Sanyo SAP-KMRV93GJH Technical & Service Manual page 35

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 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
Checking the serial communications
Initial self-
diagnostics
(1) illuminate
(1) and (3) illuminate,
and (2) flashes.
Turn the power OFF before performing short circuiting work.
During the self-diagnostics check, the check results are the first indication when the operation switch is moved to OFF while the
indicators are flashing after power ON → DEMO (5 seconds) → ON.
So that the check can be made quickly, indicators flash at first communication after power ON.
Before performing the above checks, perform DEMO operation, and check that AC 220 V is output to terminals 1 and 2.
If it is not output, there is a failure related to the indoor unit power.
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.
→ Control 1
Short-circuit terminals 2 and 3 on
the indoor unit 3P terminal block.
No change
Change: (1) and (3) illuminate,
and (2) flashes.
Change: (1) and (3) illuminate,
and (3) flashes.
• 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.
→ Control 2
Short-circuit terminals 2 and 3 on
the indoor unit 3P terminal block.
Change: (1) and (3) illuminate,
and (2) flashes.
Change: (1) illuminates
31
TEST/T-RUN terminals
TEST/MV T-RUN
Probable location of malfunction
Indoor unit circuit board failure
Outdoor unit circuit board failure
Failure (open circuit, contact failure, etc.)
in the inter-unit cable
Indoor unit circuit board failure
COM