Chiller/Heater Troubleshooting
ARTC-SVX005A-EN 63
Phase Monitor Protection
If the chiller/heater 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.
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 master
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.
Table 14. Compressor fault code summary
Alert
Code
Alert
Condition
Lockout
Level
Lockout
Indication
Normal Run
Solid Green
Normal operation, no alarm status. N/A N/A
CODE 1
Yellow Flash 1
Long run time. Compressor is running for more than 18 hours at full load. (CODE
1 is disabled in heat pump mode.)
N/A N/A
CODE 2
Yellow Flash 2
Compressor pressure trip. Compressor runs for 12 seconds to 15 minutes followed
by a compressor trip condition lasting longer than 7 minutes.
4x consecutive, 10x
total
Red:
Flash 2
CODE 3
Yellow Flash 3
Pressure switch cycling. Compressor runs for 12 seconds to 15 minutes followed by
a compressor trip lasting 35 seconds to 7 minutes.
4x consecutive, 10
total
Red:
Flash 3
CODE 4
Yellow Flash 4
Locked rotor. Compressor trips within a compressor run time of 12 seconds and
does not start within 35 seconds.
10x consecutive
Red:
Flash 4
CODE 5
Yellow Flash 5
Compressor moderate run trip. Compressor runs for 15 minutes to 18 hours
followed by a compressor trip lasting longer than 7 minutes.
4x consecutive, 10x
total
Red:
Flash 5
CODE 6
Red Flash 6
Open start circuit. Module has detected Y or Y1, and current in the R winding of
the compressor and no current in the S winding of the compressor for 2 seconds.
1 occurrence
Red:
Flash 6
CODE 7
Red Flash 7
Open run circuit. Module has detected Y or Y1, and current in the S winding of the
compressor and no current in the R winding of the compressor for 2 seconds.
1 occurrence
Red:
Flash 7
CODE 8
Yellow Flash 8
Welded contactor. Module has detected line currents in R and S windings, and Y or
Y1 is at 0 Vac for 15 seconds.
N/A N/A
CODE 9
Yellow Flash 9
Low voltage. Module has detected a 24 Vac supply voltage below 17 Vac ±1 Vac for
2 seconds.
N/A N/A
CODE 10
Red Flash 10
Over current protection. PROT terminal has above a 2A input for more than 40
milliseconds.
1 occurrence
Red:
Flash 10
Table 15. Phase monitor LED diagnostic codes
LED Display 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.
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