Carrier 48FC Series Controls, Start-Up, Operation And Troubleshooting page 31

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 rest this fault.
Fault F319 – C.A1 DOWN DUE TO FAIL
This fault occurs when compressor A1 has 3 strikes. Investigate the
alerts that caused the strikes to occur, and correct or test as needed.
Manual alarm reset or power cycle is required to rest 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 automatically.
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 that 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 – RUN AWAY 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
degrees below the maximum SAT. The cause of this alert is usually
heat stuck on causing high SAT, or low air flow.
Alert A510 – INDOOR FAN STATUS
This alert occurs when a fan status switch is installed, the unit is
configured not to shut down on fan status, and the fan status switch
does not match the state of the fan. The cause of this is usually a
configuration error on the switch state in the software or the setting
on the actual switch itself.
Fault F511 – IDF OFF WHEN COMMAND ON
This fault occurs when the unit is configured to shut down on fan
status and the fan is requested greater than zero and the fan status
switch indicates the fan is off. The cause of this alert is usually a
configuration error on the switch state in the software or the setting
on the actual switch itself. Manual alarm reset or power cycle is
required to reset this fault.
Fault F512 – IDF ON WHEN COMMAND OFF
This fault occurs when the unit is configured to shut down on fan
status and the fan is requested off and the fan status switch
indicates the fan is off. The cause of this alert is usually a
configuration error on the switch state in the software or the setting
on the actual switch itself. Manual alarm reset or power cycle is
required to reset this fault.
Alert A700 – ECON NOT MODULATING
This alert occurs when the economizer feedback is enabled and the
actual speed does reach the commanded speed in the economizer
travel time configuration value. This alert will automatically reset
when the actual position does reach the commanded position. This
is usually caused by installation of the wrong actuator, no
economizer gear motion, or actuator direction control switch
(CCW, CW) wrong. Check damper blades, gears, and actuator.
This alert will usually be accompanied by another descriptive
informational alert.
Alert A701 – ECON STUCK CLOSED
See alert A700
Alert A702 – ECON STUCK OPEN
See alert A700
Alert A703 – IDF MECH DISCONNECTED
This alert occurs when the Alert A700 is not active yet the control
determines that the economizer changes are not aligning with the
temperature changes. This will require a manual reset to ensure the
economizer is inspected. This is usually caused by the actuator not
properly secured to the damper shaft.
Alert A710 – ECON NOT COOLING
See alert A700
Alert A711 – ECON IMPROPER COOLING
See alert A700
Alert A712 – EXCESSIVE OUTDOOR AIR
See alert A700
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