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11-5-2. Wiring Failure (Interconnecting and Serial Signal Wire)
(1) Outdoor unit does not operate
1) Is the voltage between
and
of the indoor terminal block varied?
2) Confirm that transmission from indoor unit to outdoor unit is correctly performed based upon the following
diagram.
NOTE
• Measurement should be performed 2 minutes and 30 seconds after starting of the operation.
• Be sure to prepare a diode for judgment.
Normal time
:Voltage swings between DC15 and 60V. ........................ Inverter Assembly check
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.
2) If the unit stops once, it does not operate until the power will be turned on again.
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)
Terminal block at indoor side
Red
White
Terminal block
Tester
S5277G or equivalent (G or J type)
(Diode with rated voltage of 400V
or more is acceptable.)
Gas circulation amount is down.
Measure gas pressure.
Thermo. operation of compressor
Gas shortage
Gas leak
Pipe clogging
To item of Outdoor unit does not operate.
Gas leak
P.M.V. is defective.
Miswiring of connecting wires of indoor/outdoor units
Clogging of pipe and coming-off of TC sensor
Refer to the chart in 11-6.