MULTI TYPE
MULTI TYPE
MULTI TYPE
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Main<br />
remote<br />
controller<br />
P04<br />
P05<br />
P07<br />
P10<br />
Check code<br />
Outdoor 7-segment display<br />
Check<br />
code<br />
P04<br />
P05<br />
P07<br />
P10<br />
Sub-code<br />
01: Compressor<br />
1 side<br />
02: Compressor<br />
2 side<br />
03: Compressor<br />
3 side<br />
00:<br />
01: Compressor<br />
1 side<br />
02: Compressor<br />
2 side<br />
03: Compressor<br />
3 side<br />
01: Compressor<br />
1 side<br />
02: Compressor<br />
2 side<br />
03: Compressor<br />
3 side<br />
Detected indoor<br />
address<br />
AI-NET central<br />
control<br />
remote<br />
controller<br />
21<br />
AF<br />
1C<br />
0b<br />
P12 – – 11<br />
Location<br />
of<br />
detection<br />
IPDU<br />
I/F<br />
IPDU<br />
I/F<br />
Indoor<br />
unit<br />
Indoor<br />
unit<br />
Description<br />
Activation of highpressure<br />
SW<br />
Detection of open<br />
phase/phase sequence<br />
Inverter DC voltage<br />
(Vdc) error<br />
(compressor)<br />
MG-CTT error<br />
Heat sink overheating<br />
error<br />
System<br />
status<br />
All stop<br />
All stop<br />
All stop<br />
Error detection<br />
condition(s)<br />
High-pressure SW is<br />
activated.<br />
• Open phase is<br />
detected when<br />
power is turned<br />
on.<br />
• Inverter DC<br />
voltage is too high<br />
(overvoltage) or<br />
too low<br />
(undervoltage).<br />
Temperature sensor<br />
built into IGBT (TH)<br />
is overheated.<br />
Indoor overflow error All stop • Float switch<br />
operates.<br />
• Float switch circuit<br />
is open-circuited<br />
or disconnected at<br />
connector.<br />
Indoor fan motor error<br />
Stop of<br />
corresponding<br />
unit<br />
• Motor speed<br />
measurements<br />
continuously<br />
deviate from target<br />
value.<br />
• Overcurrent<br />
protection is<br />
activated.<br />
Check items (locations)<br />
• Check connection of highpressure<br />
SW connector.<br />
• Check for defect in Pd<br />
pressure sensor.<br />
• Check outdoor service valves<br />
(gas side, liquid side) to<br />
confirm full opening.<br />
• Check for defect in outdoor<br />
fan.<br />
• Check for defect in outdoor<br />
fan motor.<br />
• Check outdoor PMVs (PMV1,<br />
2) for clogging.<br />
• Check indoor/outdoor heat<br />
exchangers for clogging.<br />
• Check for short-circuiting of<br />
outdoor suction/discharge air<br />
flows.<br />
• Check SV2 circuit for<br />
clogging.<br />
• Check for defect in outdoor<br />
P.C. board (I/F).<br />
• Check for error in indoor fan<br />
system (possible cause of air<br />
flow reduction).<br />
• Check opening status of<br />
indoor PMV.<br />
• Check indoor-outdoor<br />
communication line for wiring<br />
error.<br />
• Check for faulty operation of<br />
check valve in discharge pipe<br />
convergent section.<br />
• Check gas balancing SV4<br />
valve circuit.<br />
• Check SV5 valve circuit.<br />
• Check for refrigerant<br />
overcharging.<br />
• Check for defect in outdoor<br />
P.C. board (I/F).<br />
• Check power supply voltage.<br />
• Check outdoor fan system<br />
error.<br />
• Check heat sink cooling duct<br />
for clogging.<br />
• Check IGBT and heat sink for<br />
thermal performance for faulty<br />
installation.<br />
(e.g. mounting screws and<br />
thermal conductivity)<br />
• Check for defect in A3-IPDU.<br />
(faulty IGBT built-in<br />
temperature sensor (TH))<br />
• Check float switch connector.<br />
• Check operation of drain<br />
pump.<br />
• Check drain pump circuit.<br />
• Check drain pipe for clogging.<br />
• Check for defect in indoor<br />
P.C. board.<br />
• Check connection of fan<br />
connector and wiring.<br />
• Check for defect in fan motor.<br />
• Check for defect in indoor<br />
P.C. board.<br />
• Check impact of outside air<br />
treatment (OA).<br />
MG-CTT: Magnet contactor<br />
188
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