Voltage protection
Check the voltage of
outdoor unit power supply.
Make sure the voltage
between L(L1) and N (L2) is
about 187~253VAC.
Check the power supply.
Check whether the voltage
of IPM board P and N is
normal: DC277-356V for
18-27KBtu/h; DC277-410V
for 36KBtu/h.
Replace bridge rectifiers
and then check whether the
system can run normally
(Only for qua-zone).
.draob MPI ecalpeR
Check to ensure the
system runs normally.
Replace outdoor main board.
Yes
No
No
No
No
Yes
Issue is resolved.
Yes
Yes
DLCM(R/H)B: Service Manual
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