Flushing the Heat Exchange (Error Code: LC or 00)

An “LC” or “00” error code indicates the unit is beginning to lime up and must be flushed. Failure to flush the appliance will cause damage to the heat exchanger. Damage caused by lime buildup is not covered by the unit’s warranty. After flushing, reset the LC fault code by turning off the power to the unit and turning the power back on.

1.Disconnect electrical power to the water heater.

2.Close the shutoff valves on both the hot water and cold water lines (V3 and V4).

3.Connect pump outlet hose (H1) to the cold water line at service valve (V2).

4.Connect drain hose (H3) to service valve (V1).

5.Pour approximately 4 gallons of virgin, food grade, white vinegar or citric acid into pail.

6.Place the drain hose (H3) and the hose (H2) to the pump inlet into the cleaning solution.

7.Open both service valves (V1 and V2) on the hot water and cold water lines.

8.Operate the pump and allow the cleaning solution to circulate through the water heater for at least 45 minutes.

9.Turn off the pump.

10.Rinse the cleaning solution from the water heater as follows:

a.remove the free end of the drain hose (H3) from the pail

b.close service valve, (V2), and open shutoff valve, (V4). Do not open shutoff valve, (V3).

c.allow water to flow through the water heater for 5 minutes

d.close service valve, (V1), and open shutoff valve, (V3).

11.Disconnect all hoses.

12.Remove the in-line filter at the cold water inlet and clean out any residue. Place filter back into unit.

13.Restore electrical power to the water heater.

Rinnai

Water Heater

In-line

 

Filter

Gas Supply

 

V1 V2

H3

V4

V3

5 gallon pail of virgin, food grade, white vinegar (or virgin, food grade, citric acid).

 

KEY

3/4" Ball Valve

Pressure Regulator

 

3/4" Union

Circulating Pump

Check Valve

Boiler Drain Valve

Pressure Relief Valve

S Solenoid Valve

Cold Water Line Hot Water Line

H2

H1

Circulating Pump

16

VA Series Indoor LS Manual

Page 15 Page 17
Page 16
Image 16
Rinnai REU-VA3237FFU installation manual Flushing the Heat Exchange Error Code LC or, Rinnai Water Heater
Page 15 Page 17

REU-VA3237FFU specifications

The Rinnai REU-VA3237FFU is a high-efficiency gas continuous flow water heater designed to provide instant hot water on demand. It is particularly well-suited for households that require a reliable source of hot water while maximizing energy savings. This unit boasts impressive features that set it apart in the market, catering to both residential and commercial applications.

One of the standout characteristics of the REU-VA3237FFU is its energy-efficient design. With an impressive energy factor of 0.89, this model delivers exceptional performance, maximizing energy use and minimizing waste. The continuous flow technology means that there is virtually no wait time for hot water, making it ideal for busy households with multiple points of use.

The REU-VA3237FFU employs advanced temperature control technology. It features an intelligent digital controller that allows users to easily set their desired water temperature. This ensures consistent delivery of hot water at the desired temperature, enhancing comfort while also promoting safety by reducing the risk of scalding. The model also incorporates a safety lock function that can prevent accidental changes to the temperature setting.

In terms of durability and design, the Rinnai REU-VA3237FFU showcases high-quality build materials that contribute to its longevity. The stainless steel heat exchanger is resistant to corrosion, ensuring a long life expectancy and reliable performance over time. Additionally, the compact design makes it easy to install in tight spaces, whether indoors or outdoors, adapting to various installation environments.

Moreover, the Rinnai REU-VA3237FFU features a low NOx emission system, aligning with environmental standards and regulations. This eco-friendly technology makes it an excellent choice for environmentally conscious consumers looking to reduce their carbon footprint while enjoying the benefits of modern hot water systems.

The Rinnai REU-VA3237FFU is also equipped with a self-diagnostic system, which allows for easier maintenance and troubleshooting. This feature increases the unit's reliability by monitoring its performance and alerting users to any potential issues before they develop into significant problems.

In summary, the Rinnai REU-VA3237FFU is a standout continuous flow water heater that combines energy efficiency, durability, and advanced technology. With its smart temperature control, compact design, and environmentally friendly features, it is an outstanding choice for anyone seeking a dependable and efficient hot water solution.
Top Page Image Contents