Tankless Water Heater Repair
in the Capital Region, NY

Each brand codes faults differently (ignition, flow, venting, overheat). We read the code on-site, confirm the real cause, and fix it — codes point us in the right direction but aren’t the whole story.

Most units reset by turning the power off at the unit or its breaker for about a minute and then back on, which clears many temporary faults. If the same error code returns, resetting is not the fix, and repeated resets can hide a gas, venting or flow problem. Do not open the cabinet. Call us with the code and we will tell you the likely cause.

Almost always hard-water scale in the heat exchanger. A descaling flush usually restores full flow — routine in our area.

The common sources are a loose or worn fitting at a connection, a clogged or frozen condensate line on a condensing unit, and, in the worst case, a cracked heat exchanger. Shut off the water to the unit, turn off its power, and call us. A fitting leak is a small repair; a failed heat exchanger is the case where replacement may make sense.

In the hard-water Capital Region, about once a year — more if you’re on a well without softening. Regular descaling prevents most tankless repairs.

A flush uses service valves on the unit to circulate a descaling solution through the heat exchanger, then rinses it clear. It removes scale that chokes flow, and it has to be done correctly on a gas unit because the unit is shut down and the valves reopened in order. We do it as part of a service visit, and our maintenance plan sets up a yearly one.

Sometimes. Same-day tankless repair depends on the fault, the parts it needs and the schedule that day, and visits run within business hours, Monday through Friday. Call or book online and dispatch tells you the soonest opening; a clear picture of the error code helps us plan the visit.

Common causes are a unit that has lost power, a closed gas valve, a failed ignition, a blocked vent or a clogged inlet filter. Flow can also be too low for the unit to switch on, which happens with a partly closed valve or a scaled heat exchanger. Check that the unit has power and that the gas valve is open. Do not open the cabinet. Call us if hot water does not return.

Yes. A tankless unit needs a minimum flow to fire. A very low flow, or a fixture with a clogged aerator, can make the unit shut off and send cold water through. If it happens at only one fixture, the fixture may be the problem rather than the heater.

The $99 pays for the visit that finds the fault: reading the code and testing gas supply, flow, venting and scale. Approve the work at that visit and the $99 comes off the price. Nothing starts until you have agreed to a single flat price.

Tankless units last 15–20 years, so repair is usually the right call. We recommend replacement only when the heat exchanger has failed or the unit is near end of life — and we tell you honestly.

Usually yes. Tankless units are built to last, so repairing one is often the better value, and we tell you when the heat exchanger or age says otherwise. Our own records show 51 tankless or combi units among 339 completed replacements, October 2021 to October 2026 (269 tank, 18 indirect, 1 heat pump). For replacement, see water heater replacement.