Carrier High Wall Duct Free Split System 38MVC Service Manual page 43

A7 - - Fuse Chart
Unit Size
009
012
018
024
The 3.15A fuses protect the board against the indoor or outdoor fan motors.
The 2A fuses protect the board against a Class II circuit board failure.
A8 - - Indoor Unit Diagnostic Guides
Operation Timer
Lamp Lamp
X Indoor fan speed has been out of control for over 1 minute
l
On Indoor room temp. or evaporator sensor is open circuit or short circuited
l
X Compressor over--- current protection has been activated four times
l
On EPROM error*
l
Indoor unit communication error (Illuminates simultaneously)
l l
Opera-
Timer Defrosting
tion
Lamp Lamp
Lamp
l l l
X X
l
X X
l
X X
l
X X
l
X X
l
X X X
= Flashing
l
X = Off
* = Replace Indoor Board
Infrared signal receptor
OPERATION AUTO
ECON
Model size 009
* PRE- -DEF light will illuminate when the unit is running in FAN ONLY mode on Cooling Only units.
A9 - - Outdoor Unit Diagnostic Guides
Flashing
Times after 2
Second Off
5 Communication failure
2 Condenser temperature sensor failure
1 Other indoor failure
If the unit is operating normally, the LED light on the outdoor board is lit continuously. If there is a failure, the LED light will flash a specific
number of times. Refer to the Outdoor Unit Diagnostic table above to determine failure.
Indoor
---
---
3.15A/250V
3.15A/250V
9K & 12K Units
18K & 24K Units
Auto
Lamp
Over--- current protection of the compressor occurs four times
l
X Indoor room temp. sensor is open circuit or short circuited
X Temp. sensor on indoor evaporator is open circuit or short circuited
Temp. sensor on outdoor condenser is open circuit or short circuited (not
X
cooling only modes)
Outdoor unit protects (outdoor temp. sensor, phase order, etc.)
l
EPROM error*
l
Indoor unit communication error
l
TIMER OPERATION
TIMER
PRE-DEF
PRE-DEF
A07545a
Fig. 34 – LED Display Panel
Fuse Rating (Amps/Volts)
Outdoor
3.15A/250V
3.15A/250V
3.15A/250V
3.15A/250V
Failure Mode
Failure Mode
Infrared signal receptor
A07544
Model size 012
Failure Mode
43
Outdoor
2A/250V
2A/250V
---
---
Diagnostic
Chart
1
2
3
---
4
Diagnostic
Chart
3
2
2
2
5
---
6
OPERATION AUTO TIMER PRE.-DEF.
A07546a
Model size 018- - 024*
Diagnostic
Chart
4 or 6
2
–