Mitsubishi Electric Mr.Slim PUHZ-SHW80VHA Service Manual page 32

Error Code Abnormal point and detection method
Freezing/overheating protection is working
Overheating protection <Heating mode>
Abnormal if condensing temperature of
pressure sensor (63HS) detects
Tcond. : or more and compressor
operation frequency is less than or equal
to 25 Hz. Detection is inoperative during
defrosting.
P6
Tcond
stage-g
-18 -17
Pipe temperature
<Cooling mode>
Detected as abnormal when the pipe
temperature is not in the cooling range
3 minutes after compressor start and
6 minutes after the liquid or condenser/
evaporator pipe is out of cooling range.
Note 1) It takes at least 9 minutes to detect.
Note 2) Abnormality P8 is not detected in
drying mode.
Cooling range : Indoor pipe temperature
(TH2 or TH5) – room temperature
(TH1) [ -3 :
TH: Lower temperature between liquid pipe
temperature and condenser/evaporator
temperature
P8
<Heating mode>
When 10 seconds have passed after the
compressor starts operation and the hot
adjustment mode has finished, the unit is
detected as abnormal when condenser/
evaporator pipe temperature is not in
heating range within 20 minutes.
Note 3) It takes at least 27 minutes to
detect abnormality.
Note 4) It excludes the period of defrosting
(Detection restarts when defrosting
mode is over)
Heating range : 3 : [ (Condenser/
Evaporator temperature(TH5) –
room temperature(TH1))
OCH526
1 Overcharge of refrigerant
2 Defective refrigerant circuit
(clogs)
3 Malfunction of linear expansion valve
4 Reduced water flow
· Clogged filter
· Leakage of water
5 High temperature
· Over-load
· Inlet water is too warm.
6 Defective water pump
w 4~6 is in the case that the unit
is used as Air to water.
stage-e
stage-f
-15 -14 -12 -11
stage-a stage-b stage-c stage-d stage-e stage-f stage-g
Tcond
63 62
1 Slight temperature difference
between indoor room temperature
and pipe <liquid or condenser/
evaporator> temperature
thermistor
• Shortage of refrigerant
• Disconnected holder of
pipe <liquid or condenser/
evaporator> thermistor
• Defective refrigerant circuit
2 Converse connection of
extension pipe (on plural units
connection)
3 Converse wiring of indoor/
outdoor unit connecting wire (on
plural units connection)
4 Defective detection of indoor
room temperature and pipe
<condenser / evaporator>
temperature thermistor
5 Stop valve is not opened
completely.
Case
12 Check operating condition of refrigerant
3 Check linear expansion valve.
45 Check water piping.
6 Check water pump.
stage-c
stage-d
-9 -8 -6 -5
Ambient temperature (TH7)
61 60 59
1~4 Check pipe <liquid or condenser/evaporator>
Conduct temperature check with outdoor
(
controller circuit board after connecting
'A-Control Service Tool (PAC-SK52ST)'.
Temperature display of indoor liquid pipe
Indoor 1
1
Temperature display of indoor liquid pipe
Indoor 2
1
23 Check converse connection of extension
32
Judgment and action
circuit.
stage-a
stage-b
-3 -2
[ ]
57 51
temperature with room temperature display
on remote controller and outdoor controller
circuit board.
Pipe <liquid or condenser/ evaporator>
temperature display is indicated by setting
SW2 of outdoor controller circuit board as
follows.
Temperature display of indoor condenser/
evaporator pipe Indoor 1
2 3 4 5 6 1 2 3
ON
OFF
Temperature display of indoor condenser/
evaporator pipe Indoor 2
2 3 4 5 6 1 2 3
ON
OFF
A-Control Service Tool SW2 setting
pipe or converse wiring of indoor/outdoor
unit connecting wire.
)
4 5 6
ON
OFF
4 5 6
ON
OFF