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Dc Inverter VRF plus Water Heater Solution Service Manual SERVICING
SERVICING
1 LIST OF UNIT ERRORS
1.1 List of Error Display on Wired Controller
Error
Code
Error
Description
Source of Error
Signal
Notes on Control
E1
Compressor
high-pressure
protection
High-pressure
Switch
The high pressure protection value is 4.2MPa. When it is detected
three times successively that a compressor is under high
pressure, this compressor will be stopped. In this case, error code
E1 will be displayed and the run indicator will blink.
E2
Indoor
antifreeze
protection
Evaporator
sensor
When it is detected for 10 minutes successively that T
evap.
is
≤
-2
℃
(varying with indoor unit), the antifreeze protection will be
activated, in which case the outdoor unit will immediately shut off
the indoor electronic expansion valve and the capacity will be set
to “0”.
E3
Compressor
low-pressure
protection
Low-pressure
Switch
When the low pressure reaches the protection value (absolute
pressure: 0.15MPa), the low pressure switch will be cut off, in
which case the low pressure protection will be displayed.
E4
Compressor
exhaust
temperature
protection
Exhaust
temperature
sensor
When the exhaust temperature (T
exhau.
) is equal to and higher
than 113 , the compressor will be stopped. Upon the first
℃
occurrence of exhaust protection, the error code E4 will be
displayed. When the exhaust temperature is lower than TR , the
℃
compressor will resume to operation after it has been stopped for
3 minutes. The compressor can resume to operation for the first
two times. But if this occurs three times successively in 1 hour, the
unit must be disconnected from power supply before it can
restarted.
E5
Frequency
converter
overcurrent
protection
Compressor
drive
The drive board of variable frequency compressor is incurred to
error. For details on the error message, please refer to the Display
Code on Digital Tube of Outdoor Unit.
E6
Communication
error
Communication
The mainboard of indoor unit or the wired control is incurred to
communication error with outdoor unit. The indoor unit incurred to
communication error will be stopped and display the error code.
E7
Mode conflict
User operation
The run mode of the unit that is started later is inconsistent to the
mode that is started earlier. Only the cooling and dry mode has
possible mode conflict against the heat mode. For fan mode,
there is no mode conflict against the cooling, dry or heat mode. In
case mode conflict occurs, the indoor unit with mode conflict will
display E7 and be stopped.
E9
Water-full
protection
Water pump
When water full is detected for 8 seconds successively, the
system will enter into water-full protection state, in which case the
wired controller will display E9 and give out alarm. In case of
water-full protection under each mode, the other loads of the
indoor unit will be stopped, except that the water pump will remain
working and give out alarm. In this case, the outdoor unit shall
adjust the capacity output accordingly
F0
Indoor ambient
temperature
sensor error
Indoor room
sensor
The indoor unit incurred to sensor error will display error code and
be stopped.
F1
Indoor coil inlet
temperature
sensor error
Indoor coil-inlet
temperature
sensor
The indoor unit incurred to sensor error will display error code and
be stopped.
F2
Indoor coil
middle
temperature
sensor error
Indoor
coil-middle
temperature
sensor
The indoor unit incurred to sensor error will display error code and
be stopped.
F3
Outdoor coil
inlet
temperature
sensor error
Indoor coil-exit
temperature
sensor
The indoor unit incurred to sensor error will display error code and
be stopped.