Hitachi RAF-35RPA RAF35RPA User Manual
Product codes
RAF35RPA
14-20
LD301 blinks 9 times.
Communication error.
Communication error.
Is the connecting cable connected properly?
(Is 35V being output on the indoor unit?)
(Is 35V being output on the indoor unit?)
Connect properly
Is DC35V being output between
terminals C-D? Normal: DC32~39V.
terminals C-D? Normal: DC32~39V.
Is DC35V being output
at both ends of R35?
at both ends of R35?
Replace the main
PWB. Defective SW
power supply
PWB. Defective SW
power supply
Replace the main PWB. NF coils,
IF coils, etc may be broken.
IF coils, etc may be broken.
Check the interface circuit and replace
the main PWB if necessary.
the main PWB if necessary.
LD301 blinks 7 times.
Thermistor abnormal
Thermistor abnormal
Is the thermistor connector disconnected? ※The
problem maybe ”miss to connect back after servicing.”
problem maybe ”miss to connect back after servicing.”
Connect the
thermistor
thermistor
Is the conitnuity of the thermistor
normal?
normal?
Replace the
thermistor
thermistor
Is the thermistor
circuit normal?
circuit normal?
Replace parts in the
thermistor circuit.
thermistor circuit.
Check continuity of pattern and
lead wires according to the PWB
and schematic diagrams
lead wires according to the PWB
and schematic diagrams
LD301 blinks 6 times. OH
thermistor detect temperature rise
thermistor detect temperature rise
Is the thermistor
circuit normal?
circuit normal?
Replace parts in the
thermistor circuit.
thermistor circuit.
LD301 blinks 5 times. Overload
lower limit cut
lower limit cut
Replace main
PWB
PWB
LD301 blinks 4 times.
Failure of switching
Failure of switching
Is the 15V power
supply output
normal? (Main PWB)
supply output
normal? (Main PWB)
Is the intelligent
power module
(PM) normal?
power module
(PM) normal?
The intelligent power
module may be defective.
Replace the main PWB
module may be defective.
Replace the main PWB
LD301 blinks 3 times.
Abnormal low speed
Abnormal low speed
With CN3 and CN4 disconnected, is the 15V output
between the “15V” and “15-0V” on the main PWB?
between the “15V” and “15-0V” on the main PWB?
Replace the main PWB
LD301 blinks 2 times.
Peak current-cut
Peak current-cut
Is the intelligent power
module (IPM) normal?
module (IPM) normal?
Replacethe intelligent power
module (IPM) with the main PWB
module (IPM) with the main PWB
LD301 blinks 1 time.
Reset stop
Reset stop
Is the reset circuit
normal? ( pinn⑦ at
CN18 is about 5V)
normal? ( pinn⑦ at
CN18 is about 5V)
Replace the PWB
Make sure again that connectors
are connected securely
are connected securely
Perform the final
operation check
operation check
No
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
No
No
Yes
No
Yes
No
Yes
No
Yes
No
No
Yes
No
Yes
Yes
No
Yes
Yes
No
Yes
Yes
No
No
※However, the unit always
reset and stops just after
power is supplied: this does
not indicate a fault
power is supplied: this does
not indicate a fault