Takagi Water Heater Error Code 29: How to Fix It

Q: Can I still use my Takagi water heater after error code 29?

No — you should not operate the unit until a thorough inspection has been completed and all damaged components have been replaced. Running water through cracked pipes or a cracked heat exchanger can cause flooding, water damage, and in gas heaters, potentially dangerous situations. Always fully assess and repair the unit before restarting it.

Q: Is error code 29 covered under Takagi warranty?

Freeze damage (error code 29) is typically considered a preventable installation or environmental issue and is generally NOT covered under Takagi's standard warranty. Warranties usually cover manufacturing defects, not damage caused by exposure to freezing temperatures. Contact Takagi customer support directly to verify the terms of your specific warranty.

Q: How do I prevent my Takagi water heater from freezing again?

Takagi tankless heaters have a built-in freeze protection feature that activates the unit's internal heater when temps drop near freezing — but this only works if the unit has electrical power. To further protect it: keep the unit powered during winter, insulate exposed pipes, install heat tape on vulnerable pipe sections, ensure the installation space stays above freezing, and never shut off power to the unit in cold weather.

Q: What parts are most commonly damaged by a freeze on a Takagi heater?

The most commonly freeze-damaged parts on Takagi tankless water heaters are the heat exchanger (copper coils), internal water pipes and fittings, the water flow sensor, the pressure relief valve, and inlet/outlet connection pipes. The heat exchanger is the most expensive and labor-intensive component to replace, so early freeze prevention is critical.

Q: How much does it cost to repair a Takagi water heater with error code 29?

Repair costs vary widely depending on what was damaged. Minor pipe or fitting repairs may cost $100–$300 in parts and labor. If the heat exchanger is cracked, replacement parts alone can range from $200–$600 or more, plus labor. In severe cases where multiple components are damaged, total repair costs can approach or exceed the price of a new unit, at which point full replacement may be more economical.

Abstract

Error code 29 on a Takagi tankless water heater indicates freeze damage — meaning one or more internal components have been damaged by freezing temperatures. This typically occurs when the unit is exposed to temperatures below 32°F (0°C) without adequate freeze protection, causing water trapped inside to expand and crack pipes, heat exchangers, or valves. Because freeze damage can involve cracked internal parts and water leaks, this is a high-severity error that requires prompt attention before operating the unit again.