Checking The Indoor And Outdoor Units; Checking The Indoor Unit; Checking The Outdoor Unit - Sanyo SAP-CRV93EHN Technical & Service Manual

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If self-diagnostics function fails to operate
<Checking the indoor and outdoor units>

Checking the indoor unit

No.
1 Use the remote controller to operate the
unit in "TEST run" mode. To determine
whether the mode is currently in "TEST run"
mode, check the 3 indicator lamps on the
unit. If all 3 are blinking, the current mode is
"TEST run."
For the "Test run" procedure, refer to 7.4 "How to Test Run the Air Conditioner."
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 serial communications
Initial self-
diagnostics
(1) illuminates
(1) and (3) illuminate,
and blinks.
Turn the power OFF before performing short circuiting procedures.
Refer to the previous pages when performing system self-diagnostics.
So that the check can be made quickly, indicators blink at first communication after power ON.
Before performing the above checks, perform "TEST run" operation, and check that the rated voltage is output to terminals 1 and 2 on
the outdoor unit. 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).
→ Control 1
Short-circuit terminals 2 and 4 on
the indoor unit terminal base.
No change
Change: (1) and (3) illuminate,
and (2) blinks.
Change: (1) and (3) illuminate,
and (3) blinks.
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• No indicators illuminate and the
indoor fan does not rotate.
• 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 4. When the
voltage at both ends is measured, approximately 12–15 V DC must
be output and the multimeter pointer must bounce once every 8
seconds.
Or instead of measuring the voltage, you can 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, fan motor, and 4-way valve must all turn ON.
→ Control 2
Short-circuit terminals 2 and 4 on
the indoor unit terminal base.
Change: (1) and (3) illuminate,
and (2) blinks.
Change: (1) illuminates
40
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 wiring
Outdoor unit circuit board failure
COM