CA - A 18
Charge Assist™
Does the liquid line temperature and the DC voltage or
resistance read at the Liquid Temperature Sensor plug
J8 agree with the temperature, resistance and voltage
chart? (See Reference Materials)
Figure 43
Step 2
Read the liquid line pressure with a calibrated high
pressure gauge.
Does the liquid line pressure and the DC voltage read
at the Liquid Pressure Sensor plug J9 test point + VP
and the 24 volt AC terminal T5 agree with the pressure
shown on the liquid line pressure and voltage chart?
(See Reference Materials)
Fault LED flash code of 12
The fault LED (Figure 36) will be flashing in groups of
12 flashes. This indicates that the Liquid Pressure
Sensor is reading out of range.
Step 1
Read the DC voltage at the Liquid Line Pressure Sen-
sor plug J9 test point (+ VP) and the 24 volt common
terminal T5 with the sensor plugged in (Figure 44.)
Yes: Replace the Charge Assist™ Control.
No: If there is 4.9 volts DC between the black com-
mon wire and the red power wire at pressure plug
J9 (Figure 45A) and the pressure and voltage mea-
sured do not match the liquid line pressure and volt-
age chart replace the pressure transducer. If there
is no voltage between the black common wire and
the red power wire or the 4.9 volts DC is lower than
4.9 volts DC, unplug the transducer (Figure 45B)
and re-check the voltage at plug J9. If the voltage
at the pressure plug J9, with the pressure trans-
ducer unplugged, now reads 4.9 volts, replace the
transducer. If the voltage at the pressure plugs re-
mains low when the transducer is unplugged, re-
place the Charge Assist™ Control.
Yes: Unplug and re-plug the Liquid Line Tempera-
ture Sensor (Figure 43) several times to insure it is
making good contact with the control pins. Turn off
the 24 volts AC to the Charge Assist™ Control and
then re-power the control. If the 11 flash codes con-
tinue to be displayed, replace the Charge Assist™
Control.
No: Unplug and re-plug the Liquid Line Temperature
Sensor (Figure 43) several times to insure that it is
making good contact with the Charge Assist™ Con-
trol plug; then re-check the DC voltage or resistance.
If the DC voltage and temperature or resistance still
does not agree with the Liquid Line temperature,
resistance and voltage chart, replace the Liquid Line
Temperature Sensor.
Figure 44
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