Sensor And Control Voltage Fault Detection - Trane ACONT900AC43UA Service Manual

Graph 3
Graph 4
Graph 5
Low temp heating heat pump trip points
Control Boards
Graph 6 Low temp cooling A/C trip points

Sensor and Control Voltage Fault Detection

The Integrated Control Board has the capability to de-
tect and report a Liquid Pressure Sensor (see Figure
9) fault and a loss of control voltage at the Y1 connec-
tion on plug J1 (see figure 10).
A failed Liquid Pressure Sensor will display a ERR
113 at the Comfort Control and will initiate a 12 flash at
the Integrated Control Board Fault LED (see Figure 5).
If 24 volts is missing at the Y1 connection on plug J1,
the Comfort Control will display an ERR 18 and the
Integrated Control Board Fault LED will flash 18 times.
Figure 9
HP - B 5