Carrier 25VNA Service Manual page 19

FLASH CODE
OPERATION
(Amber LED)
System Malfunction 85
System Malfunction 86
System Malfunction 88
Event 91
Event 92
Event 93
Event 94
System Malfunction 95
25VNA EVENT / FAULT (CONT.)
Heat or Cool
Possible Causes
Mode
Multiple Error 59 --- "Compressor
Scroll Temp Out of Range" within two
hours of run time
Both
Multiple Error 71 --- "Compressor Mo-
tor Temp Out of Range" within two
hours of run time
Sensor Harness not connected to In-
verter Drive control
Sensor plug not properly sited or not
attached to compressor
Broken or loose harness wire
Both
Failed Open/Close Compressor Intern-
al Thermistor
Blocked Inverter Heat Exchanger (fins)
Both Outdoor Airflow too low or off
Outdoor Unit airflow blocked (improp-
er installation)
Outside Normal Operating Range (e.g.
Cool outside cooling ambient temperature
range etc)
Outside Normal Operating Range (e.g.
Heat outside heating ambient temperature
range etc)
Both Inverter internal damage
High DC Voltage spikes in DC voltage
Both
measured by the Inverter drive
Low DC Voltage dropouts in DC
Both
voltage measured by the Inverter drive
Low AC Voltage dropouts in AC
Both
voltage measured by the Inverter drive
High AC Voltage spikes in AC voltage
Both
measured by the Inverter drive
High supply line voltage (> 257 VAC)
Stormy weather causing intermittent
voltage spikes
Loose wire in control box area
Ground lead from Compressor at-
Both
tached to winding power connection
Compressor Winding damage
Inverter internal damage
19
ACTION
System will try to ride through current
spikes and self ---recover in trip condition;
persistent Error 59 --- "Compressor Scroll
Temp Out of Range" trips will lead to Error
88; (Refer to Error 59 troubleshooting)
System will try to ride through current
spikes and self ---recover in trip condition;
persistent Error 71 --- "Compressor Motor
Temp Out of Range" trips will lead to Error
88; (Refer to Error 71 troubleshooting)
Ensure plug is connected to Inverter Drive
control
Reattach sensor plug to compressor
Check harness for continuity; on the
sensor fusite resistance should be in 10
kOhm between scroll and common termin-
als and 5 kOhm between motor and com-
mon terminals at 70 +/ --- 20 F. See com-
pressor troubleshooting guidelines
Check harness for continuity; on the
sensor fusite resistance should be in 10
kOhm between scroll and common termin-
als and 5 kOhm between motor and com-
mon terminals at 70 +/ --- 20 F. See com-
pressor troubleshooting guidelines
Check Inverter fins for debris and clean if
necessary
Check Evaporator (IDU in cooling, ODU in
heating) for clogging (ice or debris) and
clean if necessary; Troubleshoot Evaporat-
or fan motor and make sure it is working
Consult Application Guidelines
Consult Application Guidelines
Consult Application Guidelines
Replace Inverter
System will try to ride through voltage
spikes and self ---recover in trip condition;
persistent over current trips will lead to Er-
ror 97 "High Voltage Lockout" (Refer to Er-
ror 97 troubleshooting)
System will try to ride through voltage dro-
pouts and self ---recover in trip condition;
persistent over current trips will lead to Er-
ror 96 "Low Voltage Lockout" (Refer to Er-
ror 96 troubleshooting)
System will try to ride through voltage dro-
pouts and self ---recover in trip condition;
persistent over current trips will lead to Er-
ror 96 "Low Voltage Lockout" (Refer to Er-
ror 96 troubleshooting)
System will try to ride through voltage
spikes and self ---recover in trip condition;
persistent over current trips will lead to Er-
ror 97 "High Voltage Lockout" (Refer to Er-
ror 97 troubleshooting)
Check supply voltage to Outdoor Unit; if
high contact utility provider
When adverse weather subsides unit
should self ---recover; cycle ODU power if
necessary
Check for loose wire in ODU
Ensure compressor ground and other
leads are correctly installed
Troubleshoot compressor windings. For
the 2 and 3T the resistance should be .681
ohm and for 4 and 5T the resistance
should be .203 ohm at 70F +/ ---20F. See
compressor troubleshooting guidelines. If
confirmed replace compressor
Replace Inverter