Troubleshooting MCAC-UTSM-2008-05
50 Outdoor Units
3. Timer lamp flash at 5Hz: Communication malfunction between indoor/outdoor units
Timer lamp flash at 5Hz
Communication malfunction between indoor/outdoor units
Judge 3: Check whether the signal wiring between the
indoor and outdoor units is wrong polarity?
Connect the signal wiring correctly
Yes
No
Judge 4: Check whether the signal wiring between the
indoor and outdoor units is broken?
Yes
Replace the broken wiring
No
Judge 2: Check whether the signal wiring is shield cable or
whether the shield cable is earthing
Yes
Adopt the shield cable/ shield cable earthing
No
Indoor or outdoor main board is broken, replace the
main board until the malfunction is disappear
Judge 1: Check whether the indoor unit power is on
Turn on the indoor unit power
No
Yes
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