York YHKMXH009BARX-FX, Service Manual, Page: 246 / 269

PRODUCT DIAGNOSIS PROCEDURE
Malfunction Code
Diagnosis
Malfunction Code
Diagnosis
21
20 23
18
Module operated overload Module low or high voltage
IPM overcurrent or short circuit
Communication failure between Module and ECU
Module current detect circuit malfunction
MCU reset
Discharging temperature overheating.Lack of refrigerant, ambient temperature too high or PMVs blocked.
17
Malfunction of gas pipe temp. sensor for indoor unit A
Malfunction of gas pipe temp. sensor for indoor unit C
Malfunction of gas pipe temp. sensor for indoor unit D Malfunction of gas pipe temp. sensor for indoor unit E
Malfunction of liquid pipe temp. sensor for indoor unit A Malfunction of liquid pipe temp. sensor for indoor unit B
Malfunction of liquid pipe temp. sensor for indoor unit C
Malfunction of liquid pipe temp. sensor for indoor unit D
9
10 11 12
13 15
1 2 4 5 6
Malfunction of the DC fan motor
Malfunction of defrosting temp. sensor
Malfunction of compressor suction temp. sensor
Malfunction of ambient temp. sensor Malfunction of compressor discharge temp. sensor
Malfunction of condensing temp. sensor
Malfunction of liquid pipe temp. sensor for indoor unit E Malfunction of
‘
Toci
’
temp. sensor
System low pressure switch of
f
System low pressure protection.Refrigerant shortage, Low defrosting temp., or malfunction of fan motor
.
Faulty of outdoor unit EEPROM
Compressor start failure
Module input overcurrent
Diagnosis using the Numeral Light Indicator
0150514517
Precautions
For Adding Refrigerant
This system must use refrigerant R410A.
1. 2.Add refrigerant 28g/meter when the
total piping length exceeds the standard value
，
but make sure that the total liquid
piping length should be less than the max value.
System high pressure switch of
f
8
System high pressure protection.Refrigerant overabundance,High condensing temp. or malfunction of fan motor
.
Notes:
1.When using this product,you need not to set the address.But the L/N wires between indoor & outdoor units must be corresponded,or there will be communication failure. 2.Quiet Operation Setting.Set the DIP
”8”
to ON position of SW5,the system will run with lower noise,but the max capacity will also reduce slightly
.
3.Do NOT
change the settings of other
switchs,wrong settings can make the system damage or other malfunctions. 4.For some malfunctions, this system can make back up running.
*
ECU:Electronic Control Unit
*
MCU:Micro Control Unit
*
PMV
:Pulse Modulated V
alve
State when out of factory (Normal Operating)
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
OFF
1
2
3
4
Definition
Compulsive Heating:Frequenc
y 50HZ; PMV
200 pulse;Class 5 of outdoor fan motor
.
Rated Operating
Compulsive Cooling:Frequenc
y 60HZ; PMV
200 pulse;Class 7 of outdoor fan motor
.
Definition of SW1 on Malfunction Display
Module thermal overload
24 25
26
27 28 29
4-way valve switching failure
Loss of synchronism detection
30
31 32
34
35
36
39 40
Indoor thermal overload
Indoor frosted
41 42 43 44
45
38
Malfunction of module temp.sensor Momentary power failure detection
Malfunction of gas pipe temp. sensor for indoor unit B
33
16
Communication failure between indoor&outdoor unit Lac
k
of
re
fri
ge
ran
t o
r d
isc
ha
rg
ing
BTU
Std. V
alue
Max V
alue
40m
100m
ON
OFF
OFF
OFF
Time Defrost V
alid
45000
YJU5YH0 45 BARXA-X
244