Fast Diagnostics for Endless Hot Water Systems

Tankless water heaters are marvels of modern engineering, providing endless hot water and incredible energy efficiency. However, because they are essentially high-powered computers that manage fire and water simultaneously, they require specialized expertise when something goes wrong. You can’t trust a “standard” plumber with the complex sensors and heat exchangers of an on-demand system.

At Riviance HVAC, we are tankless specialists. We provide precision repair services across Ann Arbor, Ypsilanti, Canton, Saline, and the surrounding areas. Whether your unit is displaying an error code or has simply stopped delivering heat, our team has the diagnostic tools to get your system back online fast.

Common Tankless Issues We Resolve

Because tankless units don’t store water, their failure points are often related to sensors, ignition, or mineral buildup. We expertly handle:

• “Mineral Buildup” (Scaling): Michigan’s hard water is the #1 enemy of tankless units. We provide professional descaling to clear the heat exchanger and restore flow and efficiency.

• Ignition Failure: Fixing issues with gas valves, spark igniters, or flame sensors that prevent the unit from firing up when you turn on the tap.

• System Overload: If your unit is shutting down when multiple showers are running, we diagnose whether it’s a component failure or a sizing issue.

• Exhaust & Venting Errors: Repairing blocked or improperly installed vent pipes that cause the unit to shut down for safety (often signaled by specific error codes).

• Sensor & Control Board Faults: Diagnosing the “brain” of the unit to ensure water flow and temperature sensors are communicating correctly.

• Cold Water Sandwich: Adjusting or repairing internal bypass valves to eliminate those annoying bursts of cold water during a shower.