A tankless water heater throwing an error code or refusing to fire usually isn’t a catastrophe — most issues are scale, sensor, or venting problems that clear in one visit. I diagnose and repair tankless water heaters across St. Charles, Campton Hills, Geneva, and the rest of Kane County.
When you need a tankless repair
- The unit is throwing an error code on the controller
- Hot water is intermittent or takes much longer than it used to
- You hear unusual popping or rumbling from the unit (early sign of scale)
- The unit has shut itself off and won’t restart
- Water flow at the tap has dropped off noticeably
- You haven’t flushed it in over a year on hard water
- The condensate drain is leaking or backed up
- You’re hearing the burner cycling rapidly without producing hot water
What a service call looks like
- Diagnostic visit. I come out, hook up the diagnostic reader, and tell you exactly what’s wrong.
- Quote in writing. Before I touch the unit, you get the flat repair price. Parts, labor, and any code work in one number.
- The repair. Most issues — descaling, flame sensor, igniter, condensate float, inlet filter — get done in the same visit. Heat-exchanger or control-board replacements may need parts ordered.
- Test and verify. I bring the unit back online, run it through a heat cycle, and confirm flow and temperature at the farthest fixture before I leave.
- Warranty check. If your unit is still under manufacturer warranty, I file the claim for you on covered parts.
What it costs
Tankless repair pricing depends on what’s wrong, the parts involved, and the labor it takes. There’s no flat number that fits every job. What I can promise: a flat price in writing on the diagnostic visit, before any repair starts.
The fastest way to get yours is a phone call. Tell me the model and the error code on the controller and I can usually narrow it down on the phone.
Call 630-310-4736 — most calls answered live during business hours.
What’s on the truck
- Diagnostic reader for the major tankless brands
- Standard descaling and flush included on most service calls
- Common parts on hand for the brands I see most often
- Warranty status checked before quoting any heat-exchanger or control-board work
- If the manufacturer covers it, I file the claim
Local context
In Campton Hills and the wells west of Burlington Road, tankless service calls are overwhelmingly about scale. The water there runs hard, and an unsoftened tankless unit will throw a flow-rate or efficiency error on schedule. A flush clears it; a softener fixes it permanently.
In St. Charles and Geneva on municipal water, the more common service is flame-sensor cleaning (chloramines build a film on the sensor) and condensate drain maintenance. Different water chemistry, different repair pattern, both routine if you stay on top of them.
FAQ
Frequently asked questions
- My tankless is throwing an error code. What does it mean?
- Most tankless error codes boil down to one of four things: scale buildup, a flame-sensing fault, a venting blockage, or a flow-sensor issue. Tell me the model and code on the phone and I can usually narrow it down before I get there.
- How often does a tankless need to be flushed?
- On St. Charles or Geneva municipal water, once a year. On Campton Hills or Wasco well water without a softener, every six months. On softened well water, every 18–24 months. Most modern units have a service-due indicator that'll tell you when it's overdue.
- What does a flush cost?
- Pricing depends on whether your installer put isolation valves in (faster job) or didn't (more involved). Either way, I'll quote a flat price before I start. Give me a call and I can usually narrow it down on the phone.
- Is my unit still under warranty?
- Most major tankless brands carry a long heat-exchanger warranty (often a decade or more) and shorter coverage on parts. I can look up your serial number and confirm before quoting any major repair, so you don't pay for what the manufacturer should cover.
- I have no hot water at all. Is it the unit or something else?
- Could be either. The most common causes are a tripped condensate float switch (it filled and shut the unit off, easy fix), a flame failure on a dirty burner, or a clogged inlet filter. Less common but possible: gas valve failure or control board. Call me and we'll work through it.
- My tankless takes forever to deliver hot water. Is that normal?
- Not great, but common. The unit needs to fire and ramp up before it sends hot water down the line, that's 5–15 seconds. If it's taking longer than that, the issue is usually the cold-water sandwich (cold water sitting in the line between bursts of hot use) or undersized gas. A recirculation loop solves the first problem; a gas-line check fixes the second.
- What does a tankless repair cost?
- Repair pricing depends on what's actually wrong, the parts, and the labor involved. There's no flat number that fits every job. What I can promise: a flat price in writing on the diagnostic visit, before any repair starts. Give me a call and I can usually narrow it down on the phone.