68
SERVICING
Air conditioner/heat pump
fails to operate.
Integrated control module
diagnostic/status LED
display shows the indicated
code.
displays error message.
d
3
Mis-match
d3
Shared data sent
to integrated
control module
does not match
hardware
Verify
system type
(communicating
or legacy).
Verify shared
data is correct
model; re-
populate data if
required.
Wire system as
legacy system.
Turn power OFF prior
to repair.
Use memory card for
Insert memory card
BEFORE turning power
be removed after data
is loaded. Turn power
OFF before removing
memory card.
Error code will
be cleared once
data is loaded.
Applies only to fully
communicating system
thermostat.
Air conditioner/heat pump
fails to operate.
Integrated control
module diagnostic/status
LED display shows the
indicated code.
displays error message.
d
4
Invalid
Memory
Card Data
MC DATA
d4
Shared data on
memory card has
been rejected.
Verify
system type
(communicating
or legacy).
Verify shared
data is correct
model; re-
populate data if
required.
Wire system as
legacy system.
Turn power OFF prior
to repair.
Use memory card for
Insert memory card
BEFORE turning power
be removed after data
is loaded. Turn power
OFF before removing
memory card.
Error code will be
cleared once data is
loaded.
Very long run time.
Four consecutive
compressor protector
trips with average run
time between trips greater
than 3 hours.
Compressor operating at
high speed and outdoor fan
operating at low speed
Integrated control
module diagnostic/status
LED display shows the
indicated code.
0
1
Low Side
Fault
LOW SIDE
FAULT
01
Low refrigerant
charge.
Restriction in
liquid line.
Indoor blower
motor failure.
Indoor
thermostat set
extremely low.
Verify refrigerant
charge; adjust as
needed.
Check for
restricted liquid
line; repair/
replace as
needed.
Check indoor
blower motor;
repair/replace as
needed.
Check indoor
thermostat setting.
Turn power OFF prior
to repair.
Fault will clear after 30
consecutive normal
cycles.
Fault may be cleared
by cycling 24VAC to
control.
Replace with correct
replacement part(s).
Compressor and outdoor
fan are off.
Thermostat demand is
present.
Integrated control
module diagnostic/status
LED display shows the
indicated code.
0
1
Low Pressure
Cut Out Trip
01
Low refrigerant
charge.
Restriction in
liquid line.
Indoor blower
motor failure.
Indoor
thermostat set
extremely low.
Verify refrigerant
charge; adjust as
needed.
Check for
restricted liquid
line; repair/
replace as
needed.
Check indoor
blower motor;
repair/replace as
needed.
Check low
pressure switch;
repair/replace as
needed.
Check indoor
thermostat setting.
Turn power OFF prior
to repair.
Replace with correct
replacement part(s).
