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Chiller/Heat Pump Troubleshooting
Table 22. CoreSense™ communications LED flash code information (continued)
Status
Fault Condition
Red Flash Code
Future Use
5
Red Flash Code
Missing Phase
6
Red Flash Code
Reverse Phase
7
Red Flash Code
Future Use
8
Module Low
Red Flash Code
Voltage
9
Phase Monitor Protection
If the chiller/heat pump fails to power up, eliminate
electrical phase issues by inspecting the phase monitor
device located in the power distribution panel.
When all voltages are acceptable and the phase sequence
is correct the output relay is energized and the LED glows
green. Under-voltages and unbalanced voltages must be
sensed for a continuous trip delay period before the relay
de-energizes. Reset is automatic upon correction of the
fault condition. The output relay will not energize if a fault
condition is sensed as power is applied. The LED flashes
red during the trip delay, then glows red when the output
de-energizes. The LED flashes green/red if phase reversal
is sensed.
Table 23. LED phase monitor diagnostic codes
LED Display
76
Code Fault
Description
N/A
Missing phase
Reverse phase; Lockout
Interrupt power to T2-T1 or perform
after 1 Alert
N/A
Low voltage on T2-T1
terminals1
Indication
Glowing green: All voltages are
acceptable and phase sequence is
correct.
Flashing red: Trip delay prior to
de-energizing. Glowing red:
Output has been de-energized
upon fault detection.
Flashing red and green: Phase
reversal is detected.
No power to phase monitor.
Code Reset Description
N/A
After 5 minutes, missing phase
condition is not present
Modbus reset command
N/A
After 5 minutes, the voltage is back
in the normal range
If the phase monitor fails to energize (the LED glows red)
check wiring of all three phases, voltage, and phase
sequence. If phase sequence is incorrect, the LED flashes
green/red. To correct this, swap any two line voltage
connections at the mounting socket. No further adjustment
should be required.
Symptoms and Solutions
This section lists the most common troubleshooting
symptoms and the closest potential solution for each. This
is not an exhaustive listing of all potential causes or
resolutions, but represents the best direction in which to
initiate a solution.
Note: An anti-short cycle timer is included in the primary
microprocessor controller to prevent the
compressors from starting until the delay has
elapsed. The microprocessor also provides
minimum compressor run timers. Take these fixed
timer parameters into consideration when
conducting a fault isolation process.
Trouble Shooting Information
N/A
1.
Check incoming power.
2.
Check fuses/breakers.
3.
Check contactor.
1.
Check incoming phase sequence.
2.
Check contactor.
3.
Check module phasing wires A-B-C.
N/A
1.
Verify correct module p/n.
2.
Check VA rating of transformer.
3.
Check for blown fuse in transformer
secondary.
ARTC-SVX010A-EN
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