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" Union

Circulating Pump

Check Valve

Boiler Drain Valve

Pressure Relief Valve

S Solenoid Valve

Rinnai

Water Heater

In-line

Filter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

V3

V4

 

 

 

 

 

Hot

Cold

Gas

 

Supply

 

Water

 

Water

 

 

Line

 

 

Line

 

 

 

 

H2

H1

Circulating Pump

Manual - Rinnai Condensing Water Heaters

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Rinnai RC80E, RC98I, RC98E, RC80I Flushing the Heat Exchanger Error Code LC or, Circulating Pump, Clean Thermistors
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RC80E, RC80I, RC98E, RC98I specifications

The Rinnai RC80E, RC98I, RC98E, and RC80I are high-efficiency tankless water heaters that exemplify leading-edge technology and engineering. Designed to meet the demands of modern households, these units provide continuous hot water while offering energy savings and compact sizes.

Starting with the RC80E, this model features a maximum flow rate of 8 gallons per minute, making it suitable for smaller homes or multi-family settings. It incorporates Rinnai's Circ-Logic technology, allowing homeowners to customize their hot water recirculation. This means users can schedule hot water availability, ensuring comfort while minimizing water waste.

The RC98I and RC98E models elevate performance, boasting a maximum flow rate of 9.8 gallons per minute. The "I" in RC98I stands for internal, indicating its built-in temperature control and Wi-Fi connectivity options. This allows for remote monitoring and control via a smartphone app, enhancing user convenience. In contrast, the "E" in RC98E indicates it has an external setting, providing flexibility for homeowners seeking installation options that cater to their specific needs.

All four models feature Rinnai’s condensing technology, which utilizes a dual heat exchanger design for superior efficiency. This not only lowers energy costs but also reduces CO2 emissions, aligning with eco-friendly standards. Additionally, they operate at an impressive Uniform Energy Factor (UEF), which is crucial for energy-conscious homeowners.

Safety is a significant consideration in Rinnai’s design philosophy. The RC80E, RC98I, RC98E, and RC80I come equipped with multiple safety features, including overheating protection and venting safeguards, ensuring peace of mind during operation. Their compact size allows for versatility in installation, fitting into tight spaces and freeing up valuable room in your home.

Moreover, these water heaters are designed for longevity, featuring a durable construction that resists corrosion. Rinnai's commitment to quality is evident in their extensive warranty, proving their confidence in the product’s reliability.

In summary, the Rinnai RC80E, RC98I, RC98E, and RC80I units represent a blend of advanced technology, efficiency, and convenience. With significant flow rates, innovative features like Circ-Logic and Wi-Fi compatibility, as well as robust safety measures, they are an excellent choice for any homeowner looking to enhance their hot water experience while promoting energy efficiency.
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