Service manual

Lipton Brewed Iced Tea Training, Installation, & Service Manual
630460171 - 46 May 7, 2002
SERVICE ADVISORY
SERVICE ADVISORY
PRODUCT: LIPTON BREWED ICED TEA DISPENSER (LBIT)
SUBJECT: “HEATING, PLEASE WAIT” MESSAGE
ADVISORY RELEASE DATE: MARCH 23, 2001
Diagnostic Overview
A “Heating, Please Wait” message may appear during a programmed rinse. This message indicates that the
hot water temperature is less than the minimum temperature of 160 degrees Fahrenheit needed to initiate and
complete the programmed rinse cycle.
There are several possible causes if the message does not go out within 10 minutes-- 1) the thermostat needs
adjustment, 2) the solid state relay has failed, 3) the re-settable thermal fuse on the heater tank has opened, 4)
the heating element is bad, or 5) the displayed temperature is not accurate. If the dispenser has operated
normally for more than several days, then the most likely cause is that the thermostat needs adjustment. This
advisory provides a procedure to adjust the thermostat if the thermostat is determined to be the cause of the
“heating, please wait” message.
Before proceeding to adjust the thermostat, the service agent must first verify that the relay, re-settable thermal
fuse and heating element are operating normally. Please consult the Cornelius troubleshooting guidelines to
obtain specific diagnostic procedures for these components. If any of these components are found to be bad,
then replace the bad components and verify unit operation before proceeding to adjust the thermostat. Note--if
the thermal fuse or heating element are bad, then the entire water heater assembly must be replaced.
It is also a good idea to verify that the displayed temperature (as shown while in DATA mode) is within 5
degrees of the hot water temperature as measured during a 15 second dispense from the spigot. If not then
there could be a bad temperature sensor wire connection.
Thermostat Adjustment
Enter the SERVICE mode and check error messages. If the error display reads “Heater Lockout -- Call Service”
then the thermostat is adjusted too high, and must be adjusted lower. Otherwise, the heater thermostat is
adjusted too low and must be adjusted higher.
Switch power OFF using the power switch at the rear of the unit and unplug the power cord from the electrical
outlet. Remove the rear plastic housing and remove the cover on the back of the hot water tank to access the
heater thermostat. The thermostat has a dial that can be adjusted with a screwdriver to a higher or lower setting
as appropriate. It is recommended that the adjustment be made in no greater than 1/2 of the numbered
increments on the scale. Adjusting the thermostat dial clockwise to a higher numbered increment causes an
increase in hot water temperature. Once the appropriate adjustment has been made, replace the thermostat
cover and the rear housing, plug the unit back in and switch the power to ON.
Verify Hot Water Temperature
Enter the SERVICE mode and dispense hot water for 3 minutes continuously. This will reduce the tank
temperature to less than 100 degrees Fahrenheit. To clear the error message “Heater Lockout -- Call Service”
and to re-start the water heater -- exit the SERVICE mode and press the RUN key. Next, enter the DATA mode
to monitor the displayed tank temperature during the heat-up period. After approximately 20 minutes the tank
should be heated to it’s maximum temperature. Verify that the displayed temperature is between 172 and 185
degrees Fahrenheit. If not, then re-adjust the thermostat up or down as needed by repeating this procedure.