Toshiba RAS-10UKV-E Service Manual page 56

10-5-2. Wiring Failure (Interconnected and serial signal wire)
(1) Outdoor unit does not operate.
1) Is the voltage between 2 and 3 of the indoor terminal block varied?
Confirm that transmission from indoor to outdoor is correctly performed based on the following diagram.
NOTE:
•
Measurement should be performed 2 minutes and 30 seconds after starting operation.
•
Be sure to prepare a diode for judgment.
Terminal block on indoor side
Red
3
2
White
1
Normal time : Voltage swings between DC15V and 60V.
Abnormal time : Voltage does not vary.
(2) Outdoor unit stops in a little while after operation started.
<Check procedure> Select phenomena described below.
1) The outdoor unit stops 10 to 20 minutes after operation started, and 10 minutes or more are
required to restart the unit.
Gas circulation amount is down.
Measure gas pressure.
Thermo operation of compressor
2) If the unit stops once, it dose not operate until the power is turned on again.
To item of compressor does not operate.
3) The outdoor unit stops 10 minutes to 1 hour after operation started, and an alarm is displayed.
(Discharge temp. error check code 03, 1E Sensor temp. error check code 02, 1C)
Gas leak
Miswiring of connecting wires of indoor/outdoor units
Clogging of pipe and coming-off TC sensor
S5277G
Tester
Terminal block
S5277G or equivalent (G or J type)
(Diode with rated voltage of 400V
or more is acceptable.)
Gas shortage
Gas leak
Pipe clogging
Refer to the chart in 10-6
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FILE NO. SVM-02007