23
Flash Code Ty p e Amber LED Description
Reset
Time
Mode Possible Causes Actions
84
System
Malfunction
HIGH PRESSURE LOCK-
OUT FOR 4 HOURS
(Elevated from fault code
31 when the stage (speed)
can no longer be lowered)
4Hours
Both
Outside Normal Op-
erating Range (e.g.
improper load cal-
culation, system
match issue, outside
cooling range, out-
side heating range
etc.)
Consult Application Guidelines
Both
Service Valve left
closed (Liquid or
Vapor)
Ensure Service Valves are open
Both
Loose High Pres-
sure Switch harness
leads
Check HPS ha r ness
Both
Pressure Switch dis-
connected from
ODU Control Board
Check HPS connection on ODU control
Cool
Outdoor Airflow too
low or off
Check Outdoor Coil for clogging (ice or
debris) and clean or de ---ice if necessary;
Tr oubleshoot Outdoor fan motor a nd
make sure it is working; follow Outdoor
Airflow troubleshooting instruction
Cool
Overcharged Sys-
tem
Check system charge using Cooling
Charging Mode (follow proper charging
procedures)
Heat
Indoor Airflow too
low or off
Check Indoor for clogging (ice or debris)
and clean or de---ice if n ecessary; Trou-
bleshoot Indoor fan motor and make sure
it is working; follow Indoor Airflow trou-
bleshooting instruction
Both
Restriction due to
debris leading to
Overcharge when
charging
Clean System (refer to application guide-
line) and replace filter drier
Both
RestrictioninEXV
plus Long Line Ap-
plication leading to
Overcharge when
charging in Cooling
mode
If long line, troubleshoot EXV
Both
N o n --- c o n d e n s a b l e
leading to high load
Clean System (refer to application guide-
line) and replace filter drier
Cool
RestrictioninFilter
Drier plus Long Line
Application and filter
drier on Outdoor
Unit
Clean System (refer to application guide-
line) and replace filter drier
Cool
RestrictioninEXV
plus Overcharge
troubleshoot E XV
Cool
RestrictioninCir-
cuits or Tubing
Check kinks and straighten or replace cir-
cuits
Both
Faulty Pressure
Switch
Check Discharge pressure with gauge, if
less than 610 +/--- 20 psig and switch is
open (measure resistance) then replace
pressure switch
Heat
Electric Heater plus
Heat pump applica-
tion: Electric Heater
stuck on
If User Interface is not requesting Electric
Heat check for h eater relays, if on trou-
bleshoot El ectric Heater
Heat
Furnace plus Heat
pump application:
Furnace stuck on
If not in Defrost and Furnace is running
same time as heat pump, troubleshoot
Furnace
Heat
RestrictioninFilter
Drier plus Long Line
Application and filter
drier on Indoor Unit
Clean System (refer to application guide-
line) and replace filter drier
Both
Expansion Device
Restriction
Troubleshoot TXV
Troubleshoot EXV
Heat
Overcharged Sys-
tem
Check charge in cooling (if in Cooling
Charge Mode Ambient Range), if low add
charge using Charging Mode (follow
proper charging procedures); if out side
cooling charge mode range, pull out
charge, weigh in using heating charge
mode
Heat
Reversing Valve
Stuck in Cooling
troubleshoot r ever sing val ve
85
System
Malfunction
FAN INVERTER TEMP
LOCKOUT
(Elevated from fault code
62 after 3 occurrences)
15 min-
utes
Both
Unusual loading of
the fan
Tr oubleshoot outdoor fan motor & blade
and make sure they are working
Check for fan outlet blockage due to
snow/ice etc.
Improper airflow
across inverter heat
sink
Inspect outdoor coil for obstructions
Both Inverter damage Replace inverter
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