Mitsubishi Electric Mr. Slim PUHZ-SHW230YKA Service Manual page 15

8-2. CHECK POINT UNDER TEST RUN
Before test run
• After installation of outdoor unit, piping work and electric wiring work, re-check that there is no water leakage, loosened con-
nections and incorrect polarity.
• Measure impedance between the ground and the power supply terminal block (L, N) on the outdoor unit by 500 V Megger
and check that it is 1.0 M or over.
• Turn on power supply 12 hours before test run in order to protect compressor.
• Make sure to read operation manual before test run. (Especially items to secure safety.)
Warning:
Do not use the system if the insulation resistance is less than 1.0 MΩ.
Caution:
Do not carry out this test on the control wiring (low voltage circuit) terminals.
Self-check
1 Turn on the power.
2 Press [CHECK] button twice.
3 Press [CHECK] button twice to fi nish self-check.
A CHECK button B IC : Interface or FTC unit
Check code Symptom
P1 Flow water (TH1) sensor error
P2 Refrigerant liquid Pipe (TH2) sensor error
P6 Freezing/Overheating protection operation
P9 Actual tank temp. (TH5) sensor error
Fb FTC unit control system error (memory error, etc.)
E0~E5 Signal transmission failure between remote controller and FTC.
E6~EF Signal transmission failure between outdoor unit and FTC.
– – – – No trouble generated in the past.
FFFF No corresponding unit
U*, F* Outdoor unit failure. Refer to the outdoor unit wiring diagram.
For description of each LED (LED1~5) provided on the FTC, refer to the following table.
LED 1 (Power for microprocessor)
LED 2 (Power for remote controller)
LED 3 (Communication between FTC
and outdoor unit)
LED 4
LED 5
OCH534
OC : Outdoor unit
Indicates whether control power is supplied. Make sure that this LED is always lit.
Indicates whether power is supplied to the remote controller. This LED lights only in
the case of the FTC unit which is connected to the outdoor unit refrigerant address "0".
Indicates state of communication between the FTC and outdoor unit. Make sure that
this LED is always blinking.
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15
C Check code
ERROR CODE
TEMP. ON/OFF