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
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
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 |
Water Heater
| |
Filter | Gas Supply |
|
V1 V2
H3 | V4 |
| V3 |
Cleaning solution is 4 gallons of undiluted virgin, food grade, white vinegar.
Cold Water Line Hot Water Line
H2
H1
Circulating Pump
16 | Manual - Rinnai Condensing Water Heaters |
