power has to flow through three things in a chain. Break any link and the appliance stops. Your whole job is finding the broken link.
The electricity coming in — the outlet, cord, plug, and breaker.
Examples: 120V wall outlet, power cord, house breaker. Electric dryers, ranges, and ovens use 240V (two legs) — lose one leg and the machine acts half-dead (drum spins, no heat).
Anything that makes or breaks the path on command — the "gatekeepers."
Examples: door switch, lid switch, thermostat, thermal fuse, timer, relay, pressure switch, control board. These pass power only when conditions are right (door closed, temp low enough, etc.).
The part that actually does the work by consuming power.
Examples: heating element, motor, pump, valve coil, compressor, igniter. Loads usually fail open — which a continuity test catches instantly.
Confirm the outlet and cord deliver the expected voltage — 120V for most, 240V for electric dryers/ranges/ovens. No power here = it's the outlet, cord, or breaker, not the appliance. This one step saves a lot of wasted part-buying.
Unplug, then test each switch/control for continuity: a door switch, lid switch, thermostat, or thermal fuse should read continuity (near 0 Ω) when closed/latched and open when released. If it never closes the path, that gatekeeper is your fault.
Unplug, then test the load — element, motor winding, pump, valve coil — for continuity. A good load reads its characteristic resistance; an open (OL) reading = failed, replace it. This is the single most common finding of all.
That's it. Power in → gatekeeper passes it → load does the work. Whichever step fails its test is the repair. You just diagnosed like a pro.
| Reading | What it means |
|---|---|
| ~0 Ω / beep | Good continuity — the path or switch is closed and unbroken. |
| OL / infinite | Open — the path is broken or the load has failed. Usually your bad part. |
| 120V / 240V present | Power is arriving at that point as expected. |
| 0V where you expect power | Power isn't getting there — look upstream (breaker, cord, a switch that isn't closing). |
| Load | Roughly reads |
|---|---|
| Dryer heating element | ~10–50 Ω (open = burned out) |
| Oven bake element | ~15–40 Ω (open = burned out) |
| Drain / water pump motor | a few to ~20 Ω (open = dead) |
| Thermal fuse / thermostat (closed) | ~0 Ω / continuity (open = blown) |
| Oven temperature sensor | ~1,080–1,100 Ω at room temp |
Exact values vary by model — treat these as "is it in the ballpark or wide open?" An open reading is the clear tell almost every time.
The method covers the electrical ~95%. The exceptions worth knowing: sealed-system / refrigerant problems (compressor, leaks — licensed + EPA-certified only), mechanical issues (worn bearings, broken belts, a jammed impeller — found by feel and inspection, not a meter), and gas (the igniter is a load you can test, but the gas side needs a pro). And the microwave high-voltage capacitor is off-limits — dangerous even unplugged.
Send a 10-second video and a photo of the model number. For $50, a real technician tells you exactly which part failed the test — and we ship you the exact part or walk you through the fix. In Middle Tennessee or the Baton Rouge area, we'll come to you. 24/7.
They run one method, not a thousand memorized repairs: check power → check the switch/control → check the load, using voltage and continuity. Whichever fails its test is the repair. It works on washers, dryers, ovens, dishwashers, and fridges alike.
Voltage (power ON) answers "is electricity here?" Continuity (power OFF) answers "is this path/part unbroken?" You use voltage to check the power source and to see if a switch is passing power; continuity to test switches and loads with the machine unplugged.
OL (over-limit / infinite) on a continuity test means "open" — a broken path or a failed load. On a heating element or motor winding, OL means replace it. A good load reads its characteristic resistance instead.
Any inexpensive digital multimeter with continuity (beep) mode, ohms (Ω), and AC voltage will handle nearly every appliance test. You don't need a fancy one.
Ω (omega) = ohms/resistance, for testing loads. The sound-wave symbol •))) = continuity (it beeps on a good path) — best for switches and fuses. V~ = AC voltage, for checking 120V/240V power. V⎓ (or V=) = DC voltage, for control boards. A/mA = amps. Black probe goes in COM, red in the VΩ jack for almost everything. Use Ω/continuity with the power off, and V~ with the power on.
Sealed-system/refrigerant work, the gas side of a gas appliance, and anything involving a microwave's high-voltage capacitor. When you're unsure, send us a video — we'll tell you honestly whether it's a safe DIY or a technician job.