Electrolux EN18WI30LS Service Manual page 39

If the unit becomes saturated with lime or scale build-up, the hot water may not run smoothly, or the
unit may put out cold water. In addition, damage can occur resulting in failure of the unit if lime or scale
deposits are left untreated within the unit. To remove these deposits from the unit, follow the procedure
as explained below. To ensure full warranty coverage, hard, acidic, or otherwise impure water should be
treated with approved methods.
Note : Isolation valves will need to be installed in order to perform this procedure.
1. If not already on, turn the unit on with the Power Button on the Remote Controller.
2. Close the gas supply valve.
3. Close both the hot and cold water valves with a quarter turn of the main valve wing handle.
The handle will be perpendicular to the main valve body.
4. Ensure the drain valve lever handles are closed on both the hot and cold valves (the lever
will be perpendicular to the drain portion of the body) and slowly remove drain caps. Be sure to
retain the rubber washer inside of the drain cap.
5. Connect the pump outlet hose to the cold water drain valve of the isolation valve as shown in Figure 1.
6. Connect a drain hose to the hot water drain valve outlet of the isolation valve as shown in Figure 1.
7. Pour approximately 5 gallons of virgin food grade white vinegar or a solution of Lime Away
(or CLR) and water (diluted 3 parts water to 1 part Lime Away or CLR) into a bucket.
8. Place both the pump inlet hose and the drain outlet hose into the pail.
9. Open both drain valve lever handles on the isolation valves.
10. Turn the pump on. The unit will attempt to ignite (make sure that the gas has been turned off)
and a number "11" should flash on the remote controller after about 1 minute. Do not reset the unit.
Allow the solution to circulate for 45 minutes.
Note: It may take a few minutes to clear air out of the heater and hoses.
11. Turn the pump off and close the cold water drain valve of the isolation valve.
12. Remove the hose from the cold water drain valve and
replace cap and washer onto the drain valve outlet.
13. Remove the pump and hose from the bucket and empty
the solution.
14. Put the hot water drain hose end back into the empty
bucket and open the cold water main valve wing handle.
This procedure will flush out the heater with fresh cold water.
Flush for at least 5 minutes or until 20 gallons of water has
passed through the heater.
15. Close the cold water main valve wing handle and clean
the water inlet filter. Place the filter back into the unit.
16. Close the hot water drain valve lever handle, remove the
drain hose and replace cap and washer onto the hot water
drain valve outlet.
17. Open both the hot and cold water main valve
wing handles. Wing handles should now be
(OPEN) parallel to the main valve body and lever
handles should be (CLOSED) perpendicular to
the drain portion of the body, which is the normal
operating position.
18. Open the gas supply valve and reset the unit
by turning the power off and then on again using
the Power Button on the Remote Controller.
Periodic Maintenance
39
Hose
Water Inlet
Water
Outlet
et
Hose
Pump
Figure 1. Flush Set-up