Self-Diagnosis - Mitsubishi Electric PEH-P8MYA Technical & Service Manual

• When there is no error at the outdoor unit. (If there is an error at the outdoor unit, it can be evaluated at LED 1 [digital
display] of the outdoor substrate.)
• The stop valves are open both the liquid and gas sides.
After checking the above, execute the test run in accordance with the following.
(2) Test run start and finish
• Operation from the indoor unit
Execute the test run using the installation manual for the indoor unit.
• Operation from the outdoor unit
Execute settings for test run start,finish and operation mode (cooling, heating) using the DIP switch SW 4 on the
outdoor substrate.
< SW4 >
OFF ON
A
1
B
2
a) Set the operation mode (cooling, heating) using SW 4-2
b) Turn ON SW 4-1, The operation mode for SW 4-2 will be adhered to, and the test run will commence
c) Turn OFF SW 4-1 to finish the test run
• There may be a faint knocking noise emitted from the proximity of the fan during the test run. This is torque
fluctuation occurring due to control of fan revolutions. There is no problem with the product.
Note:
The SW 4-2 operation mode cannot be changed during the test run. (To change test run mode, stop the equipment
with SW 4-1, change the operation mode, then restart test run with SW 4-1.)
• If the 2-hour timer is set,the test run will stop automatically after 2 hours.
• During the test run,the room temperature display on the indoor unit will indicate the temperature of the indoor unit
piping.

[3] Self-diagnosis

Use the remote controller to look up each units error history.
1.
ON
CHECK
CLOCK
ßC
STAND BY INDOOR UNIT
DEFROST
ADDRESS NO
2.
ON
CHECK
CLOCK
ßC
STAND BY INDOOR UNIT
DEFROST
ADDRESS NO
3. (1)
ON
CHECK
CLOCK
ßC
STAND BY INDOOR UNIT ERROR CODE
DEFROST
ADDRESS NO
b)
ON
CHECK
CLOCK
ßC
STAND BY INDOOR UNIT
DEFROST
ADDRESS NO
A Stop
B Cooling
C
C Operation
D
D Heating
1Hr.
OFF ßC
FILTER
CHECK MODE
FUNCTION
1Hr.
OFF ßC
FILTER
CHECK MODE
FUNCTION
1Hr.
OFF ßC
FILTER
CHECK MODE
FUNCTION
c)
a)
1Hr.
OFF ßC
FILTER
CHECK MODE
FUNCTION
d)
1. Change to self-diagnosis mode
Press the CHECK button twice within three seconds to show
the following
2. Select the refrigerant address number to be self-
diagnosed
Press the
refrigerant address numbers (00 to 15)and select the
refrigerant address number to be slf-diagnosed.
After three seconds from making the change,the lit refrigerant
address to be self-diagnosed will start to flash,and self-
diagnosis will commence.
3. Self-diagnosis result display
See the above chart for details of error code contents.
(1) When there is an error history
a) Alternating display
b) Error code
c) Attribute of error search
d) Unit number
–34–
buttons to scroll through the