Orion System HB Controller - Manual (Page 36)

Zone
Zone
Troubleshooting
36
HB Controller Technical Guide
Using LEDs To Verify Operation
The HB controller is equipped with LEDs that can be used as very
powerful troubleshooting tools. The HB controller circuit board has
three differently colored LEDs. See Figure 11 for the various LED
locations. The Red LED is used to indicate fault conditions. The Yel-
low LED indicates the mode of operation the HB controller is currently
operating in. The Green LED indicates the power and communications
status of the HB controller.
LD3
LD2
LD1
GND
SAT
POS
GND
RAB
TB2
RESET
ECONO
MHGRV
TB1
LD1 - Red LED
HB Controller Board
LD2 - Yellow LED
LD3 - Green LED
Figure 10: HB Board LED Locations
One LED blink is defi ned as a 1-second LED ON period immediately
followed by a 1-second LED OFF period. After each series of blinks is
completed, the LED will power off for 3 seconds and then repeat the
series of blinks. The various blink codes and their meanings are defi ned
in the tables that follow.
Red LED
LED
Blinks Fault Condition Description
1 Heat Safety Lockout
2 High Pressure Fault
3 Low Pressure Lockout
4 Bad Supply Air Temperature Sensor
5 Bad Outdoor Air Temperature Sensor
6 Bad Liquid Line Temperature Sensor
7 Clogged Filter Switch
Notes:
1. When no fault exists, the red LED will be off.
2. Heat Safety Lockout (1 blink) is the highest priority. Clogged
Filter Switch (7 blinks) is the lowest priority.
Table 2: Red LED Blink Codes
HB Controller Fault Condition Operation
If the Red LED indicates a Bad Outdoor Air Temperature Sensor, Heating
Mode will operate, but Cooling Mode will be disabled until the sensor
problem is fi xed.
If the Red LED indicates a Bad Supply Air Temperature Sensor, Heating
and Cooling Modes will continue to operate, but all Reheat functions
will be disabled during Dehumidifi cation and Economizer Modes.
If the Red LED indicates a Bad Liquid Line Temperature Sensor, the
Condenser Fan will run continuously any time the Cooling Relays are
energized.
Yellow LED
LED
Blinks Mode Indication Description
1 Vent Mode (Fan Only)
2 Heating Mode
3 Cooling Mode
4 Economizer Mode
5 Dehumidifi cation Mode
6 Economizer Dehumidifi cation Mode
Table 3: Yellow LED Blink Codes
Green LED
LED
Blinks Power/Communications Description
1 Power Indicator (No Communications)
2 HSS Communications
3 MHGRV Communications
4 MHGRV/HSS Communications
Table 4: Green LED Blink Codes
Troubleshooting