Moyer Diebel 201HT M4 Series, Installation & Operation Manual

Page: 71 / 120

201HT, 201LT - Timer Board Diagnostic Testing
Diagnostic Testing for the Solid State Timer Board, P/N 0712105
Beginning with S/N W150350341 and above
1
Before testing, Press the dishwasher power switch to OFF/DRAIN and allow the machine
to complete the drain cycle.
Check the incoming voltages.
2
With the Power switch in the OFF/DRAIN position,
press the START button 2 times.
If the drain valve opens and closes 5 times
then the DRAIN VALVE is okay.
4
START
Press and release the START button.
If the green cycle indicator light flashes then the
START BUTTON is okay.
3
Open the door. Indicator light
Indicator light
If the green cycle indicator light blinks continuously
for 10 seconds, then the DOOR SWITCH and the
CYCLE LIGHT are okay.
5
With the Power switch in the OFF/DRAIN position,
press the START button 3 times.
The timer board and the following components
are okay if the components run consecutively for
a few seconds in the following order:
1. Fill Valve
2. Detergent Pump
3. Rinse-aid Pump
4. Drain Valve opens and then closes
5. Wash Pump
6. Drain Pump or Sanitizer Pump
PRESS START THREE TIMES
PRESS START AND RELEASE
PRESS START TWO TIMES
0512979 rev. B
6
Troubleshooting - See below if one or more of the components in Step 5 did not run.
CONDITION
POSSIBLE CAUSE/SOLUTION
A single component in Step 5 does not run. Check the component that did not run.
Wash pump only component that runs (Except UH330B, 601HT) Check timer bd 4A fuse. (All except UH330B & 601HT)
Wash pump only component that runs (UH330B, 601HT ONLY)
Wash pump only component that won’t run. 4A/8A fuse okay.
Check timer bd 8A fuse. (UH330B & 601HT ONLY)
Check pump/motor - see troubleshooting guide.
None of the components in Step 5 run. Check neutral wire - see troubleshooting guide.
START
OFF
(DRAIN)
ON
POWER START
START
63