CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL
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18
74
System
Malfunction
DISCHARGE TEMP
OUT OF RANGE
LOCKOUT
(Elevated from fault code
59 after 5
occurrences)
2 Hours
Cool
High Load conditions
Over charge: Check system charge
Heat
Low Charge or Loss of
Charge at low
ambient heating
conditions
Check charge in heating mode per heating check
charge chart. If pressures do not match then pull
out charge, weigh in using heating charge method
Heat
Expansion Device
Restriction
Heating: Trouble shoot EXV (coil, harnesses);
Trouble shoot the TXV
Power Cycle system, is EXV moving on power up
(audible)
Both
Sensor Harness not
connected to AOC
control
Ensure plug is connected to AOC control
Broken or loose
harness wire
Check harness for continuity; see resistance chart
to check resistance at given temperature
Broken or Damaged
Sensor
Check harness for continuity; see resistance chart
to check resistance at given temperature
Indoor Unit Airflow too
low or off
Troubleshoot indoor fan motor and make sure it is
working
Outdoor Unit Airflow
too low or off
Troubleshoot outdoor fan motor and make sure it is
working
Reversing Valve
Bypass or Reversing
Valve not energized
Reversing Valve stuck halfway
Ensure AOC fuse is good
24 VDC in cooling mode
Check harness and connectors
Both
Hardware damage to
AOC control
Replace AOC control
Both
Nuisance fault during
non-operational mode Refer to TIC 2015-0017 for more details
75
Local
MAXIMUM POWER
MODE - TEMP
(Temporary RPM
reduction or stage
lowering will result)
NA
Heat
Indoor Airflow too low
or off
Check indoor airflow
Both
Outdoor Airflow too low
or off
Check ODU coil for clogging (ice or debris) and
clean if necessary; Troubleshoot ODU fan motor
and make sure it is working
Blocked Inverter Heat
Exchanger (fins)
Check Inverter fins for debris and clean if
necessary
Application violates
guideline
Consult Application Guideline for compliance
76
System
Malfunction
FAN INVERTER
LOCKOUT
(Elevated from fault code
61 after 5
occurrences)
2 Hours
Both
Fan blade bent/out of
balance
Check outdoor fan blade
Check for ice build up
Fan blade restricted
Check outdoor fan blade clearance
Check for ice build up
Fan motor wiring
Check outdoor fan motor connectors and
harness
Fan motor
Replace outdoor fan motor
Inverter damage
Replace inverter
Table 10 – Fault Code Actions (Continued)
Flash
Code
Type
AMBER LED
DESCRIPTION
Reset Time Mode
Possible Causes
Actions
