Tankless Water Heater Repair
Need tankless water heater repair? We read the code, test the gas, flow, venting and sensors, and replace only the part that failed, priced in writing first. Serving 120 cities.
- Error history read first
- Written quote before work
- Licensed local technicians
Fault found first
The code, the stored history and each suspect part are tested before anything is ordered.
Price agreed in writing
Parts and labor go on a written quote, and nothing starts until you approve it.
Licensed local techs
Repairs by licensed technicians who work in your part of town.
Tankless units only
One specialty: gas and electric tankless heaters that stopped doing their job.
One Kind of Heater, Fixed Properly
We work on one thing: tankless units that have stopped heating the way they should. Our tankless water heater repair starts at the display, moves through gas, flow, venting and sensors, and ends with the one fix that matches the fault, whether that is a flame rod, a flow sensor, a descale or, rarely, a new heat exchanger.
The Repairs We Handle
Error codes & ignition
Code 11, E003, 111 and their cousins traced to the gas supply, igniter, flame rod or venting, then fixed.
Descaling & flushing
Scale dissolved out of the heat exchanger through the service valves, with valves added if the unit has none.
Flow sensors, filters & leaks
Units that shut off mid-shower or drip from below get the flow sensor, filter, valves and fittings sorted.
Want a local visit? Find a technician near you · All 120 cities
An error code is a clue, not a death sentence.
Most tankless failures come down to one part, a clogged filter or a scaled heat exchanger. A new unit only comes up when the old one honestly can't be saved.
Why Homeowners Call Us First
The code is a starting point
Error codes name a system, not a part. Gas, flow, venting and sensors are measured before anything is replaced.
Parts tested before they're bought
A flow sensor or flame rod gets checked against the maker's values, so you don't pay for a part that wasn't broken.
Scale treated, not ignored
If scale caused the fault, the exchanger is descaled as well, so the same code doesn't return next month.
Run hard before we go
The unit is pushed with several taps open and its outlet temperature watched before the visit ends.
What Repairs Usually Cost
For tankless water heater repair, most homeowners pay an estimated $150 to $800 for parts and labor. Descaling is estimated at $150 to $350, and a heat exchanger replacement at $1,000 to $2,500.
Diagnosis & code check
- Stored error history read
- Gas pressure measured under load
- Flow, filter and venting checked
- A plain answer on what failed
Repairs & descaling
- Igniter, flame rod or sensor replaced
- Flow sensor or thermistor swapped
- Heat exchanger descaled
- Unit run at full demand afterwards
Heat exchanger & major parts
- Leaking heat exchanger replaced
- Warranty part claimed where it applies
- Control board or gas valve replaced
- Combustion checked after the swap
Ranges are estimates for typical jobs. The actual price is written down once the fault is found.
From First Call to Hot Water
- 1
Call
Give us the brand, the code and what the water is doing. You hear the likely cause and a cost range.
- 2
Test
History read, gas pressure measured, flow, venting and sensors checked in order.
- 3
Agree
The failed part and the price go on a written quote for you to approve.
- 4
Fix & run
The repair is made and the unit is run at full demand before we leave.
Tankless Faults We Fix Every Week
Code 11, E003 or 111
No ignition usually means gas pressure, a worn igniter, a dirty flame rod or a blocked vent. Each is tested.
Water under the unit
Drips come from service valves, fittings, the relief valve, the condensate line or the heat exchanger itself.
Code 10 or E110
Venting codes mean the unit can't breathe: a blocked termination, a nest, snow or a vent run that's too long.
Cold at one tap only
Usually a mixing valve or a cold-water crossover at that fixture, not the heater.
LC code on a Rinnai
The unit is reporting scale buildup. It needs a descale, and soon.
Display is blank
No power at the outlet, a blown fuse or a failed control board.
Frozen after a cold night
Lines feeding the unit froze, or freeze protection lost power.
Noisy or whistling
Scale, a struggling fan or a gas regulator issue, each of which shows up on testing.
Error code keeps coming back
A reset only clears the symptom. Repeated ignition or exhaust codes need a visit.
Need Tankless Water Heater Repair? Call Now
A unit that keeps throwing codes rarely fixes itself. The sooner it's tested, the more likely the fix is small.
Where We Work
120 cities in 25 states.
Washington
5 cities
University Place, Spanaway, Graham, Mercer Island, Lake Stevens
All Washington citiesTankless Water Heater Repair: FAQs
Question not covered here?
Call and ask. Someone who repairs tankless units answers, and the phone quote is free.
Call (380) 273-8196How much does tankless water heater repair cost?
Most tankless water heater repair costs an estimated $150 to $800, depending on the part. Descaling alone is estimated at $150 to $350, and a heat exchanger at $1,000 to $2,500. Nothing starts until you approve a written quote.
Can a tankless water heater be repaired?
Yes, in most cases. Igniters, flame rods, flow sensors, thermistors, fans, gas valves and boards are all replaceable, and scale can be descaled. A leaking heat exchanger on an old unit is the main exception.
What is the most common problem with tankless water heaters?
Scale in the heat exchanger, followed by ignition faults and flow sensor or filter problems. All three usually show up as a code or as water that won't stay hot.
Is there a reset button on a tankless water heater?
Most units reset by switching power off and on, or through the controller. A reset clears the code, not the cause; ignition and exhaust codes that return need a repair visit.
Why does my tankless water heater go hot then cold?
A brief cold slug after a tap reopens is the unit restarting. Swings during one shower usually mean flow below the unit's minimum, scale on the exchanger, or a failing flow sensor.
Book a Repair Visit Today
(380) 273-8196 reaches someone who works on tankless units every day. Describe the problem and pick a time.
Talk to a Tankless Technician
Handy to have when you call
- The brand and model from the label
- Any code on the display
- When the problem started, and what the water does