CA - A 17
Charge Assist™
Figure 40
Fault LED flash code of 7, Err code #79
This fault code only applies to the Heat Pump models
in the heating or cooling cycle. During the defrost
cycle, the LPCO switch is not checked by the Charge
Assist™ Control. The fault LED (Figure 36) will be
flashing in groups of seven flashes. This is an indica-
tion that the Low Pressure Cut-Out switch (LPCO) is
open. Check the suction pressure, it must be above
nine pounds.
Is the system suction pressure above nine pounds?
Yes: Check the voltage at the LPCO plug J4 (Fig-
ure 41A). If 24 volts AC is present at plug J4, un-
plug the LPCO and jumper the two pins of J4 to-
gether (Figure 41B). Turn off the 24 volts AC to the
Charge Assist™ Control and then re-power the con-
trol. The fault LED should go out and the outdoor
unit should come on when a call for heat or cooling
is placed at the Comfort Control. If the fault LED
continues to flash in groups of seven and the out-
door unit will not come on, replace the Charge As-
sist™ Control.
No: Repair Refrigerant System as needed.
Figure 41A
Figure 41B
Fault LED flash code of #10
This fault will only appear when the Charge Assist™
Control is being operated with a standard 24 volt AC
thermostat, non-communicating type, and thermostat
leads Y1 and Y2 are reversed.
Fault LED flash code of #11
The fault LED (Figure 20) will be flashing in groups of
11 flashes. This indicates that the Liquid Line Tem-
perature Sensor is reading out of range.
At the Charge Assist™ Control read the DC voltage at
the Liquid Temperature Sensor plug J8 with the sen-
sor plugged in or unplug the sensor and read the re-
sistance of the sensor (Figure 42).
Figure 42
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