●Troubleshooting
79
Troubleshooting
7
Troubleshooting
Troubleshooting According to Symptoms
１
If an operation shows an abnormality even though no alarm code is displayed, refer to the following information to take measures.
Item Condition Cause Measure
1
The unit does not run at all.
(The POWER lamp on the control
panel is unlit.)
(1) The main power supply is OFF.
Check that power is supplied to the
power supply terminal.
(2)
(for models with a breaker)
The electric component breaker has
tripped.
Or, it has not been turned ON.
Open the switch box cover and check
if the breaker has tripped.
(3) The wiring that supplies power to
the control board is disconnected or
broken.
Check the wiring between the control
board and the inverter board.
2
The control panel displays “ACF”
and then turns off.
(1) The main power supply is OFF.
This is the normal operation when the
main power supply is OFF. Check that
power is supplied to the power supply
terminal.
3
The pump/fan is operating, but the
control panel is unlit.
(1) The wiring for the control panel is
disconnected or broken.
Check the wiring between the control
board and the control panel.
4 Pump/fan does not run.
(1) The remote control input ([10]–[11])
is OFF.
Check the connection of the remote
control input.
(2)
The unit has been set to the
operation lock mode.
(With the factory setting, the
operation Loc
k mode is selected.)
Cancel the operation Lock mode on
the control panel.
(See page 60.)
(3) The pump wiring is disconnected. Check the pump wiring.
5
Oil does not flow, although the
pump is running.
Because the oil circulation
quantity is insufficient,
the pump sound level is large.
(1) The pump suction pipe connection
is loose.
Check the seal of the pipe and
retighten.
(2) The suction strainer is clogged.
Clean the suction strainer.
If the oil in the oil tank is dirty, replace
the oil.
(See page 161.)
(3) The oil level in the oil tank has
decreased.
Refill oil into the oil tank.
(4)
Because of a large pressure loss
in the oil discharge pipe, the pump
relief valve is activated.
Increase the oil pipe diameter, and
shorten the pipe length.
Check that the oil viscosity is within
the specified operating range.
(5)
Because of a large pressure loss in
the oil suction pipe, cavitation has
occurred with the pump.
6
The compressor does not run,
although the pump is running.
(1)
The compressor is stopped under
temperature control.
– – –
(2) The compressor restart prevention
timer has been activated.
Check if the compressor starts after
elapse of the timer time (about 2
minutes).
(3)
The low oil temperature protection
device has been activated. (Inlet oil
temperature is 2℃ or lower.)
Check if the compressor normally
operates at 5℃ or higher oil
temperature.
(4)
The low ambient temperature
protection device has been activated.
(Room temperature is –2℃ or lower.)
Check if the compressor normally
operates at 0℃ or higher room
temperature.
(5) The capacity setting is 0%
(Operation mode 9).
Operate in an operation mode
appropriate for use.
00_PB00540A_M10.indb 79 2023/08/09 12:59:04
To Next Page
Loading...
