Hitachi RAF-25NH4 Données Techniques page 203

<Reference>
If the 3A fuse has broken , the switching power circuit is defective. Replace the SW-D-P.W.B..
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In the case of that the 5A fuse in the control P.W.B has broken.
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(1) If the varistor 3 has broken, the terminal board L/N was supplied a excessive voltage.
Although the switching power circuit is normal , but have to check the DC voltage that leads to the terminal board L/N
terminal, and replace the varistor 3 and 5A fuse.
(2) If the varistor 3 has not broken , replace the control P.W.B. because the switching power circuit for control P.W.B. is
defective.
In the case of that the indoor unit of A or B cycle does not operate at all:
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(1) If the voltage on the C-D terminals of the in/outdoors connecting cable (check it at the indoor side as near as possible), is
normal, Be aware that the electric parts may also be defective.
(2) If the voltage is abnormal , check C and D of the terminal board in the in and outdoor unit both whether C and D are
connected in reverse.
If they are connected in reverse , the 35V output of the switching power circuit is cut off by a protector . At this time,
LD303A (green) or LD303B (green) blinks three times, the cable that has a blinking LED is in reverse connection. (LD303A
3 blinks, C1D1 or C2D2, or both be in reverse connection and LD303B 3 blinks.C3D3 or C4D4, or both be in reverse
connection)
(3) If you have checked that C and D are connect normally, unplug the power supply (turn off the overcurrent breaker) for a
moment and remove the in/outdoor connecting cable, then turn on the power supply and check the voltages on C1 and D1,
C2 and D2, C3 and D3, C4 and D4 each terminal of the outdoor unit terminal boards.
If being abnormal, replace the SW-D-P.W.B., but being normal, repair the electric parts because they are defective.
In the case of the indoor unit 1 and 4 (three rooms multi-type is unit 1-3) does not operate at all:
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(1) Check the connection of the in/outdoor connecting cable whether being in reverse or not )
(2) If the connections is not reverse,
check the voltage (230V is supplied) on the L and N terminals.
①
Replace the SW-D-P.W.B., if the connectors "CN1" and "CN8" leads the SW-D-P.W.B. with the control P.W.B. is
②
connected normally and the self-diagnosis lamp for the outdoor unit lights.
Replace the control P.W.B., if the self-diagnosis lamp does not light.
③
(Caution)
The outdoor unit does not operate at all (above mentioned) means the cases of that the indoor unit indicator, the operation
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indicator and the louver initializing, at the power supply turning on, can not turn on , equivalent to that the indoor unit is not
supplied with the power supply.
When removing the connectors and the in/outdoor connecting cable, unplug the power supply (turn off overcurrent breaker)
※
or the P.W.B. may be damaged.
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