Tankless Water Heater Repair Fountain Valley
Hot water went cold? Tankless water heater acting up? We do tankless water heater repair Fountain Valley homeowners call for when their unit quits. Whether it’s giving error codes, flashing lights, or no hot water at all—we can fix it fast.
We repair Navien, Rinnai, Noritz, Takagi, Rheem, and other major brands. From gas ignition failures to cold-water sandwiches, our plumbers know what to look for. We bring high-tech diagnostic tools like manometers, thermal scanners, and gas leak detectors to check every inch safely and fast. Most jobs are fixed the same day.
Our team knows what works and what wears out. Flow sensors, flame rods, blocked vents, clogged filters—whatever it is, we’ll spot it. Don’t wait till the system shuts down completely. Let’s get it working again.
Call us (714) 964-3519 or book online for local, licensed repair.
Story from Fountain Valley – Near Los Alisos Intermediate
Earlier this year, a customer near Los Alisos Intermediate School called because their tankless water heater kept shutting off mid-shower. It was a newer Navien, just out of warranty, and every time they tried running more than one fixture, it failed.
We showed up the same day, tested the unit, and found a dirty flow sensor and a half-clogged filter. Their water had been high in sediment, and the system hadn’t been flushed in over two years. After a full service and filter replacement, it ran like new again. We gave them tips for annual care and got them set up with a descaler.
Common Tankless Water Heater Problems We Fix
Tankless water heaters are reliable, but they still need care. Here are common repairs we handle in Fountain Valley, along with their typical error codes:
- Error Code 10 – Blocked flue or exhaust: often from bird nests, debris, or crushed vent pipe.
- Error Code 11 – Ignition failure: usually caused by a bad ignitor or gas supply issue.
- Error Code 12 – Flame failure: could be dirty flame rods, gas pressure problems, or blocked burner.
- Error Code 16 – Overheat warning: often due to scale buildup on the heat exchanger.
- Error Code 29 – Condensate drainage failure: caused by blocked or frozen drain lines.
- Error Code 61 – Fan motor failure: either the motor is worn out or the circuit board isn’t signaling right.
- Error Code 71 – Gas valve failure: typically from a stuck or defective gas valve.
- No Code/Cold Water Sandwich – Delay in hot water after start/stop use: often a sign the unit needs calibration or a recirculation setup.
If you hear clicking, see a code, or have no hot water at all—we’ll figure it out.
Need a Local Plumber? Contact Us Now!
Professional Plumbing provides free plumbing inspections for current homeowners during business hours. A small fee applies for homes in escrow or for sale, which can be credited toward repair costs if we're hired.
Why Routine Maintenance Helps
A lot of tankless repairs come down to one thing—no maintenance. See our Maintenance Page. Without flushing the system, scale builds up and blocks the heat exchanger. That causes overheating, sensor failure, and shutdowns.
We recommend flushing the system at least once a year. That keeps performance steady, avoids error codes, and helps your unit last longer.
DIY Tankless Repair Mistakes in Fountain Valley
We’ve had people try to replace flame rods or sensors without checking wiring. Others tried clearing vent lines using garden hoses—soaked their attic. One guy replaced a working flow sensor because a YouTube video told him to. Turns out the problem was a cracked ignitor wire.
Tankless systems aren’t like old tank units. They have boards, circuits, sensors, and specific pressure ranges. It’s easy to get it wrong.
If you tried to fix it and something’s still off, we can help. We repair half-finished DIY installs all the time.
Related Services
- Tankless Water Heater Flushing Fountain Valley
- Gas Line Repair Fountain Valley
- Plumbing Leak Detection Fountain Valley
- Water Pressure Regulator Fountain Valley
FAQs – Tankless Water Heater Repair Fountain Valley
It could be scale buildup, vent blockages, or flow sensor failure. We can diagnose the exact cause.
Typical repairs range from $150 to $600 depending on the problem. We give you a full quote before starting.
If it’s under 12 years old, yes. Most parts can be replaced without needing a new unit.
Most repairs take 1–3 hours. We keep common parts stocked in our trucks.
Not recommended unless you’re licensed. Mistakes can damage the unit or void your warranty.
