Ignition Failures
Dirty flame rods, bad igniters and gas supply problems keep the burner from lighting. These are among the most common tankless repairs.
Tankless water heater repair
Reliable Tankless Water Heater Repair in Revere, MA
Flashing error code or cold-water sandwich? Get tankless water heater repair in Revere, MA from technicians who work on Rinnai, Navien, Noritz and Rheem units every week.
Call (781) 829-5444 and read off the error code if one is showing.
- All major tankless brands
- Error code diagnosis
- Gas & electric models
- Licensed MA Plumbers
- Fully Insured Work
- Upfront Pricing
- Tank & Tankless
- Respect for Your Home
Signs Your Tankless Unit Needs Service
A tankless water heater is a small computer wrapped around a burner and a heat exchanger. When something is off, it usually tells you, with a code on the display, a short burst of hot water followed by cold, or no ignition at all.
Book a tankless service visit if you see any of these:
- An error code on the remote or the front panel
- Hot water that turns cold mid-shower, then comes back
- The unit clicks or fans run, but the burner never lights
- Weak hot water flow at faucets that used to be strong
- A whistling, humming or rattling sound during use
- Water dripping from the bottom of the cabinet
Tankless units are only one part of what Revere Water Heater Pros handles, but they get specialist attention. A tankless plumber who knows each brand's codes and parts can often find the fault in minutes.
What gets fixed
Tankless Hot Water Heater Repair Problems Solved
Most tankless trouble falls into a few groups. Here is what technicians fix most often on units across Revere.
Scale in the Heat Exchanger
Mineral buildup chokes water flow and triggers overheat codes. Descaling restores performance and protects the exchanger.
Flow Sensor Faults
If the flow sensor cannot see water moving, the burner never fires. Cleaning or replacing it brings the heat back.
Venting and Air Supply Errors
Blocked intake or exhaust pipes, often from snow, nests or loose joints, cause shutdowns and must be fixed for safety.
Control Boards and Wiring
Power surges and moisture can damage the circuit board or sensors. Testing confirms the failed part before anything is replaced.
Leaks and Valve Problems
Worn service valves, pressure relief valves and internal fittings can drip. Small leaks are fixed before they reach the electronics.
Common Tankless Error Codes by Brand
Codes vary by model and age, so always check your manual. This table shows what some frequently seen codes generally point to.
| Brand | Code | What it usually means |
|---|---|---|
| Rinnai | 10 | Air supply or exhaust blockage |
| Rinnai | 11 | No ignition, often a gas supply or igniter issue |
| Rinnai | 12 | Flame failure after lighting |
| Rinnai | LC | Scale buildup, descaling needed |
| Navien | E003 | Ignition failure |
| Navien | E012 | Flame loss during operation |
| Navien | E016 | Heat exchanger overheating, often from scale or low flow |
| Noritz | 11 | Ignition failure |
| Noritz | 12 | Flame failure |
| Noritz | 90 | Abnormal combustion, often a venting problem |
Resetting a unit may clear a code for a while, but the underlying problem stays. If the same code keeps coming back, the unit needs a proper diagnosis.
What you get
What Your Tankless Service Visit Includes
Every tankless repair visit follows a thorough checklist, so the fix lasts and nothing else is missed.
- Error history check pulled from the unit's control board to see what has been happening over time.
- Gas pressure test with a manometer, since undersized gas lines are a common cause of tankless problems.
- Venting inspection from the unit to the outside termination, including joints and clearances.
- Inlet filter cleaning to clear debris that restricts flow.
- Upfront repair pricing and a plain explanation of what failed.
How it works
How Tankless Water Heater Servicing Works
Tankless units reward a careful, step-by-step approach. Here is how your visit runs.
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Share the code and model
Tell the dispatcher your brand, model and any code shown so the right parts come along.
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Test gas, power and flow
The technician checks supply pressure, power, water flow and venting before opening the unit.
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Repair the fault
With your approval, the failed part is cleaned or replaced and settings are verified.
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Run a full-flow test
Multiple taps are opened to confirm steady temperature at real household demand.
Is your unit showing a code right now? Call (781) 829-5444 and have it ready.
Why Revere chooses us
Why Revere Trusts Us With Tankless Units
Not every plumber is comfortable inside a tankless cabinet. These units need brand knowledge and the right test tools.
Brand-specific know-how
Technicians work on Rinnai, Navien, Noritz, Rheem and Takagi units and know the quirks of each.
Proper diagnostic tools
Manometers, multimeters and combustion analyzers confirm the cause instead of swapping parts at random.
Clear pricing
You see the cost before work begins, whether the fix is a quick cleaning or a new control board.
Get Endless Hot Water Flowing Again
A tankless technician can read the error history, test the unit and tell you the price to fix it upfront.
(781) 829-5444
Tankless guide
What Revere Owners Should Know About Tankless Units
A little background helps you keep your on-demand heater running smoothly for its full 20-year potential.
Why Gas Line Size Matters
A whole-home gas tankless heater can draw far more gas than an old tank heater did. If the original gas line was never upsized, the unit may light but starve when several taps run at once. That shows up as cold bursts, flame failure codes or noisy operation. A pressure test while the unit runs at full fire tells the story quickly.
Scale, Revere Water and Descaling
Revere's MWRA water is soft, so scale forms more slowly here than in hard-water towns. Slowly is not never. Over a few years, a thin crust still builds inside the heat exchanger, especially on units set to high temperatures. Yearly descaling with a pump and cleaning solution through the service valves keeps the exchanger clean. The water heater maintenance page covers the full process.
Winter Performance in Massachusetts
In January, the water entering homes in Suffolk County is much colder than in summer. Your tankless unit has to raise it by a bigger amount, which lowers the flow it can deliver at full temperature. If your unit keeps up in July but struggles in February, it may be undersized or need servicing. Freezing is another risk. Units on outside walls or in unheated spaces need intact freeze protection, and a power outage on a cold night can leave them exposed.
Repair or Replace a Tankless Unit?
Most tankless problems are repairable. Replacement starts to make sense when the heat exchanger itself leaks, when the unit is past 15 years and parts are hard to find, or when it was undersized from the start. If you need a new unit, see water heater installation for sizing and options.
Neighborhoods served
Tankless Water Heater Repair Near You in Revere
Tankless units are popular in the condo buildings along Revere Beach Boulevard and in renovated units around Revere Center, where a wall-hung heater frees up precious closet space. Near the shoreline in Beachmont and Point of Pines, salty air can corrode exhaust terminations, which makes yearly vent checks especially important.
In West Revere, North Revere and Franklin Park, many single-family owners switched from old tanks to tankless and now need their first major service. Multi-family owners on and around Shirley Avenue and in Oak Island rely on fast tankless fixes so tenants are not left without hot water.
Tankless Water Heater Repair FAQs
Can you fix a tankless water heater that shows an error code?
Yes. Error codes point to the area of the problem, such as ignition, flame, venting or overheating. The technician confirms the cause with tests and then repairs or replaces the failed part.
Why does my tankless water heater go cold in the middle of a shower?
Common causes include low gas pressure, a dirty flow sensor, scale in the heat exchanger or a demand that exceeds the unit's capacity. Each one has a different fix, so testing comes first.
Do you repair Rinnai and Navien tankless units?
Yes. Rinnai, Navien, Noritz, Rheem and Takagi tankless units are all serviced, including both gas condensing and non-condensing models.
How often should a tankless water heater be serviced?
Once a year is the general recommendation. A yearly visit includes descaling, cleaning the inlet filter and checking venting and combustion.
Is it worth repairing an older tankless heater?
Often, yes. Tankless units can last around 20 years. Unless the heat exchanger is leaking or parts are no longer made, repair usually costs much less than a new unit.
Get Your Tankless Water Heater Fixed by a Specialist
Call for tankless water heater repair in Revere and get a technician who knows your brand, your codes and your home.
Related Services for Tankless Owners
Water Heater Maintenance
Yearly descaling and filter cleaning prevent many tankless faults, so maintenance is the best way to avoid the next repair.
Learn more →Water Heater Installation
If your tankless unit is beyond repair or too small, a new install sized for winter demand is the next step.
Learn more →Gas Water Heater Repair
Gas tank heaters share supply and venting issues with gas tankless units, and this service covers pilots, valves and burners.
Learn more →