my sun joe spx3000 pressure washer won't start at all, what do i check?

DIAGNOSIS The Sun Joe SPX3000 is a high-pressure electric unit that relies on a specific sequence of electrical and hydraulic conditions to engage the motor. When the unit fails to start entirely—meaning there is no humming, no clicking, and no ...

my avid power cordless drill won't turn on at all, battery is in, what's wrong?

DIAGNOSIS When an Avid Power 20V cordless drill fails to power on despite the battery being inserted, the issue typically stems from a break in the electrical circuit between the battery cells and the motor. In most home DIY scenarios, this is cau...

my new mysa thermostat says 'no power' on the screen and my baseboard heaters are cold, did i wire it wrong?

DIAGNOSIS The "No Power" message on a Mysa Smart Thermostat indicates that the device's internal power circuitry is not receiving the necessary 120V or 240V input from the electrical panel. Unlike low-voltage thermostats that rely on a C-wire from...

my heat won't turn on, the thermostat just says 'heating' but i hear nothing from the furnace.

DIAGNOSIS When your Emerson Sensi Lite ST26 displays "Heating" but the furnace remains dormant, it indicates a "Call for Heat" has been successfully initiated by the thermostat's internal relay. The ST26 is completing the circuit between the R (po...

honeywell t9 installed but my heat won't turn on. system mode is set to heat and temp is higher than room temp, but nothing happens.

DIAGNOSIS The Honeywell Home T9 (RCHT9610WFSW2003) is a power-hungry smart thermostat that relies on a constant 24VAC supply. When the screen is active and the temperature is set above the room ambient, but the heat fails to engage, the issue is t...

just installed a honeywell t9 and the heat won't turn on, house is cold

DIAGNOSIS This issue typically stems from one of three root causes: a wiring mismatch during the installation of the RCHT9610WFSW2003, a tripped safety switch at the furnace, or an incorrect system configuration in the T9 software. Because the T9 ...

my nest thermostat e just went blank and won't turn on, no lights or anything, what do i do?

DIAGNOSIS The Nest Thermostat E has completely lost power, meaning the internal battery has depleted and it is no longer receiving a 24VAC charge from your HVAC system. Unlike a software glitch where the screen might freeze or show an error code (...

my mr coffee 5 cup mini brew coffee maker won't turn on at all, no light, nothing. help?

DIAGNOSIS When a Mr. Coffee 5-Cup Mini Brew shows zero signs of life—no LED power indicator, no heating element activation, and no audible clicking—you are dealing with a complete break in the electrical continuity. Because this model uses a s...

my elite gourmet single serve coffee maker won't turn on, power light doesn't come on

DIAGNOSIS The Elite Gourmet EHC113M is a minimalist machine, meaning its power circuit is relatively simple but highly dependent on a complete electrical loop. When the power light remains dark, the root cause is almost always a break in that loop...

my filter's power adapter has a green light but the unit itself has no lights at all, not even red. is it dead?

DIAGNOSIS The green light on your Aquasana AQ-5200 power adapter is a "status indicator" for the transformer itself, confirming that the adapter is receiving AC power from your wall outlet. However, it does not guarantee that DC power is successfu...

dewalt impact wrench feels weak, barely spins, is the battery dead?

DIAGNOSIS The issue described—where a 12V cordless tool feels weak or barely spins—is rarely a total battery failure but is typically a symptom of "voltage sag" or a failure in the electrical path between the battery cells and the motor. Becau...

my delonghi ecam22110sb won't turn on at all, no lights

DIAGNOSIS A complete power failure on the De'Longhi Magnifica S ECAM22110SB, where no LEDs illuminate on the control panel, indicates a total interruption of the electrical circuit. This is rarely a software glitch and is almost always a hardware-...

i left it off for a week and now it won't turn on at all, no lights, nothing. is it dead?

DIAGNOSIS The complete absence of LED indicators on the control panel of the Euhomy IM-01 typically indicates a total break in the electrical circuit. When a unit is left powered off for an extended period, the most common culprit is not a "dead" ...

craftsman cmcd710 drill feels super weak, like it has no power. what's wrong?

DIAGNOSIS This loss of power in the Craftsman V20 CMCD710 is typically not a motor failure, but a mechanical mismatch between the tool's settings and the resistance of the material. The "weak" feeling usually manifests in one of two ways: either t...

my dyson v8 won't turn on at all, just completely dead. any ideas?

DIAGNOSIS When a Dyson V8 Absolute completely loses power, the root cause is almost always a failure in the electrical circuit between the battery cells and the trigger switch. This is typically caused by "cell exhaustion," where the lithium-ion c...

Won't Turn On / No Power

When your device refuses to power on, the cause is almost always one of a few things: a power supply issue, a tripped safety switch, a blown fuse, or a dead battery. Before assuming the worst, work through the basics — you'd be surprised how often the fix is a tripped GFCI outlet or a safety interlock that wasn't engaged.

100 troubleshooting answers across 11 product categories