Daikin REMQ14PY1 [303/491] Caution be su re to t u rn off power s witch b efore connect or di s connect connector or p a rt s d a m a ge m a y b e occ u rred
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Daikin REMQ14PY1 [303/491] Caution be su re to t u rn off power s witch b efore connect or di s connect connector or p a rt s d a m a ge m a y b e occ u rred

Daikin REMQ8PY1 [303/491] Caution be su re to t u rn off power s witch b efore connect or di s connect connector or p a rt s d a m a ge m a y b e occ u rred
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Remove the connection between
the compressor and inverter. Set
the power transistor check mode
ON using “Setting mode 2” of the
outdoor unit PC board.
Measure the inverter output voltage
(∗2).
Note: Measurement should be made
while the frequency is stable.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check if
the stop valve is
open.
Check if
the relay wires to the
compressor are
correct.
Check if the
connection of UVW
phase order is
correct.
Check if the
wiring is the same as in
the electric wiring
diagram.
The
insulation resistance
of the compressor is low (not
more than 100kΩ).
The
compressor coil has
disconnection of
wires.
Restart and
check the operation.
Check if the condition
occurs again.
Check if
the start mode is in
the high differential pressure
(not less than 0.5
MPa).
Check if
the inverter output
voltage between 3
phases is within
± 5V.
Power ON
Power OFF
Conclude the work
There is a possibility of defect of
pressure equalizing.
Check the refrigerant circuit.
Defect of pressure equalizing
Check the refrigerant circuit.
Local factor
Open the stop valve.
Replace the connecting wires and
ensure right connection of the
connector.
Ensure correct connection.
Ensure correct connection.
Replace the compressor.
Check if the wiring has
any error in mistake for
inverter compressor.
Replace the inverter PC board.
Replace the inverter compressor.
∗1: Pressure difference between high pressure and low pressure before starting.
∗2: The quality of power transistors/ diode modules can be judged by executing Check 4 (P349).

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