Tankless units are clever machines, and that is both their strength and their weak spot. Instead of keeping forty or fifty gallons hot around the clock, a tankless heater springs into action only when water starts moving: a flow sensor detects demand, the control board fires the burner or elements, and water is heated on its way through the heat exchanger. Every step is watched by a sensor, and if any reading drifts outside its expected range, the board shuts the heater off and displays a code. For Dearborn, MI homeowners, that usually traces back to a short list of causes: scale building up inside the heat exchanger, a sticking or dirty flow sensor, an ignition problem at the igniter or flame rod, or a venting or gas supply issue the unit reads as unsafe.
Our approach to tankless repair is simple: measure first, replace second. When we arrive at your Dearborn home, we record the active code and the unit's fault history, then work through the systems behind it. Flow sensors are checked with water running to confirm they report demand correctly. Flame rods and igniters are tested electrically. Gas pressure is read at the inlet with the burner at maximum, because a line that holds steady at idle can sag badly under full load. The vent and air intake are inspected end to end, and the heat exchanger is judged by the temperature rise it achieves at a known flow. Only then do we recommend a fix, and we can show you exactly why.
We work on tankless heaters from Rinnai, Navien, Noritz, Rheem, Takagi, and the other major brands, gas-fired and electric alike. The fix depends on the diagnosis: a full descaling flush through the isolation valves when scale is choking the heat exchanger, a new flow sensor when the unit no longer notices a faucet opening, a fresh igniter or cleaned flame rod when ignition keeps failing, or a vent correction when the unit trips on combustion air. Sometimes the answer is bigger. A gas line undersized for the unit's full firing rate has to be upsized, and a heat exchanger cracked by years of scale may make replacement the smarter call on an older unit. We lay out every option honestly before any money is spent. Call (313) 540-8638 to schedule tankless repair.
Our most requested service is Water Heater Repair in Dearborn. Either is a good place to start.
Warning Signs to Watch For
Catching a symptom early is often the difference between a quick part swap and a tank that gives out on the garage floor. These are the red flags our technicians see most often before a breakdown:
- New whistling, roaring, or rumbling from the unit
- A clicking igniter with no flame, or a flame that lights and quickly drops out
- Cold slugs in the middle of hot water that last longer than before
- Hot water that cannot keep up with more than one fixture
- Outlet temperature that surges and sags while water is running
- No hot water at a low-flow faucet even though the shower works fine
- An error code flashing on the unit's display
- Water dripping from the cabinet or the condensate line
Don't Wait for a Total Failure
Tanks rarely fail all at once. They corrode from the inside for months, and the warning signs show up long before the floor gets wet. Call Dearborn Water Heater at (313) 540-8638 at the first sign of trouble.
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Why This Job Calls for a Pro
Tankless heaters look simple from the outside, but inside is a tightly controlled system. One fault code often has several possible causes, and the sensors, igniters, and control boards involved are not cheap to buy on a hunch. Gas models add real hazards: the burner can fire at close to 200,000 BTU per hour, the vent carries combustion gases that contain carbon monoxide, and a loose gas connection or a vent joint that separates can put fuel or exhaust into the living space. Electric models bring a different hazard, often drawing well over 100 amps across several 240-volt circuits, so a loose lug or undersized wire can overheat quickly.
A trained technician with the right instruments gets to the answer faster. Ours read the fault history, measure flame signal and igniter resistance, test flow sensor output, and check gas pressure under full load with a manometer, which is the only reliable way to catch a gas line that holds pressure at idle but sags when the burner ramps up. Descaling is done with a circulating pump and the proper solution, followed by a thorough rinse. Just as important, you get an honest opinion: if the heat exchanger is damaged on an older unit, you will hear it from us before you spend money on a repair.
Our Tankless Water Heater Repair Process
Our workflow is simple and thorough, so nothing gets missed between the fuel supply and the relief line. Here's exactly how a typical visit unfolds:
Code & Fault History Review
A code points us in a direction, and testing finishes the job. Flow sensor output, flame signal, igniter resistance, inlet gas pressure, and vent condition all get checked before any part comes out of the box.
Honest Answers & Upfront Price
Nothing is hidden. We walk you through the cause and the fix and give you the price up front. If the real problem is an undersized gas line or a worn-out heat exchanger, we tell you before anything is spent.
Targeted Repair
Most tankless repairs are finished in one trip: a descaling flush, a new flow sensor, igniter, or flame rod, a cleaned inlet screen, or a corrected vent connection.
Tested Under Load
We run hot water at several flow rates, confirm the unit lights reliably and holds temperature, and check gas pressure at full fire before we leave.
Not Sure What You Need?
Call Dearborn Water Heater to talk through your situation with an experienced technician.
Call (313) 540-8638 NowHow to Prevent Water Heater Problems
Routine maintenance is almost always cheaper and easier than an early replacement. Here are our recommendations:
- Consider a water softener or scale-reduction filter ahead of the heater if scale keeps returning
- Leave the power on in cold weather, since freeze protection only runs when the unit has electricity
- Keep the vent termination and air intake clear of leaves, nests, snow, and lint
- Have the gas line evaluated whenever you add a range, dryer, or fireplace
- Treat a code that returns after a reset as a symptom worth diagnosing, not ignoring
- Schedule a descaling flush every year; hard water may call for one every six months
- Rinse the small filter screen on the cold inlet every few months
DIY vs. Professional Tankless Water Heater Repair
Relighting a pilot by following the label is one thing. Diagnosing a gas valve, a burned-out element, a dirty flame sensor, or a tankless error code calls for meters and know-how that a pro brings. Here's how the two approaches stack up:
| Consideration | Doing It Yourself | Hiring a Pro |
|---|---|---|
| Diagnosis | Swap parts until the code clears | Each suspect part tested with a meter |
| Descaling | Partial flush that leaves scale behind | Pump-circulated flush through service valves |
| Combustion Safety | Venting and gas supply problems missed | Manometer test at full fire, vent inspected |
| Electrical Work | Exposed wiring and sensitive electronics | Power verified off, board handled correctly |
| Replacement Parts | Parts bought before the fault is known | Model-matched parts, often on the truck |
| Outcome | Symptom patched, cause remains | Lasting repair, confirmed by testing |
Talk to Our Tankless Water Heater Repair Team
Cold showers and damp floors don't get better on their own. Dearborn Water Heater can have a technician headed your way soon.
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We serve Dearborn and its neighboring towns for tankless water heater repair, from quick same-day repairs to planned installs.