7.2.2 CF2 Chamber Filling Failure
Detection:
• Chamber full switch not activated in the first 4 min of filling (circulation pump not running yet).
If hot water unavailable or at low pressure, the unit will switch to cold water after 2.5 min if the
chamber full switch is not activated.
• Chamber full switch not activated in 4 min of filling with circulation pump running.
Remedy
:
1. Check if the water supply valves are turned
on and the water pressure is normal.
2. Check for blockages in the water inlet hose
filters.
3. Check for kinks in the water inlet hoses.
4. Possible cause is a malfunction of the
chamber level switch. Using the debug
screen, monitor if the chamber full switch
turns ON after filling. If not, remove the top
cover and the chemical bracket. Check the
level diaphragm / switch assembly and
repair or replace. If OK, proceed to step 5.
5. Possible cause is a leak. Remove the kick
plate and look for fluid in the pan. Isolate
and repair the source of the leak.
7. Troubleshooting
6. Using the debug screen and with the troubleshooting window in place, count the rpm's
when the temperature is at 50˚C. Upper and lower arm rpm's should be >= 25. If rpm's
are low, this indicates circulation pump failure. Replace the appropriate circulation pump
(upper or lower). If rpm's are OK, proceed to step 7.
7. There is a failure in one of the following
• thermostat
• pressure switch (lower wash arm)
• heater element
• pressure switch (upper wash arm)
Remove the top cover and the bottom cover. Check the heater element, lower arm
pressure switch and thermostat (in series) and the upper arm pressure switch.
Replace as required.
circulation pump
pressure switch
chamber full switch
Figure 22
Page 24
HYDR
IM
C51wd Service Guide
