Tankless Water Heater Repair
Diagnosed and Fixed by Technicians Who Know the Difference

Tankless Repair Isn't the Same Job as Tank-Style Repair

A tank-style water heater is mostly a big insulated tank with a burner or heating element — when it fails, the problem is usually mechanical and often visible: a leak, a rusted-out tank, a bad heating element. A tankless system is a different animal. It's a compact, electronically controlled unit that heats water on demand through a heat exchanger, with sensors, a control board, and often a digital display managing the whole process. When something goes wrong, the symptom is more likely to be a flashing error code on the unit's display than an obvious puddle on the floor — which means diagnosing it takes familiarity with that specific system's electronics, not just general plumbing experience.

Common Tankless Problems We See

• Error codes — every major tankless brand uses its own code system to flag a specific fault (ignition, flow sensor, overheating, exhaust blockage), and reading them correctly is the fastest way to a real diagnosis instead of a guess
• Mineral scale buildup inside the heat exchanger, especially common given how hard Utah's water is — scale insulates the heat exchanger from the water passing through it, forcing the unit to work harder and eventually triggering overheating faults or a drop in output temperature
• Ignition failure, often from a dirty flame sensor, a venting issue, or a gas supply problem rather than the burner itself
• Insufficient hot water flow — sometimes a demand issue, where multiple fixtures running at once exceed the unit's rated flow rate, and sometimes a sign the heat exchanger already has scale restricting flow

Descaling and Flushing: Maintenance Tank Systems Don't Need

This is the biggest maintenance difference between the two types of systems. A tank water heater doesn't need regular descaling in the same way — sediment settles at the bottom of the tank instead of coating an active heat exchanger. A tankless unit does, particularly on Utah's hard water: we recommend an annual descaling flush, circulating a mild acidic solution through the heat exchanger to dissolve mineral buildup before it restricts flow or damages the unit. Skipping this is one of the most common reasons we get called out for a tankless system that's "just stopped working" a few years after install — the fix often turns out to be years of built-up scale that regular flushing would have prevented.

Brands We Service

We work on tankless systems from the major manufacturers, including Navien and Rinnai, along with other leading brands — reading their specific error code systems and sourcing the right parts without a long wait.

Considering an Upgrade Instead?

If your unit is older, undersized for the home, or facing a repair that's a significant fraction of replacement cost, it may be worth comparing repair against a new install — see our tankless water heater installation page, or check our other tankless installation pages for Bountiful, Centerville, Farmington, and Layton. Otherwise, book online now and we'll get your current system diagnosed.