Carrier 40MPHA - Error Diagnosis and Troubleshooting

ERROR DIAGNOSIS AND TROUBLESHOOTING WITHOUT ERROR CODE
UNIT DAMAGE HAZARD
Be sure to turn off unit before any maintenance to prevent
damage or injury.
WARNING
!
Table 11—Remote Maintenance
Remote
Maintenance
Electrical Circuit Refrigerant Circuit Others
Possible
causes of
trouble
Power
failure
The main
power
tripped
Loose
connections
Faulty
transformer
The
voltage
is too
high or
too low
The
remote
control is
powered
off
Broken
remote
control
Dirty
air filter
Dirty
condenser
fins
The setting temp
is higher/lower
than the room's
(cooling/heating)
The ambient
temp. is too
high/low when
the mode is
cooling/heating
Fan
mode
SILENCE
function is
activated
(optional
function)
Frosting
and
defrosting
frequently
Heavy
load
condition
Loose
hold
down
bolts
and/or
screws
Not air
tight
Air inlet or
outlet of
either
unit is
blocked
Interference from
cell phones towers
and remote
boosters
Shipping
plates
remained
attached
Unit will not
start
☆ ☆ ☆ ☆
Operation is
erratic,
unpredictable
or unit is
unresponsive
☆
Cannot set
desired
temp.
☆ ☆
Unit is on but
the wind is
not cold (hot)
☆ ☆ ☆
Unit runs, but
shortly stops
☆ ☆ ☆
The unit
starts up and
stops often
☆ ☆ ☆ ☆
Unit runs
continuously
however
insufficient
cooling
(heating)
☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆
Cool can not
change to
heat
Unit is noisy ☆ ☆
Unit emits
bad odor
☆
Tes t m eth o d/
remedy
Te s t
voltage
Close the
power
switch
Inspect
connections
- tighten
Change the
transformer
Te s t
voltage
Replace
the
battery of
the
remote
control
Replace
the
remote
control
Clean
or
replace
Clean
Adjust the
setting temp.
Turn the
AC later
Adjust
to cool
mode
Turn of f
SILENCE
function.
Turn the
AC later
Check
the
heat
load
Tighten
bolts or
screws
Close all
windows
and
doors
Remove the
obstacles
Reconnect the
power or press
ON/OFF button on
remote control to
restart
Remove
them