CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
19
77 Local
MAXIMUM POWER
MODE - COMP
CURRENT
(Temporary RPM
reduction or stage
lowering will result)
NA
Cool Overcharged System
Check system sub-cooling to determine charge
status, if high remove charge using Charging Mode
(follow proper charging
procedures)
Heat Overcharged System
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
Both
Compressor is
operating outside the
allowed operational
envelope
Inverter will reduce speed to a lower stage
Incorrect refrigerant
charge
Check refrigerant amount
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
Incoming power
supply voltage
Check voltage versus unit rating plate for
allowable range
Loose or incorrect wire
connections
Check incoming power leads and leads to the
compressor plug
79 Local
COMPRESSOR/
INVERTER FAULT
(Elevates to fault code
88 after 5 occurrences)
6 Minutes Both
Compressor fails to
start
System will try to self-mitigate with repeated start
attempts
Refer to fault code 88
82
System
Malfunction
SUCTION OVER TEMP
LOCKOUT
(Elevated from fault code
72 after 3 occurrences)
4 Hours
Cool
Undercharged
System
Check system subcooling to determine charge
status, if low add charge using Charging Mode
(follow proper charging procedures)
Cool Uninsulated vapor line Insulate the vapor line
Cool Indoor TXV operation Troubleshoot TXV
Heat
Undercharged
System
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
Outdoor EXV
operation
Troubleshoot EXV
Both
Reversing valve
bypass
Troubleshoot reversing valve
Table 10 – Fault Code Actions (Continued)
Flash
Code
Type
AMBER LED
DESCRIPTION
Reset Time Mode Possible Causes Actions
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