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■ If the self-diagnostics function fails to operate
<Checking the indoor and outdoor units>
■ Checking the indoor unit
No.
1
Set operation selector of indoor unit main
body to DEMO and start operation using the
remote controller.
● If there are no problems with the above, then check the outdoor unit.
■ Checking the outdoor unit
No.
1
Apply the rated voltage between outdoor
unit terminals 1 and 2.
2
Short-circuit the outdoor unit COM terminal
to the T-RUN terminal.
● If there are no problems with the above, then check the indoor unit.
● Using the TEST/T-RUN terminals
T-RUN
TEST/MV : Compresses time to 1/60th (accelerates
Check the indoor unit.
Is the fuse blown?
Normal
Replace the controller.
Control
Control
: Test run (compressor and fan motor turn ON.)
operation by 60 times faster than normal).
Fully opens the electric expansion valve.
• No indicators illuminate and the
indoor fan does not turn.
• Check the power voltage.
Blown
Replace the circuit
board or the fuse.
Check items (unit operation)
• The rated voltage must be present between inter-unit cables 1 and 2.
• Connect a 5 kΩ resistor between inter-unit cables 2 and 3. When the
voltage at both ends is measured, approximately 12–15 V DC must
be output and the needle must fluctuate once every 8 seconds.
In addition, insert an LED jig and check that the LED flickers once
every 8 seconds.
Check items (unit operation)
• The control panel LED (red) must illuminate.
• The compressor and fan motor must turn ON.
18
TEST/T-RUN terminals
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