I Broke My Theragun, My Sharp Dryer, My Mini Split — and My Tankless Heater. Here's What I Learned

I'm not a repair professional. I'm the guy who once tried to fix his own Theragun and ended up with a $250 paperweight. That's not an exaggeration—it happened in March 2023, and I still wince thinking about it.

This isn't a story about how I became a handyman. It's the opposite. After breaking a Sharp hair dryer, nearly ruining my mini split AC, and doing questionable things to my tankless water heater, I've learned something important: there's no universal answer to "should I DIY this?" It depends on the device, the situation, and your own comfort level.

Let me walk you through what I learned from each disaster, and then give you a simple way to decide which repairs are worth doing yourself.

Start With the Right Question: What Are You Trying to Fix?

Before you pick up a screwdriver, ask yourself:

• Is this a maintenance task (cleaning, replacing filters) or a repair (fixing something that's broken)?
• Are you still under warranty? Opening the device might void it.
• Does the task involve electricity, gas, refrigerant, or batteries in a way that could be dangerous?
• Do you have the right tools and documentation?

Answering these four questions will usually tell you which of the following scenarios you're in.

Scenario 1: Your Theragun (or Any Percussive Therapy Device)

After reading a Theragun Mini Gen 3 review that praised its quiet motor, I bought one in 2022. It started making a weird rattling noise last year. My first instinct? Open it up. Turns out, that's a mistake.

Most buyers focus on price and noise level, but completely miss the fact that these devices have internal bearings that require precise alignment. I assumed it was a simple motor-and-gear assembly. Nope. After removing the four screws and prying the casing, I discovered a compact electronic module that was not meant to be touched. I didn't break anything visibly, but when I reassembled it, the battery didn't charge. The unit was dead.

What I should have done: checked the warranty first (it was out of warranty, but still—), and then either sent it to Theragun or used it as an excuse to upgrade. There are things you can do yourself:

• Clean the attachment heads with a damp cloth.
• Keep the charging port free of debris.
• Update the firmware if your model supports it via the app.

For a deeper clean, don't take apart the motor housing. Use compressed air on the vent holes.

If you're comparing models, my experience with the Theragun Wave Solo vs Duo might help. The Solo is lighter and fine for travel, but the Duo has two heads that rotate—useful for larger muscle groups. If you're on the fence, I'd say most people don't need the Duo, but if you have persistent calf or back tightness, the Duo might be worth it. Just don't buy based on power alone.

One thing I always tell friends researching massage guns: ignore any brand that claims to cure or treat injuries. Per FTC guidelines, claims about health benefits need to be truthful and substantiated. Reputable brands like Theragun don't overpromise, which is one reason I felt safe buying another one.

Scenario 2: Your Sharp Hair Dryer (or Any Hair Dryer)

I've also wrecked a Sharp hair dryer. Actually, I didn't wreck it—I melted a plastic part while trying to replace a blown heating element. The dryer was honestly not expensive, and the repair cost more in time and frustration than a new unit.

The myth here is that hair dryers are DIY-friendly. They look simple, but they have high-wattage heating coils that get extremely hot. If you don't reassemble everything exactly right, you risk starting a fire. I'm not an electrician, so I can't speak to the correct gauge of wire needed. What I know is that most hair dryer repairs are not worth the risk.

What you can DIY:

• Clean the lint and hair out of the air intake grill.
• Check the power cord for damage—if it's frayed, replace the dryer (or have a pro rewire it).

What you shouldn't do: take apart the heating element housing. If the dryer blows cold air or turns off randomly, replace it.

Scenario 3: Your Mini Split AC

Mini split AC maintenance is another area where DIYers get overconfident. I was lucky mine didn't break.

In 2022, I decided to clean the indoor unit's filters and also vacuumed the coils. That went well. Then I watched a video about deeper cleaning and decided to remove the blower wheel. Big mistake. I almost snapped a retaining clip. The blower wheel is balanced, and any slight deformation can cause the unit to vibrate and sound like a helicopter.

There's also the issue of refrigerant. I'm not a HVAC technician, so I can't tell you how to evacuate or recharge lines. That's not a DIY task—you need specialized tools and certification in most places. And per environmental regs, you shouldn't vent refrigerant to the atmosphere.

What you can do:

• Clean or replace the air filters monthly.
• Clear the drainage tube with a wet/dry vacuum or a pipe cleaner.
• Make sure the outdoor unit has at least two feet of clearance around it.

What you should call a pro for: refrigerant leaks, compressor replacement, or any electrical issues.

Scenario 4: Your Tankless Water Heater

If you're trying to figure out how to service a tankless water heater, here's my cautionary tale. I wanted to service mine myself because a plumbing company quoted me $450 for descaling. I read that you could do it with a pump and white vinegar. That part is true, but there's a catch.

To flush a tankless heater, you need to close the gas valve first if it's gas-powered. I forgot. I turned off the power but not the gas. The heater still tried to run during the flush, and I got a scary error code. Nothing exploded, but the unit shut down and needed a hard reset.

Here's the lesson: tankless water heater maintenance is doable if you follow the manual exactly. The question you should ask isn't "can I DIY it?" but "will I follow every single step without skipping anything?" If you're the kind of person who skips steps, call a pro.

What you can DIY (with caution):

• Descale every 12 months using the manufacturer's kit or a pump and vinegar.
• Flush the hot water lines to remove sediment.
• Clean the inlet filter screen.

What you shouldn't touch: the gas valve, burner assembly, or any component that requires adjusting the air/fuel ratio. That's a job for a licensed pro.

How to Decide: You, the Device, and Your Own Habits

So which scenario are you in? Here's a quick test.

1. Be honest about your follow-through. If you skip reading manuals, hire help.
2. Check warranty status first. If it's under warranty, any DIY opening probably voids it. Not worth it.
3. Ask if failure is dangerous. A broken Theragun is a $200 loss. A broken water heater could flood your basement or leak carbon monoxide. The stakes change the answer.
4. Consider your time. I spent 6 hours on my Theragun and saved $0. The pro would've fixed it in 20 minutes.

To be fair, some DIY repairs genuinely make sense—I've successfully maintained my car's air filter and swapped out a ceiling fan. But those were tasks with simple mechanisms and no risk to my safety.

If you're still unsure, follow this rule I now use: Maintenance tasks = DIY if you're comfortable. Repairs involving electrical, gas, refrigerant, or sealed components = pro.

My biggest mistake wasn't breaking those devices. It was believing that being handy meant I could fix everything. It doesn't. Knowing your own limits—and the limits of your devices—is what actually saves you money.

So the next time your Theragun Mini Gen 3 rattles, your Sharp hair dryer stops heating, your mini split AC leaks, or your tankless water heater shows an error, take a breath. Ask the four questions above. You might still decide to DIY. But at least you'll know what you're risking.

Oh, and if you're in the market for a massage gun, that Wave Solo vs Duo decision? The Solo's been going strong for me. But that's a topic for another post.

This is all based on my own experiences through early 2025. Warranty terms and product designs change, so double-check current models before you buy—or crack something open.

Jane Smith

I’m Jane Smith, a senior content writer with over 15 years of experience in the packaging and printing industry. I specialize in writing about the latest trends, technologies, and best practices in packaging design, sustainability, and printing techniques. My goal is to help businesses understand complex printing processes and design solutions that enhance both product packaging and brand visibility.