Lennox Y6760, Руководство по обслуживанию

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33
Installation and Maintenance
Service Manual
9. Maintenance
9.1 Error Code
No. Malfunction
Name
Display Method
of Indoor Unit
(Error Code)
A/C Status
Possible Causes(For specific maintenance method, please
refer to the following procedure of troubleshooting)
1
Indoor ambient
temperature
sensor is
open/short-
circuited
F1
The unit will stop operation
as it reaches the temperature
point. During cooling and drying
operation, except IDU fan
motor operates, other loads
stop operation; During heating
operation, the system stops
operation.
1. The wiring terminal between indoor ambient temperature
sensor and main board is loosened or poorly contacted;
2. There’s short circuit due to trip-over of the parts on controller;
3. Indoor ambient temperature sensor is damaged (Please
check it by referring to the resistance table for temperature
sensor)
4. Main board is broken.
2
Indoor
evaporator
temperature
sensor is
open/short-
circuited
F2
The unit will stop operation
as it reaches the temperature
point. During cooling and
drying operation, except IDU
fan operates, other loads stop
operation; During heating
operation, the complete unit
stops operation.
1. The wiring terminal between indoor evaporator temperature
sensor and main board is loosened or poorly contacted;
2. There’s short circuit due to the trip-over of the parts on
controller;
3.Indoor evaporator temperature sensor is damaged (Please
check it by referring to the resistance table for temperature
sensor)
4. Main board is broken.
3
Blocked
protection of
IDU fan motor
H6
IDU fan, ODU fan, compressor
and electric heat tube stop
operation. Horizontal louver stops
at the current position.
1. The feedback terminal of PG motor is not connected tightly.
2. The control terminal of PG motor is not connected tightly.
3. Fan blade rotates unsmoothly.
4. Malfunction of motor
5. Main board is broken.
4
Malfunction
protection of
jumper cap
C5
Operation of remote controller or
control panel is available, but the
unit won’t act.
1. There’s not jumper cap on the main board.
2. Jumper cap is not inserted properly and tightly.
3. Jumper cap is damaged.
4. Controller is damaged.
5
Overcurrent
protection(This
protection
function is not
available for
those models
whose cool-
ing capacity
≤12000Btu/h)
E5
During cooling and drying
operation, except IDU fan
motor operates, other loads
stop operation; During heating
operation, the system stops
operation.
1. Unstable supply voltage. Normal fl uctuation shall be within
10% of the rated voltage on the nameplate.
2. Supply voltage is too low and load is too high.
3. Measure the current of live wire on main board. If the current
isn’t higher than the overcurrent protection value, please check
the controller.
4. The indoor and outdoor heat exchangers are too dirty, or the
air inlet and air outlet are blocked.
5. The fan motor is not running. Abnormal fan speed: fan speed
is too low or the fan doesn’t run
6. The compressor is not running normally. There is abnormal
sound, oil leakage or the temperature of the shell is too high,
etc.
7. There’s blockage in the system (filth blockage, ice plug,
greasy blockage, Y-valve hasn’t been opened completely)
6 Overload
malfunction
E8 Unit stops working.
1. Outdoor and indoor heat exchangers are too dirty or the
air inlet/outlet is blocked
2. Fan motor is not working. Abnormal fan speed; fan
speed is too low or the fan doesn’t run.
3. Compressor doesn’t work normally. Strange noise or
leakage occurs. Temperature of the shell is too high.
4. System is blocked inside (dirt block, ice block, oil block,
Y-valve not fully open)
5.Temperature sensor of main board doesn’t sense
correctly.
7
Zero-crossing
inspection
circuit
malfunction
of the IDU fan
motor
U8
Operation of remote controller or
control panel is available, but the
unit won’t act.
1. Quick de-energization and energization. Wrong judgement
by the controller because the electric-discharging of capacitor is
slow.
2. Zero-crossing inspection circuit of main board for controller is
abnormal.