Manitowoc Ice QC0700 Electrical System, Section, 6-50, WATER LEVEL PROBES Function, Failure Modes

Electrical System Section 6

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	Proceed to step 4.
	de-energized
		JUMPER FROM
		WATER LEVEL
		PROBE TO
		GROUND

WATER LEVEL	SV2042
PROBE LIGHT

6-50 Revised 8/2003 Part No. 80-1214-3