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Flushing the heat exchanger
An LC0~LC9 or "00" or 58 diagnostic 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. Rinnai strongly recommends installation of isolation valves to allow for flushing of the
heat exchanger.
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 vinegar to circulate
through the water heater for at least 1 hour at a rate
of 4 gallons per minute (15.1 liters per minute).
9. Turn off the pump.
10. Rinse the vinegar from the water heater as follows:
a. Remove the free end of the drain hose (H3) from
the pail. Place in sink or outside to drain.
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 shutoff valve (V4). When unit has finished
draining remove the in-line filter at the cold water
inlet and clean out any residue. Place filter back
into unit and open valve (V4).
e. Close service valve, (V1), and open shutoff valve,
(V3).
11. Disconnect all hose
12. Restore electrical power to the
water heater.
Following flush procedure call
technical assistance (1-800-621-
)
9419
for PCB reset information.
3/4" Ball Val v e
3/4" Union
Ch eck Valv e
Pressure Rel ief Valv e
H3
H2
Circulating Pump
KB Series Manual
KEY
Pressure Regulator
CirculatingPump
Boiler Drain Valv e
S
Solenoi dVal v e
Rinnai
Water Heater
V2
V1
V4
V3
H1
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