25Vna Event / Fault - Carrier 25VNA Service Manual

FLASH CODE
OPERATION
(Amber LED)
Standby/Charging
Variable Capacity
1 (1 sec ON),
Variable Capacity (Range
longer pause (2
Cutback)
second OFF)
Emergency Mode Continuous Flash
Event
Event
Event
Event
System Malfunction
Event
System Malfunction
Table 6—25VNA EVENT / FAULT
Heat or Cool
Mode
ON, no flash --- --- ---
1, pause --- --- ---
Both
Heat
Both
16 Both
25 Both
31 Both
32 Both
45 Both
46 Both
48 Both
Possible Causes
--- --- ---
--- --- ---
Pressure Trip Cutback: 2 or more
High Pressure Trips occurred in
past 2 hours
High Load Cut back: 2 or more
Torque Limit Trips occurred in the
past 2 hours
Flank Loading Cutback: Flank Load
is too high, ODU raising speed
(shrinking capacity range) to im-
prove reliability
Oil Circulation cutback: Suction
Pressure too high for current com-
pressor speed; ODU reducing
speed to improve oil circulation
Regular T ---Stat used in Emergency
mode: Nominal Capacity only (fixed
speed operation)
Loose wire or shorted leads
Wrong Model Plug Installed
Damaged Model Plug
Data Bus locked up by power loss,
brownout or glitch
Damaged ODU control
Wrong Model Plug Installed
Damaged Model Plug
Damaged ODU control
High Pressure Event
Low Pressure Event
Damaged ODU control
low line voltages
Loose or disconnected harness (CC
@ HP control, CC @ contactor, IN-
VERTER @ HP control, INVERTER
@ inverter drive)
Loose wire or shorted leads
Contactor not pulled in
Damaged Contactor Coil
Damaged ODU Control
Possible damage to Inverter Drive
13
ACTION
--- --- ---
--- --- ---
System will self ---mitigate, persistent con-
ditions will lead to lockout (refer to Error
Code 84)
System will try to self ---mitigate, persist-
ent conditions will lead to lockout (refer
to Error Code 99)
System will try to self ---mitigate, persist-
ent conditions will lead to lockout (refer
to Error Code 99)
check for Indoor airflow restrictions
install Infinity User Interface
Verify communications wiring (ABCD);
check for loose connection, stripped
wires, short to ground or short between
wires
Verify correct model plug installed
Check model plug for corrosion or
breakage; replace if necessary
Cycle Power to system
Replace ODU control
Verify correct model plug installed
Check model plug for corrosion or
breakage; replace if necessary
Replace ODU control
System will self ---mitigate, persistent con-
ditions will lead to lockout (refer to Error
Code 84)
System will self ---mitigate, persistent con-
ditions will lead to lockout (refer to Error
Code 83)
Replace ODU control
if persistent contact power provider
Verify good harness connection
Verify communications wiring ("Inverter"
harness); check for loose connection,
stripped wires, short to ground or short
between wires; confirm good connection
is made at control board and at Inverter
Verify contactor harness from ODU con-
trol ("CC" harness); check for loose con-
nection, stripped wires, short to ground
or short between wires; confirm good
connection is made at control board and
at contactor
if wiring is ok measure across the con-
tactor coil for 18VAC --- 32VAC; if voltage
is present measure across contactor ter-
minals 21 & 23 for line voltage if absent
then contactor is damaged
confirm ~ 5VDC on pins 3 & 4 of "Invert-
er" pin out connection on ODU control if
absent board is damaged
Change out ODU control before Inverter
Drive; if this does not help then change
out the Inverter drive