6 - 24
2WAY SYSTEM
Trouble Diagnosis
6
3. 2WAY Alarm Codes
P22, P24 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
P22, P24
P22 : Fan motor 1 trouble
P24 : Fan motor 2 trouble
Fan motor start failure, fan motor Hall IC input failure
(1) Wiring failure
(2) Fan PCB failure
(3) Fan failure
(4) Fan motor failure
(5) HIC PCB failure
Check
(1) Check the wiring.
Check whether the following items are missing or connection failure.
(2) Right or wrong decision of HIC PCB IPM
Carry out the judgement of HIC PCB IPM in the following method. If the result of
measurement shows the resistance value of the fault diagnosis, replace the HIC PCB.
■ Right or wrong decision of HIC PCB IPM
Measure the resistance value between the + side (P) and - side (NW) of the HIC PCB.
・
Use the analogue tester when measuring. Measure by the kΩ-range.
・
Measure as single item PCB. (Remove the wires, etc.)
・
Measure as terminal part. (See the figure.)
Resistance value of fault diagnosis: Less than 1kΩ
(3) Check the fan rotation.
Check if there is any obstacle affecting fan rotation.
(4) Check the abonormal fan motor.
Rotate the fan manually and check whether the fan rotates smoothly.
If the fan cannot rotate smoothly and it is necessary to rotate forcibly, the fan motor is
abnormal. (Compare with the normal unit.) Check the status without wires (x2) from the fan
motor to the PCB.
Correction
Example
Notes
(1) Correct the wiring.
(2) Remove the obstacles attached to the fan.
(3) Replace the fan motor.
(4) Replace the fan PCB.
(5) Replace the HIC PCB.
—
Turn OFF the power, and check the continuity of “+” and “–” on the FAN PCB.
P20 Alarm
Alarm code
P20
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
High load alarm
The high pressure increase is not rapid but the alarm occurs when the horsepower down does
not meet the anticipated time.
(1) Forgot to open the valve.
(2) Operation failure of mechanical valve
(3) Idle away of outdoor fan
Check the valve, mechanical valve and outdoor fan.
—
—
—
FAN PCB
+(P)
-(NW)
SM830253-00_欧州2way7_SM-TRSM.indb 24
16/08/02 14:02:52
