Faults of indoor unit
If the indoor unit has any fault, the fault code will be displayed on its wired controller and display
screen (if any), which will disappear after the fault is eliminated.
Fault
code
Name of fault
Judgement conditions
for fault
Fault
phenomenon
Fault possibility and treatment
Fault recovery
E20
Capacity detection
of indoor unit
Capacity DIP of indoor unit
only supports
{0,1,2,3} at present.
Display the fault
code and the
indoor unit stops
Error setting of capacity DIP of indoor
unit;
Loose contact of the indoor unit boards;
Automatic
recovery.
E21
Indoor ambient
temperature T1
sensor has fault
Thermostat can
ď
t receive
the signals from ambient
temperature sensor and
controller temperature
sensor.
Display the fault
code and the
indoor unit stops
Temperature probe is damaged;
Poor contact of the connecting line of
temperature probe.
Automatic
recovery if any
temperature
returns to
normal.
E22
Indoor coil inlet
temperature T2
sensor has fault
Open circuit or short circuit
appear to indoor coil inlet
temperature T2 sensor
Display the fault
code and the
unit continues to
run.
Temperature probe is damaged;
Poor contact of the connecting line of
temperature probe.
Automatic
recovery
E23
Indoor coil midpoint
temperature T3
sensor has fault.
Open circuit or short circuit
appear to indoor coil
midpoint temperature T3
sensor
Display the fault
code and the
unit continues to
run.
Temperature probe is damaged;
Poor contact of the connecting line of
temperature probe.
Automatic
recovery.
E24
Indoor coil outlet
temperature T4
sensor has fault
Open circuit or short circuit
appear to indoor coil outlet
temperature T4 sensor
Display the fault
code and the
unit continues to
run.
Temperature probe is damaged;
Poor contact of the connecting line of
temperature probe.
Automatic
recovery.
E25
Condensate pump
level switch has fault
Disconnection signal has
been detected for twice
continuously from level
switch.
Display the
fault code and
the indoor unit
stops.
Not provide 220-240V power, check the
power at both ends of the switch.
Short circuit of float switch or poor
contact plug connectors, check
conduction state of the line.
Drainage pump is bad, replace it.
Drainage pipe is blocked or inclines
upward, dredge it.
Poor condition of indoor unit PCB board,
replace it.
Close signal of
level switch is
detected. Manual
recovery
E26
Indoor coil low
temperature
protection
Indoor coil midpoint
temperature T3 < -4
ņ
for 3
minutes continuously under
cooling mode.
Display the
fault code and
the indoor unit
stops.
Poor heat exchange of indoor unit under
cooling mode. If the return air strainer
is contaminated, the fan doesn't run, air
duct is blocked or coils of the electronic
expansion valve are damaged, indoor
coil temperature probe may be
damaged.
Outdoor coil
midpoint
temperature
T3
≥
10
ņ
,
automatic
recovery.
E27
Indoor coil high
temperature
protection
Indoor coil midpoint
temperature T3
≥
56
ņ
under heating mode
Display the
fault code and
the indoor unit
stops.
Poor heat exchange of indoor unit
under heating mode. If the return
air strainer is contaminated, the fan
doesn
ď
t run, air duct is blocked or
coils of the electronic expansion valve
are damaged, indoor coil temperature
probe may be damaged.
Outdoor coil
midpoint
temperature
T3
≥
50
ņ
,
automatic
recovery.
E29
Communication fault
between indoor and
outdoor units
Receive no communication
signal from outdoor unit for
1 min continuously after
indoor unit is started.
Display the
fault code and
the indoor unit
stops.
Poor contact of the connecting line
between outdoor unit and indoor unit.
PCB board of indoor/outdoor unit is
damaged, replace it.
Automatic
recovery after
communication
signal is received
from outdoor
unit.
E32
Reserved Reserved
Reserved
Reserved
Reserved
Trouble shooting
AMS-SVX01A-EN
45
Содержание TX536
Страница 9: ...System diagram AMS SVX01A EN 9 ...
