Carrier 48PG24, Controls, Start-Up, Operation, Service And Troubleshooting Instructions

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Table 43 — ComfortLink™ Alarm Codes (cont)
LEGEND
Restart Procedure —
Before attempting to restart the
machine, check the alarm list to determine the cause of the shut
down. If the shutdown alarm for a particular control function
has occurred, determine and correct the cause before allowing
the unit to run under its own control again. When there is prob-
lem, the unit should be diagnosed in Service Test mode. The
alarms must be reset before the control function can operate in
either Normal mode or Service Test mode.
Control Module Communication
RED LED — Proper operation of the MBB and ECB control
boards can be visually checked by looking at the red status
LEDs. When operating correctly, the red status LEDs should
blink in unison at a rate of once every 2 seconds. If the red LED
on the ECB is not blinking, check the DIP switch positions on
the board. If the red LEDs are not blinking in unison, verify that
correct power is being supplied to all modules. Also, be sure that
the board is supplied with the current software. If necessary, re-
load current software. A board LED that is lit continuously or
blinking at a rate of once per second or faster indicates that the
board should be replaced.
GREEN LED — The MBB and ECB each have one green
LED. The Local Equipment Network (LEN) LED should al-
ways be blinking whenever power is on. If LEN LED is not
blinking, check LEN connections for potential communication
errors (J3 and J4 connectors). Communication between
modules is accomplished by a 3-wire sensor bus. These 3 wires
run in parallel from module to module. The J4 connector on the
MBB also provides both power and communication directly to
the Scrolling Marquee display.
YELLOW LED — The MBB has one yellow LED which is
used to indicate CCN communication activity. The Carrier
Comfort Network® (CCN) LED will blink during times of
network communication.
Alarms and Alerts
VIEWING AND CLEARING UNIT ALARMS — Presence
of active alarms will be indicated on the Scrolling Marquee dis-
play by the Alarm Status light turning on and by the number of
active alarms being displayed in the automatic View of Run
Status. Presence of active alarms may also be signaled on the
Alarm Output terminals. Each alarm may also be broadcast on
the CCN network. Active alarms and past alarm history can be
reviewed and cleared via the local display or a CCN device.
The following menu locations are used for the local display:
Alarms
→
R.CURR (Reset All Current Alarms) — Change to
YES to reset all active alarms. Turning unit power off will also
reset all current alarms.
Alarms
→
R.HIST (Reset Alarm History) — Change to YES
to reset the alarm history. Turning unit power off will not reset
the alarm history.
Alarms
→
CURR (Currently Active Alarms) — Use the EN-
TER key, then scroll through any alarm numbers using the up
and down arrow keys. Alarms are displayed in numerical order.
Alarms
→
HIST (Alarm History) — Use the ENTER key,
then scroll through any alarm numbers using the up and down
arrow keys. Up to 20 alarms are displayed in order of occur-
rence, with time and date.
The description for an alarm can be viewed on the Scrolling
Marquee display by pressing ESCAPE and ENTER keys
simultaneously while displaying the alarm code number. Be
sure to expand description for each code, because in some
cases there are different possible descriptions and causes for
the same code number.
DIAGNOSTIC ALARM CODES AND POSSIBLE
CAUSES
Alert Codes T051, T052, T055 and T059 (Compressor
Safety) — Alert codes T051, T052, T055, and T059 are for
compressors A1, A2, B1, and C1, respectively. These alerts
occur when the Current Sensor (CS) does not detect compres-
sor current during compressor operation. When this occurs, the
control turns off the compressor and logs a strike for the respec-
tive circuit. These alerts reset automatically.
The possible causes are:
1. High-pressure switch (HPS) open. The HPS is wired in
series with compressor relays on the MBB. If the high-
pressure switch opens during compressor operation, the
compressor stops, and the CS no longer detects current,
causing the control to activate this alert.
2. Compressor internal protection is open.
3. Wiring error. A wiring error might not allow the compres-
sor to start.
To check out alerts T051, T052, T055, and T059:
1. Turn on the compressor in question using Service Test
mode. If the compressor does not start, then most likely
the problem is one of the following: HPS open, open
internal protection, incorrect safety wiring, or incorrect
compressor wiring.
2. If the compressor starts, verify that the indoor and out-
door fans are operating properly.
3. If the CS is always detecting current, then verify that the
compressor is on. If the compressor is on, check the con-
tactor and the relay on the MBB. If the compressor is off
ALARM OR
ALERT
NUMBER
DESCRIPTION
ACTION TAKEN
BY CONTROL
RESET
METHOD
PROBABLE CAUSE
T410
R-W1 Jumper Not Installed in Space Temp Mode Unable to run heat Automatic Missing jumper wire
R-W1 Jumper Must Be Installed to Run Heat In
Service Test
Unable to Test Heat Outputs Automatic Missing jumper wire.
T411
Thermostat Y2 Input Activated without Y1
Activated
Run unit as if Y2 and Y1 are On Automatic Bad Thermostat or Thermostat Wiring
T412
Thermostat W2 Input Activated without W1
Activated
Run unit as if W2 and W1 are On Automatic Bad Thermostat or Thermostat Wiring
T413
Thermostat Y and W Inputs Activated
Simultaneously
Run unit in mode activated first Automatic Bad Thermostat or Thermostat Wiring
T414
Economizer Damper Actuator Out of Calibration Alert Generated Automatic
Calibrate economizer (E.CAL). If problem still exist then determine what
is limiting economizer rotation.
Economizer Damper Actuator Torque Above Load
Limit
Alert Generated Automatic Actuator load too high. Check damper load.
Economizer Damper Actuator Hunting Excessively Alert Generated Automatic Damper position changing too quickly.
Economizer Damper Stuck or Jammed Alert Generated Automatic No economizer motion. Check damper blades, gears, and actuator.
Economizer Damper Actuator Mechanical Failure Alert Generated Automatic Check actuator and replace if necessary.
Economizer Damper Actuator Direction Switch
Wrong
Alert Generated Automatic Actuator direction control switch (CCW, CW) wrong.
T415 IAQ Input Out of Range No IAQ Operations Automatic Bad sensor, bad wiring, or sensor configured incorrectly.
T416 OAQ Input Out of Range No OAQ Operations Automatic Bad sensor, bad wiring, or sensor configured incorrectly.
ECB — Economizer Control Board MBB — Main Base Board
IGC — Integrated Gas Controller OAT — Outdoor-Air Thermistor