Troubleshooting For Wiring (Interconnect Cable And Serial Signal Wire) - Toshiba RAS-18UFHP-E3 Service Manual

9-7. Troubleshooting for Wiring (Interconnect Cable and Serial Signal Wire)

9-7-1. Outdoor unit does not operate.
<Inspection procedure>
(1) Is the voltage between 2 and 3 of the indoor terminal block varied?
(2) Are signals from the indoor unit to the outdoor unit transmitted correctly based upon the following diagram?
NOTE:
• Measure the voltage for 2 minutes and 30 seconds after starting the unit.
• Prepare a diode for checking.
For Heat pump model
Terminal block on indoor side
Red
3
S5277G
2
White
1
Terminal block
Normal condition : Voltage varied between DC15V and 60V.
Abnormal condition : Voltage does not vary.
9-7-2. Outdoor unit stops a while after starting the unit.
<Confirmation procedure> Select one of 3 cases below and follow the procedure.
(1) The outdoor unit stops between 10 and 20 minutes passed after starting and it takes 10 minutes or more to
restart the unit.
Compressor is turned off and on automatically by thermo sensor
(Heating and Cooling Model) or thermostat (Cooling only Model).
(2) The outdoor unit stops once, it would not operate until the power is turned on again.
Refer to 9-6-3 "Compressor does not operate".
(3) The outdoor unit stops between 10 minutes to 1 hour after starting and a check code is indicated on the
remote control. (Check code 03-1E : Refer to Table 9-4-1.)
S5277G or equivalent
(G or J type)
(Diode with rated voltage of
400V or more is acceptable.)
Tester
Fig. 9-7-1
Gas has a low circulation.
Measure gas pressure.
– 69 –
FILE NO. SVM-04032
For Cooling only model
Terminal block on indoor side
Red
3
2
White
1
Terminal block
Normal condition : Equal 220Vac
Abnormal condition : Equal 0V
Gas shortage
Gas leak
Pipe clogging
Tester