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17.5.5 H16 (Outdoor Current Transformer Open Circuit)
Malfunction Decision Conditions
An input current, detected by Current Transformer CT, is below threshold value when the compressor is
operating at certain frequency value for 3 minutes.
Malfunction Caused
Lack of gas.
Broken CT (current transformer).
Broken Outdoor PCB
Troubleshooting
When abnormality indication starts again
Refer to Service Manual Technical Graph
In forced cooling, check suction ressure
Running current and suction pressure is ● Compressor Lack Compression
● Replace Compressor
● Check & replace defected CT
Running current is much too low and
● Check for gas leaking source; Repair
For safety reason and to
prevent component
breakdown, always switch off
the power before remove and
connect the component.
normal
Suction pressure and running current is
for Temp vs Current and Pressure
versus running current
very low
blockage; Replace defected part(s)
● Capillary tube/expansion valve
or replace defected part(s)
suction pressure is much too high
Caution
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