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).

Rinnai

Water Heater

 

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.

With (V4) closed, remove the in-line filter at the cold water

 

inlet and clean out any residue. Place filter back into unit

 

and open (V4).

13.

Restore electrical power to the water heater.

H3

In-line

Filter

V1 V2

V4

V3

Gas Supply

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 Outdoor LS Manual

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Rinnai R63LSE2 installation manual Flushing the Heat Exchange Error Code LC or, Rinnai Water Heater
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R63LSE2 specifications

The Rinnai R63LSE2 is a highly efficient and compact tankless water heater that offers an innovative solution for residential hot water needs. Designed with user convenience in mind, this model stands out for its performance, energy efficiency, and advanced technologies.

One of the main features of the R63LSE2 is its impressive flow rate, delivering up to 6.3 gallons per minute (GPM) of hot water. This capability allows households to enjoy simultaneous use of multiple fixtures, such as showers, sinks, and washing machines, without experiencing a drop in water temperature. This versatility makes the R63LSE2 an ideal choice for large families or homes with a high demand for hot water.

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The Rinnai R63LSE2 is designed for easy installation and maintenance. Its compact size means it can be installed in various locations, including utility closets, garages, or even outdoor spaces, maximizing flexibility for homeowners. Furthermore, Rinnai provides comprehensive customer support and warranty options, ensuring assistance and reliability for users.

With a stylish design and durable construction, the R63LSE2 not only serves as a functional appliance but also complements the aesthetics of contemporary home designs. It represents a perfect combination of innovation, efficiency, and reliability for those seeking an effective water heating solution. Overall, the Rinnai R63LSE2 is an exceptional choice for anyone looking to upgrade their hot water system.
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