Gasboy DEF Atlas - Manual (Page 15)

MDE-5044A Atlas® DEF Operation, Diagnostics, and Recommended Spare Parts Manual · April 2014 Page 4-3
Diagnostics, Calibration, and Troubleshooting Diagnostics Procedure for Cold Weather Problems
Diagnostics Procedure for Cold Weather Problems
Figure 4-1 shows the flow chart of diagnostics procedure for cold weather problems for Atlas
9862 DEF units.
Figure 4-1: Flow Chart
STOP
Below
Operating
Temperature
Specs.
YES
NO
Wait Until Local
Temperature
Increases
and Warms
Test 9800
CPU
Board
PROBLEM 1
Hear Fan ON
Feel Heat in Lower Cabinet
Feel Heaters
YES
Verify
Solenoid
Valve is
Open
NO
NO
Coriolis
Interface
CR1 and
CR2 ON
YES
NO
Replace
Coriolis
Meter
M10006A003 Temperature Control Board
CR1 and CR2 is ON
Replace
Power
Supply
M04151B005
YES
Test Fuse on
Heater/Fan
Assembly
Replace
Heater and
Fan
Assembly if
Fuse is good
NO
YES
NO
YES YES
YES
YES
NO
NO
NO
NO NO
Verify
110 VAC
is on P3 AC
Input
Connector
Temperature
Control Board
Mearure for
+5 VDC
at TP1 and TP2
Temperature
Control Board
Mearure
+5 VDC
on P130 Pin 1
Measure
110 VAC
at P1301A at Pins
1 and 4
Replace
Temperature
Control
Board
Replace
Bottom
Temperature
Sensor
Verify
110 VAC
is Measured
at J-box
Check Power
Cable
Connection to
Temperature
Control
Board
Coriolis
Interface
Board
Measure
+5 VDC at
J1401 Pins
1 and 3
Check Circuit
Breaker is ON
9800 CPU Board
Measure +5 VDC at
P9 Pins 1 and 6
No or Low
Voltage
Measured
YES
Is
Outside
Temperature
Below - 30
DISPLAY
999
No Product
Frozen Condition: The coriolis interface board monitors the temperature at the
solenoid valve using the temperature sensor known as the frozen thermostat. The
purpose is to remove power to signal the 9800 CPU board not to active the solenoid
valve on the coriolis meter. This prevents the solenoid valve to potentially leak and
also prevent damage to the coriolis meter.
The CR5 LED on the coriolis interface board will light when a freeze condition
exists, which is normally caused by other component failure, causing the heaters
not to turn on as shown
Figure 4-1 .
Calibration Test: When the freeze problem has been
corrected and the heater/fans are working, to keep the inside
cabinet temperature in 30° F (-1.1° C) range or higher, you
need to recalibrate the unit to remove the error message 999
displayed.
Symptoms: In very cold weather conditions, the display shows 999 and is unable to dispense product.