Kenmore 505 - Manual (Page 32)

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
.
2
.
3.
4.
5.
6
.
7.
8
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9.
Disconnect electrical power to the water heater.
Close the shutoff valves on both the hot water and
cold water lines (V3 and V4).
Connect pump outlet hose (H1) to the cold water
line at service valve V2.
Connect drain hose (H3) to service valve V1.
Pour approximately 4 gallons of virgin, food grade,
white vinegar or citric acid into pail.
Place the drain hose (H3) and the hose (H2) to the
pump inlet into the cleaning solution.
Open both service valves (V1 and V2) on the hot
water and cold water lines.
Operate the pump and allow the cleaning solution
to circulate through the water heater for at least 45
minutes.
Turn off the pump.
a. 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.
d.
Allow water to flow through the water heater for
5 minutes.
Close service valve, (V1), and open shutoff
valve, (V3).
10. Disconnect all hoses.
11. Remove the in-line filter at the cold water inlet and
clean out any residue. Place filter back into unit.
13. Restore electrical power to the water heater.
3/4" Ball Valve
s
Pressure Regulator
3/4" Union Circulating Pump
Check Valve Boiler Drain Valve
Pressure Relief Valve
eia
Solenoid Valve
Figure 15
32 305 & 505 Indoor Manual