Rinnai R63LSE2 Flushing the Heat Exchange Error Code LC or, V1, H2 H1 Circulating Pump

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