Manitowoc Ice FLAKE/CHIPLET QF0400 - Manual (Page 112)

Electrical System Section 6
6-50 Part No. 80-1214-3
WATER LEVEL PROBES
Function
The water level probe protects the compressor if water is not detected.
Water contacting the probes will complete the circuit and energize the Water Level Probe light.
There are two water level probes; one probe is connected to the circuit board and one probe is connected to the ice
machine ground.
Water level probe operation can be determined by watching the Water Level Probe light. The Water Level Probe light
is on when water contacts the probe, and off when no water is in contact with the probe. The Water Level Probe light
functions any time power is applied to the ice machine, regardless of toggle switch position.
During the Water Fill and Freeze cycle, the water level probe monitors the water level. The water float valve maintains
the correct water level. If the water level is incorrect, refer to “Water Float Valve.”
Failure Modes
WATER LEVEL PROBE OPEN OR DISCONNECTED (ICE MACHINE WILL NOT START COMPRESSOR.)
Performs initial start-up procedure. Ninety seconds after ice machine enters Water Fill (1B), the ice machine will
initiate an Automatic Shut-Off cycle, flash the Water Level Probe light and remain off for 60 minutes. (Refer to “No
Water” SafeGuard for additional information.)
WATER LEVEL PROBE CLOSED OR SHORTED (ICE MACHINE WILL CONTINUE TO RUN.)
If the ice machine runs out of water with the water level probe shorted, the ice machine will initiate an Automatic Shut-
Off cycle and flash the Temperature light. (Refer to “Temperature is Too High or Too Low SafeGuard” for additional
information.)
CHECK PROCEDURE
WATER LEVEL PROBE OPEN OR DISCONNECTED
1. Determine which water level probe is connected to “water level” on the control board.
2. Remove water level probe from reservoir and place jumper wire from the water level probe to ground.
3. Move the toggle switch to the ICE position, wait
45 seconds, and then monitor the Water Level Probe light.
Step 3 Jumper water level probe to ground
Water Level light is: Compressor Cause
On Energizes
Control system is operating normally
Verify water level is correct.
Off
Remains
de-energized
Proceed to step 4.
WATER LEVEL
PROBE LIGHT
JUMPER FROM
WATER LEVEL
PROBE TO
GROUND
SV2042
Revised 8/2003