Tankless Water Heater Repair & Service
Error Code On The Wall? We Speak Tankless.
Serving Greater Los Angeles & Southern California. Diagnosis, repair, and descaling for Navien, Noritz, Rinnai, and Rheem. Licensed, insured, owner-operated.
✓ CA C-36 Licensed & Insured
✓ Same-Day Service Available
✓ Free Estimates
✓ Owner-Operated
✓ Se Habla Español
Most tankless problems in Southern California come down to one thing: our water. Hard water is a consistent problem from the San Gabriel Valley to the San Fernando Valley to Orange County, and a tankless unit heats water by running it through a narrow heat exchanger at high temperature. That's the perfect environment for scale to build up. Scale restricts flow, makes the unit work harder, and eventually throws an error code or knocks the burner out entirely. The second most common cause is a unit that was never maintained. Tankless heaters are sold as low-maintenance and homeowners hear "no maintenance." They need an annual descaling flush, and without it a unit rated for twenty years starts failing at eight. The third is installation — units that were undersized for the house, vented incorrectly, or hooked to a gas line too small to feed them at full fire. Most tankless problems are repairable. Before you replace a unit, it's worth having someone who works on them regularly actually diagnose it.
Why Tankless Units Fail Across Southern California
What We Repair
Error Codes & No Hot Water
Every manufacturer uses its own code system, and the code tells you where to start looking — ignition failure, flame rod, air supply, exhaust blockage, gas pressure, flow sensor. We pull the code, test the actual component, and tell you what it costs to fix before we do anything. A lot of codes that look catastrophic come down to a dirty flame rod or a blocked intake screen.
Descaling & Flush Service
Scale is the number one killer of tankless units across Southern California. We flush the heat exchanger with a circulation pump and descaling solution, clean the inlet filter, and check the burner. If your unit has service valves it's straightforward. If it doesn't, we install them so the next flush is simple. Annual descaling is also what keeps most manufacturer warranties valid.
Manufacturer Warranty Replacements
Sometimes the right answer isn't a repair at all — it's a full unit replacement covered by the manufacturer's warranty. If your tankless is within its warranty period and the damage qualifies, the manufacturer may approve a complete unit swap at no parts cost to you. We handle the entire process: diagnosing the failure, contacting the manufacturer on your behalf, removing the old unit and transporting it to their approved location, processing the warranty claim, picking up the new unit, and reinstalling it at your home. You end up with a brand new water heater at the cost of labor only — we handle all the logistics so you don't have to navigate the manufacturer process yourself.
Brands We Repair & Service
We repair and service Navien, Noritz, Rinnai, Rheem, Bosch, Takagi, and State tankless units throughout Greater Los Angeles and Southern California. Tankless is our deepest specialty — it's what we install most, and diagnosing them is a different skill than working on a tank heater. We come with the descaling equipment, service valves, and common replacement parts on the truck, which means a lot of repairs get finished on the first visit instead of turning into a second trip. If your unit is under manufacturer warranty we'll tell you and help you use it rather than selling you a part you can get free.
What To Expect
A repair visit starts with the actual diagnosis — error code history, gas pressure at the unit, venting, water flow, and a look at how the unit was installed in the first place. You get a clear explanation of what's wrong and a flat-rate price before any work starts. Our $49 diagnostic fee is credited toward the repair. If we find the unit isn't worth repairing — a cracked heat exchanger on a fifteen-year-old unit, for example — we'll say so plainly and show you why, then give you replacement options without pressure. Most repairs and descaling services are completed in a single visit, usually within two hours.
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Call or Text
Same-day service available in most areas
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Upfront Quote
$49 diagnostic, credited toward the repair
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Professional Repair
Professional Repair — Most repairs completed in one visit
Tankless Water Heater Repair Across Greater Los Angeles
If your tankless is throwing a code, running cold, or you can't remember the last time it was flushed, give us a call — we serve Pasadena, the San Gabriel Valley, Greater LA, the San Fernando Valley, and surrounding Southern California communities.
Frequently Asked Questions
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Once a year across most of Southern California, given how hard our water is. If you have a water softener you can often stretch it further. If you've never had yours flushed and it's more than three years old, that's the first thing worth doing.
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Usually not. Most codes point to a specific serviceable component — a flame rod, a flow sensor, a blocked intake, a venting issue. Write the code down and give us a call; it tells us a lot before we even arrive.
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Depends on age and what failed. Under ten years with a component failure is almost always worth repairing. Fifteen-plus years with a cracked heat exchanger usually isn't. We'll show you what we found and give you both numbers, then let you decide.
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That's the cold water sandwich, and it's the most common tankless complaint across Greater LA. It happens because there's already-cooled water sitting in the line between the unit and the fixture. Sometimes it's fixable with a setting change or a recirculation loop, sometimes it's inherent to how the system was laid out.
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Yes. Most of our tankless repair calls across Southern California are on units another company installed. We'll diagnose it the same way and tell you what we find.
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Yes, and it's the main reason units fail early across Southern California. Scale coats the heat exchanger, restricts flow, and forces the burner to overwork. A softener plus annual descaling is the single best thing you can do for the lifespan of a tankless unit.
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No — tankless manufacturers cover the unit itself, not the labor. If your heater qualifies for a warranty replacement, the manufacturer provides the new unit at no parts cost, but you still pay a licensed plumber to remove the old unit, handle the transport and warranty process, and install the new one. We're upfront about that from the start so there are no surprises. What you're getting is a brand new heater at the cost of professional labor — which is still a significant savings compared to buying a new unit out of pocket.
Get Your Hot Water Back Today.
Same-day tankless diagnosis and repair from a licensed C-36 plumber who specializes in these units across Greater Los Angeles and Southern California. $49 diagnostic, credited toward the repair, and a flat-rate price before anything starts. Call or fill out the form below.