40
Installation and Maintenance
Service Manual
32
0DOIXQFWLRQ
of zero-cross
derection
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and
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17
times
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1
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abnormal
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of indoor control
mainboard is
abnormal
33
C o m p r e s s o r
lose steps
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times
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Cooling
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34
IPM temp.is too
limit/decrease
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for 20 mins and
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$3V,30PRGXOH
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2.3OHDVHLPSURYH
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board AP1
35
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abnormal
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2.Wire terminal 4V
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damaged,replace 4V
36
A n t i - f r e e z i n g
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)+
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limited or decrease
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is poor or fan speed is
to low