8.2.8 Wash Tank Heater and High Limit Thermostat
(All models except UL-100)
The wash tank heater is mounted in the bottom
of the wash tank sump. It maintains the wash
tank water temperature at a minimum of
150
°
F/60
°
C. The heater is protected from a low
water condition by a surface mounted high
limit thermostat. The UL-100 does not have a
wash tank heater or high limit thermostat.
Check the high limit thermostat before
replacing a suspected heater:
1. Push the POWER pushbutton off,
if machine is ON, to enter auto-shutdown.
2. Turn off main incoming power.
3. Remove lower front panel.
4. Push manual reset on high limit.
5. Pull one lead from high limit and check
for continuity. Replace if open.
6. Apply a coating of heat sink compound,
P/N 110563, to the high limit base before
mounting to tank.
To replace the wash tank heater:
1. Perform steps 1-5 above.
2. Open machine front door and
remove lower spray arm(s).
3. Remove round scrap screen and
pump intake strainer.
4. Disconnect heater wires and remove
retaining nuts.
5. Apply bead of sealing putty (Compound
440, P/N 104889 or comparable) to heater
flanges.
6. Install washers and insert replacement
heater in tank.
7. Install retaining nuts. Wipe off excess
sealing putty from inside tank.
8. Reconnect heater wires.
9. Restore power.
10. Check for leaks and proper operation.
11. Reinstall lower front panel.
Part 8:
COMPONENT REPAIR AND REPLACEMENT
Check high limit thermostat
Remove heater leads and retaining nuts
Remove heater from sump
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