Carrier 48LC Series Controls, Start-Up, Operation And Troubleshooting page 36

period, the coils will thaw and the strike should clear and re-
start if there is nothing else wrong with the circuit. The alert re-
sets automatically. The cause of the alert is usually low refrig-
erant charge, dirty filters, evaporator fan operating backwards,
loose or broken belt, plugged filter drier, faulty transducer, ex-
cessively cold return air, or stuck open economizer when the
ambient temperature is low.
Alert A317 – CIR.A PRESSURE RATIO
This alert occurs when the Circuit A pressure ratio is less than
the configured MIN PRESSURE RATIO amount. This alert
resets automatically. The control will add a strike for whichev-
er compressors were on. The cause of the alert is usually an un-
dercharged system, low outdoor ambient temperature coupled
with dirty outdoor coil, plugged filter drier, or ODF speeds be-
ing set too high.
Fault F318 – COMPRESSOR STUCK ON
This alert occurs when the suction pressure does not raise the
minimum suction amount (CIR.A MIN SUC.P) and the ratio
did not fall at least the off pressure ratio (OFF P.RATIO).
When this occurs, the control turns off all of the compressors,
and enters a safety shutdown condition. The possible causes
are a welded contactor or frozen compressor relay on MBB.
Manual alarm reset or power cycle is required to reset this
fault.
Fault F319 – C.A1 DOWN DUE TOFAIL
This fault occurs when compressor A1 has 3 strikes. Investi-
gate the alerts that caused the strikes to occur, and correct or
test as needed. Manual alarm reset or power cycle is required
to reset this fault.
Alert A320 – C.A1 REVERSE ROTATION
This alert occurs when 10 seconds after the compressor turns
on, the suction rose and the discharge pressure dropped. This
alert causes a strike for the compressor. The alert resets auto-
matically. The cause of the alert is usually compressor wiring
causing reverse rotation or a faulty compressor.
Alert A321 – C.A1 FAIL TO PRESSURE
This alert occurs when 10 seconds after the compressor turns
on, the suction did not drop more than suction amount (CIR.A
MIN SUC.P) and discharge pressure did not rise more than
discharge amount (CIR.A MIN DIS.P). This alert causes a
strike for the compressor. The alert resets automatically. The
cause of the alert is usually compressor wiring causing reverse
rotation or a faulty compressor.
Fault F322 – C.A2 DOWN DUE TO FAIL
This fault occurs when compressor A2 has 3 strikes. Investi-
gate the alerts that caused the strikes to occur, and correct or
test as needed. Manual alarm reset or power cycle is required
to reset this fault.
Alert A323 – C.A2 REVERSE ROTATION
This alert occurs when 10 seconds after the compressor turns
on, the suction rose and the discharge pressure dropped. This
alert causes a strike for the compressor. The alert resets auto-
matically. The cause of the alert is usually compressor wiring
causing reverse rotation or a faulty compressor.
Alert A324 – C.A2 FAIL TO PRESSURE
This alert occurs when 10 seconds after the compressor turns
on, the suction did not drop more than suction amount (CIR.A
MIN SUC.P) and discharge pressure did not rise more than
discharge amount (CIR.A MIN DIS.P). This alert causes a
strike for the compressor. The alert resets automatically. The
cause of the alert is usually compressor wiring causing reverse
rotation or a faulty compressor.
Alert A410 – IGC IGNITION FAILURE
This alert occurs when the IGC fan request does not activate
15 minutes after turning heat 1 on when configured for Gas
Heat. The control will lockout all the heat stages. This alert
will automatically reset after the IGC fan request occurs. The
cause of this alert is usually faulty wiring of the IGC, no gas
flow, or wrong configuration.
Fault F411 – ROLLOUT WITHOUT HEAT
This fault occurs when the IGC fan request activates and the
heat has been off for at least 3 minutes when configured for
Gas Heat. The control will enter the safety shutdown condition.
This alert will automatically reset after the IGC fan request
turns off for 10 minutes. The cause of this alert is usually faulty
wiring of the IGC, or rollout switch trip without a heat call.
Fault F412 – RUNAWAY HEAT
This fault occurs when the SAT rises above the maximum SAT.
The control will enter the safety shutdown condition. This alert
will automatically reset after if configured to and the SAT falls
50°F below the maximum SAT. The cause of this alert is usual-
ly heat stuck on causing high SAT, or low air flow.
Alert A510 – INDOOR FAN STATUS
This alert occurs when the unit is configured not to shut down
on fan status and either the fan is requested off and the fan
speed feedback does not reach zero in the VFD deceleration
time or the fan is requested greater than zero and the fan speed
feedback does not reach that speed in the VFD acceleration
time. This alert will reset automatically. The cause of this alert
is usually broken belt, motor failure, or configuration error.
Fault F511 – IDF OFF WHEN COMMAND ON
This fault occurs when the unit is configured to shut down on
fan status, the fan is requested greater than zero, and the fan
speed feedback does not reach that speed in the VFD accelera-
tion time. The cause of this alert is usually Fan stuck on, or
Configuration incorrect. Manual alarm reset or power cycle is
required to rest this fault.
Fault F512 – IDF ON WHEN COMMAND OFF
This fault occurs when the unit is configured to shut down on
fan status, the fan is requested off, and the fan speed feedback
does not reach zero in the VFD deceleration time. The cause of
this alert is usually tripped circuit breaker, broken belt, bad in-
door fan motor, or configuration incorrect. Manual alarm reset
or power cycle is required to rest this fault.
Fault F600 – IDF VFD COMMUNICATION
This fault occurs when the indoor fan VFD and the System-
Vu™ control are not communicating properly. This will cause
a unit shutdown, and will automatically reset when communi-
cation is properly restored. The cause of this is usually a break
in the communication connection, noise on the LEN bus, wir-
ing error, or a configuration error. Verify VFD configurations
are set per the latest literature.
Fault F601 – IDF VFD UNEXPECTED
This fault occurs when the indoor fan VFD informs the System-
Vu control that it has an active fault. This will cause a unit shut-
down, and will automatically reset when the VFD fault is cleared
but likely will require a manual reset to reset the VFD. Refer to
the VFD section or literature for details on the specific VFD
fault. Verify VFD configurations are set per the latest literature.
Fault F602 – IDF VFD LOCKOUT
This fault occurs when the indoor fan VFD informs the Sys-
temVu control that it has an active lockout fault. This will
cause a unit shutdown, and requires a power cycle to reset the
VFD. Refer to the VFD section or literature for details on the
specific VFD fault. Verify VFD configurations are set per the
latest literature.
Alert A603 – IDF VFD IN HAND
This alert occurs when the indoor fan VFD informs the Sys-
temVu control that it is no longer in auto control and in either
hand or off mode. This can only be done with the accessory
VFD keypad. This will automatically reset when the VFD is
placed back into auto mode for the VFD keypad. Refer to the
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