PTAC-SVX004A-EN
33
Troubleshooting and Resources
Troubleshooting Error Codes and Malfunctions
Table 8. Digital Display Error Codes
Control
Board
Display
Status LED -
Number of
Flashes
Followed by 3
second delay
Code Description Explanation Troubleshooting
F0 Green Light On
Constant (Normal
Operation)
Refrigerant loss or
sensor issue
Indoor ambient sensor or indoor
tube sensor failure or
disconnected. (yellow/white wire
black plug) or (white plug, black
wire).
1. Inspect the unit, specifically the
refrigerant system for leaks or visible
damage.
2. Observe the refrigerant circuit
temperatures.
3. On the condenser coil there is a “tube
temperature sensor”. It is inserted
into a sleeve that is brazed to coil.
Verify that the tube temperature
sensor is inserted snuggly into the
sleeve. If it is not, insert into the
sleeve.
4. Inspect the ambient temperature
sensor located in front of the
evaporator coil. Ensure that the
sensor is secure in the plastic holders
and that it is not touching the
evaporator coil.
5. Inspect the board located inside the
compartment that is located below the
on board mounted controls. Verify
that the inner tube temp. and the
outer tube temp. Sensors are plugged
into the board correctly and not
reversed. (If they are reversed, it can
cause the code to appear.)
F1 1 Flash Indoor ambient
temperature sensor
open or short circuited
Indoor ambient sensor (RT2) at
77 degrees F = 15K ohms
(yellow/white wire black plug).
1. Check the sensor wiring and
connections to the main board.
2. Test the resistance of the sensor while
disconnected.
3. Replace the main board if needed.
F2 2 Flashes Indoor coil tube
temperature sensor
open or short circuited
Indoor Coil Tube sensor (RT1) at
77 degrees F = 20K ohms (black
plug, black wire).
1. Check the sensor wiring and
connections to the main board.
2. Test the resistance of the sensor while
disconnected.
3. Replace the main board if needed.
F4 4 Flashes Outdoor coil tube
temperature sensor
open or short circuited
Outdoor Tube sensor (RT3) at 77
degrees F = 20K ohms (white
plug, black wire).
1. Check the sensor wiring and
connections to the main board.
2. Test the resistance of the sensor while
disconnected.
3. Replace the main board if needed.
FJ
(a)
Green Light On
Constant (Normal
Operation)
Outlet air temperature
sensor failure
Outlet air temperature sensor
(DAHT) at 77 degrees = 20K
ohms (red plug, black wire).
1. Check the sensor wiring and
connections to the main board.
2. Test the resistance of the sensor while
disconnected.
3. Replace the main board if needed.
FP
(a)
Green Light On
Constant (Normal
Operation)
Low temperature
prevention protection
Indoor ambient temperature
below 40 degrees F
1. Check the sensor wiring and
connections to the main board.
2. Test the resistance of the sensor while
disconnected.
3. Replace the main board if needed.
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