CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL
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21
84
System
Malfunction
HIGH PRESSURE
LOCKOUT FOR 4
HOURS
(Elevated from fault code
31 when the stage
(speed) can no longer be
lowered)
4 Hours
Cool
Outdoor Airflow too low
or off
Check Outdoor Coil for clogging (ice or debris) and
clean or de-ice if necessary; Troubleshoot Outdoor
fan motor and make sure it is working; follow
Outdoor Airflow troubleshooting
instruction
Cool
Overcharged System
Check system charge using Cooling Charging
Mode (follow proper charging procedures)
Cool
TXV malfunction (Indoor) causing an overcharged condition
Cool
Restriction in EXV
assembly plus Long
Line Application
leading to
Overcharge when
charging in Cooling
mode
Troubleshoot EXV
Cool
Restriction in Circuits
or Tubing
Repair restriction
Heat
Indoor Airflow too low
or off
Troubleshoot indoor fan motor and make sure it is
operating; follow indoor airflow
troubleshooting instruction. Check Indoor coil or
filter for restriction (debris) and clean if
necessary;
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
Overcharged System
Remove refrigerant, evacuate and recharge system
using weigh in method. Return to check charge to
sub-cooling when conditions are favorable in
cooling mode
Heat
Reversing Valve Stuck
in Cooling
troubleshoot reversing valve
Both
Service Valve left
closed (Liquid or
Vapor)
Ensure Service Valves are open
Both
Loose High Pressure
Switch harness leads
Check HPS harness, pins and connectors
Both
Pressure Switch
disconnected from the
inverter
Check HPS connection to the inverter
Both
Restriction of filter drier Check for temperature drop across filter drier and
replace if necessary
Both
Non-condensable
leading to high
pressure situation
Remove refrigerant, replace filter drier,
evacuate and recharge system
Both
Faulty Pressure Switch
Check Discharge pressure with gauge, if less than
600 +/- 20 psig and switch is open
(measure resistance) then replace pressure switch
Both
Expansion Device
Restriction
Troubleshoot TXV
Table 10 – Fault Code Actions (Continued)
Flash
Code
Type
AMBER LED
DESCRIPTION
Reset Time Mode
Possible Causes
Actions
