20
25VNA EVENT / FAULT (CONT.)
OPERATION
FLASH CODE
(Amber LED)
Heat or Cool
Mode
Po ssible Causes ACTION
System Malfunction 96 Both
Low supply line voltage (< 180 VAC)
Check supply voltage to ODU; if low con-
tact utility provider
Stormy weather causing intermittent
voltage dropouts
When adverse weather subsides u nit
should self ---recover; cycle ODU power if
necessary
Loosewireincontrolboxarea Loose wire: check for loose wire in ODU
Inverter internal damage Replace Inverter
System Malfunction 97 Both
High supply line voltage (> 257 VAC)
Check supply voltage to ODU; if high con-
tact utility provider
Stormy weather causing intermittent
voltage spikes
When adverse weather subsides u nit
should self ---recover; cycle ODU power if
necessary
Inverter internal damage Replace Inverter
Event 98 Both High Torque or Flank Loading Event
System will try to self ---mitigate, persistent
conditions will lead to lockout (refer to Er-
ror Code 99)
System Malfunction 99
Both
Outside Normal Operating Range (e.g.
improper load calculation, system
match issue, outside cooling range,
outside heating range etc)
Consult Application Guidelines
Restriction due to debris leading to
Overcharge when charging in Cooling
mode
Clean System (refer to application
guideline) and replace f ilter drier
Restriction in EXV plus Long Line Ap-
plication leading to Overcharge when
charging in Cooling mode
If long line, troubleshoot EXV
None condensibles leading to high
load
Clean System (refer to application
guideline) and replace f ilter drier
Cool
Service Valve left closed (Liquid or Va-
por)
Ensure Service Valves are open
Overcharged System
Check system charge using Cooling Char-
ging Mode (follow proper charging proced-
ures)
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
RestrictioninFilterDrierplusLong
Line Application and filter drier on Out-
door Unit
Clean System (refer to application
guideline) and replace f ilter drier
RestrictioninEXVplusOvercharge troubleshoot EXV
Restriction in Circuits or Tubing
Check kinks and straighten or replace cir-
cuits
Heat
Electric Heater plus Heat pump applic-
ation: Electric Heater stuck on
If User Interface is not requesting Electric
Heat check for heater relays, if on
troubleshoot Electric Heater
Furnace plus Heat pump application:
Furnace stuck on
If not in Defrost and Furnace is running
same time as heat pump, troubleshoot Fur-
nace
RestrictioninFilterDrierplusLong
Line Application and filter drier on In-
door Unit
Clean System (refer to application
guideline) and replace f ilter drier
Expansion Orifice Restriction Troubleshoot TXV (see guide below)
Troubleshoot EXV (see guide below)
Service Valve left closed (Vapor Ser-
vice Valve)
Ensure Vapor Service Valve is open
Indoor Airflow too l ow or of f
Check Indoor f or 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
troubleshooting instruction
Overcharged System
Check charge in cooling (if in Cooling
Charge Mode Ambient Range), if low add
charge using Charging Mode (follow prop-
er char ging procedures); if out side cool-
ing charge mode range, pull out charge,
weigh in using heating charge mode
Reversing Valve Stuck in Cooling troubleshoot reversing valve
Restriction due to debris
Clean System (refer to application
guideline) and replace f ilter drier
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