STERO SG, Service And Parts Manual

Page: 53 / 93

TROUBLESHOOTING
TOGGLE DIAGNOSTICS
Toggle diagnostic screen is a useful tool for understanding the operation of the dishwasher. Toggle diagnostic
screen allows values from the water level sensors in millivolts and water temperature in °F to be monitored in real
time. There are other values monitored as shown on the Toggle Diagnostics graphic Fig. 60.
Real time means the numbers are constantly updating. The target number may be difficult to visualize because it
will only be displayed for a short period of time.
The key to using this screen is knowing whether the numbers should be increasing, decreasing or staying relatively
constant.
For example, if you are filling the booster or holding tank, the water level millivolt reading should be increasing.
• When the target of 830 mV is reached, you may not see 830 mV, but it will trigger the control board to energize
Booster Relay K5. D78 will light and the Millivolt reading will still be increasing.
• When the target value of 1400 mV is reached, you may not see 1400 mV, but it will trigger the control board
to de-energize Fill Relay K3. D76 will go out. The millivolt reading remains somewhat steady. You will still see
the numbers move around due to the water still heating.
NOTE: Toggle diagnostic screen can be accessed two ways: through SERVICE PROGRAMMING (8934), or by
shorting service pins (SVC) on control board if unit is in CONTROL PANEL SERVICE POSITION.
Fig. 60
ERROR CODES
The error codes will display as a result of the control board monitoring the operation of the machine. You will have
to follow troubleshooting procedures in order to correct the problem.
There can be more than one error occurring during a cycle. If there are multiple errors, the left side of the display
will have an up arrow
↑
and a down arrow
↓
indicating the need to scroll through the errors using the up and down
arrows on the control panel.
SG, SU-L, SU-H DISHWASHERS - TROUBLESHOOTING
Page 53 of 59 F45577 (1215)