Troubleshooting; Upm Fault Code Table - Carrier GC Series Installation Instructions Manual

IMPORTANT: The following Troubleshooting tables are designed to help identify possible causes and solutions for problems. There
could be more than one cause/solution to a problem that can be applied. Check each cause and adopt "process of elimination"
and/or verification of each before making a conclusion.
Tables 14 and 15 show the status codes flashed by the amber status
light. The codes are flashed by a series of short and long flashes of
the status light. The short flashes indicate the first digit in the
status code followed by long flashes indicating the second digit of
OPERATION
Standby
Low Stage
High Stage
Brownout Protection is Disabled
Brownout Protection is Active
*Sequence: Compressor contactor is de ---energized. If demand still exists, control will energize compressor contactor after 15 minute delay. If fault is
cleared, unit will resume operation. If fault exists, blower shuts off, and error code continues to flash. Control will attempt re ---start every 15 minutes. Cycling

TROUBLESHOOTING

Table 14 – UPM Fault Code Table
FAULT
18 ---30 VAC power is present
System Communication Failure
Invalid Model Plug
High Pressure Switch
Low Pressure Switch
Internal Board Failure
Brownout on 230V
No 230V to unit
Freeze Sensor Fault
Compressor Thermal Cutout
in Low Stage
Compressor Thermal Cutout
in High Stage
Voltage at Standby
(contactor shorted)
No Voltage to Compressor
(No voltage at start---up)
Thermal Lockout in Low Stage
for 4 Hours
Thermal Lockout in High Stage
for 4 Hours
Low Pressure Lockout
High Pressure Lockout
Condensate Overflow
Freeze Sensor Lockout
low voltage defeats the 15 minute delay.
the error code. The short flash is 0.25 seconds on and the long
flash is 1.0 seconds on. Time between flashes is 0.25 seconds.
Time between short flash and first long flash is 1.0 seconds. Time
between code repeating is 2.5 seconds with LED off.
FLASH CODE POSSIBLE CAUSE AND ACTION
ON, no flash Normal Operation
1, pause Normal Operation
2, pause Normal Operation
5, pause User made selection, see instructions for details
6, pause Default, user can disable see instructions for details
Communication with User Interface lost. Check wiring
16
to and from User Interface
Control does not detect a model plug or detects an
25 invalid model plug. Unit will not operate without cor-
rect model plug.
High Pressure Switch Trip. Check Refrigerant
31* Charge, Water Flow and Temperature too high in
cooling, and airflow restrictions in heating.
Low Pressure Switch Trip. Check Refrigerant Charge,
32*
TXV operation and airflow restrictions.
UPM board has failed. Replace Board and transfer
45
model plug to replacement board.
Line voltage <170V for at least 4 seconds. Compres-
sor and blower not allowed until voltage >173V. Veri-
46
fy line voltage. This feature can be disabled, see in-
structions for details.
There is no 230V at the contactor when indoor unit is
powered and cooling/heating demand exists. Verify
47
the disconnect is closed and 230V wiring is connect-
ed to the unit.
Freeze sensor is invalid or out of range.. Check for
57 open sensor, wire disconnected, sensor not connect-
ed properly or abnormal sensor temp ranges.
Compressor operation detected then disappears
while low stage demand exist. Possible causes are
71*
internal compressor overload trip or start relay and
capacitor held in circuit too long (if installed).
Compressor operation detected then disappears
while high stage demand exist. Possible causes are
72*
internal compressor overload trip or start relay and
capacitor held in circuit too long (if installed).
Compressor voltage sensed when no demand for
73 compressor operation exists. Contactor may be
stuck closed or there is a wiring error.
Compressor voltage not sensed when compressor
74 should be starting. Contactor may be stuck open or
there may be a wiring error.
Thermal cutout occurs in 3 consecutive low/high
81 stage cycles. Low stage locked out for 4 hours or
until 24V power recycled.
Thermal cutout occurs in 3 consecutive high/low
82 stage cycles. High stage locked out for 4 hours or
until 24V power recycled.
Low Pressure Switch (LPS) trips 2 or 4 times in an
83 hour. Unit operation is locked out for 4 hours or until
24V power recycled.
High Pressure Switch (HPS) trips 2 or 4 times in an
84 hour. Unit operation is locked out for 4 hours or until
24V power recycled.
Water in the condensate pan exceeds certain level.
85 The compressor is re ---energized when water issue
clears.
Refrigerant temperature drops below or remains at
freeze limit trip for 30 seconds, the unit enters into a
permanent lockout and needs a manual reset. Water
coil freeze sensor below limit, verify proper loop wa-
86 ter temp and pressures. Verify sensor accuracy us-
ing tables in instructions and verifying it is properly
attached to coil. Verify antifreeze quantity if applica-
ble and the freeze protection limit dip switch settings
appropriate on the UPM board.
34