Carrier 25VNA - Page 17

17
25VNA EVENT / FAULT (CONT.)
OPERATION
FLASH CODE
(Amber LED)
Heat or Cool
Mode
Po ssible Causes ACTION
System Malfunction 83
Cool
Cooling in Low Ambient region (55
° F and below) with ”Low Ambient
Cooling Control” disabled
Enable ”Low Ambient Cooling” via user
interface
Cool
Outside Normal Operating Range
(e.g.improperloadcalculation,sys-
tem match issue, outside cooling
range etc)
Consult Application Guidelines
Cool
Service Valve left closed (Liquid or
Vapor)
Ensure Service Valves are open
Cool
Undercharged System
Check system subcooling to determine
charge status, if low add charge using
Charging Mode (follow proper charging
procedures)
Indoor Airflow too l ow or of f
Check Indoor for clogging (ice or debris)
and clean or de---ice if n ecessary;
Troubleshoot Indoor fan motor and
make sure it is working; follow Indoor
Airflow troubleshooting instruction
RestrictioninFilterDrierplusLong
Line Application and filter drier on
Indoor Unit
Clean System (refer to application
guideline) and replace f ilter drier
Restriction due to debris
Clean System (refer to application
guideline) and replace f ilter drier
Restriction in Circuits or Tubing
Check kinks and straighten or replace
circuits
Both
RestrictioninFilterDrierplusfilter
drier on Outdoor Unit
Clean System (refer to application
guideline) and replace f ilter drier
Expansion Orifice Restriction
If short l ineset (less than 15 ft)
Troubleshoot TXV (see guide below); re-
place if necessary
Heat
Troubleshoot EXV (see guide below)
Outside Normal Operating Range
(e.g.improperloadcalculation,sys-
tem match issue, outside heating
range etc)
Consult Application Guidelines
Service Valve left closed (Liquid
Service Valve)
Ensure Liquid Service Valve is open
Outdoor Airflow too low or off
Check Outdoor for clogging (ice or
debris) and clean or de ---ice if neces-
sary; Troubleshoot Outdoor fan motor
and make sure it is working; follow Out-
door Airflow troubleshooting instruction
Undercharged System
Check charge in cooling (if in Cooling
Charge Mode Ambient Range), if low
add charge using Charging Mode (follow
proper charging procedures); if outside
coolingchargemoderange,pullout
charge, weigh in using heating charge
mode
Reversing Valve Bypass
Reversing Valve Stuck halfway;
troubleshoot reversing valve
Restriction due to debris
Clean System (refer to application
guideline) and replace f ilter drier