Flushing the Heat Exchanger Error Code LC or

Rinnai V53E, V53I Flushing the Heat Exchanger Error Code LC or, Circulating Pump

Flushing the Heat Exchanger (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 build-up 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 4 gallons of undiluted virgin, food grade, white vinegar 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 1 hour at a rate of 4 gallons per minute (15.1 liters per minute).

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.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.

KEY

3/4" Ball Valve	Pressure Regulator
3/4" Ball Valve
3/4" Union	Circulating Pump
Check Valve	Boiler Drain Valve
Pressure Relief Valve	S Solenoid Valve

Water Heater

In-line
Filter	Gas Supply
	Gas Supply

V1 V2

CLEAN THERMISTORS

Remove and clean thermistors with a soft cloth or sponge after removing O-rings.

Cleaning solution is 4 gallons of undiluted virgin, food grade, white vinegar.

H3	V4
	V3

Cold Water Line Hot Water Line

Circulating Pump

16	V53i & V53e Operation and Installation Manual

V53I, V53E specifications

When it comes to reliable and efficient tankless water heaters, Rinnai stands out with its exceptional models, the V53I and V53E. These units are designed to provide a continuous supply of hot water, making them ideal for a variety of applications, from residential homes to small commercial settings.

The Rinnai V53I is an indoor model that boasts advanced technology and a compact design. Its main feature is the ability to deliver up to 5.3 gallons of hot water per minute, depending on the inlet water temperature, which ensures that households can enjoy multiple hot water outlets simultaneously without the fear of running out. The unit employs advanced energy efficiency standards, which can lead to increased savings on energy bills. Additionally, it comes equipped with the Rinnai Circ-Logic technology, enabling users to set recirculation patterns that ensure hot water is readily available when needed.

On the other hand, the Rinnai V53E is engineered for outdoor installation, with weatherproof capabilities that make it resilient against the elements. Just like the V53I, it produces up to 5.3 gallons per minute, ensuring ample hot water supply. Both models are equipped with a patented heat exchanger system, designed for optimal performance and performance longevity. This means that users can rely on consistent hot water production over the lifetime of the unit.

One of the standout characteristics of these models is their compact design, making them easy to install even in tight spaces. Rinnai’s tankless technology eliminates the need for bulky storage tanks, allowing for more functional residential and commercial space. The durability and reliability of both models are further reinforced by a commercial-grade heat exchanger that can withstand high-demand situations.

From a safety perspective, both the V53I and V53E include multiple safety features, such as freeze protection and a range of venting options, providing peace of mind to users. Rinnai also emphasizes sustainability, with their units promoting reduced energy consumption and emissions compared to traditional water heating systems.

In summary, the Rinnai V53I and V53E models offer advanced technology, efficient performance, and user-friendly characteristics. Whether indoors or outdoors, these tankless water heaters are designed to meet the demands of modern living while contributing to energy savings and environmental sustainability. With Rinnai’s reputation for quality and reliability, homeowners and business owners alike can trust these models to deliver uninterrupted hot water, season after season.