Central air conditioning can not refrigerate, why heat only?

- Oct 10, 2014 -

After startup, testing machine four valve coil is 220V, the amount of board 4V end four valve output relay contact output, check the corresponding no adhesion phenomenon, the relay coil is DC 12V, careful observation, in the end of the outdoor machine motherboard 4V compressor shutdown, 4V end output a compressor, 4V, electricity, air conditioning connecting pipe wrapped with dressing well loosen check, finally, at the end of the export pipeline machine to find the reasons for the failure, the original signal line bitten by rats 4V line and compressor control line, a copper wire, was installed two bandage tied after touch together, cause this fault will be damaged, wrapped with insulation tape, refrigeration test machine works.

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