Toshiba RAS-10YAV-E Service Manual page 50

10-5-2. Wiring Failure (Interconnecting and Serial Signal Wire)
(1) Outdoor unit does not operate
1) Is the voltage between
Confirm that transmission from indoor to outdoor is correctly performed based upon the following dia-
gram.
NOTE:
• Measurement should be performed 2 minutes and 30 seconds after starting of the operation.
• Be sure to prepare a diode for judgment.
Terminal block at indoor side
Red
White
Normal time : Voltage swings between DC15 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 does not operate until the power will be 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
P.M.V. is defective.
Miswiring of connecting wires of indoor/outdoor units
Clogging of pipe and coming-off of TC sensor
R S
and of the indoor terminal block varied?
3
S5277G
2
1 Terminal block
– 50 –
S5277G or equivalent (G or J type)
(Diode with rated voltage of 400V
or more is acceptable.)
Tester
Gas shortage
Gas leak
Pipe clogging
Refer to the chart in 10-6.