Friedrich MRM09Y1J Service & Parts Manual

90 PB
TROUBLESHOOTING
Diagnostic Codes
No. Malfunction
Name
Display Method of Indoor Unit Display Method of Outdoor Unit A/C status Possible Causes
Dual-8
Code
Display
Indicator Display (During blinking,
ON 0.5s and OFF 0.5s)
Indicator has 3 kinds of display
status and during blinking, ON
0.5s and OFF 0.5s
Power
Indicator
Cool
Indica-
tor
Heating
Indicator
Yellow
Indicator
Red Indi-
cator
Green
Indicator
44 malfunction
of phase
current
detection
circuit for
compressor
U1 OFF 3s
and blink
13 times
During cooling and drying
operation, compressor will
stop while indoor fan will
operate; During heating
operation, the complete unit
will stop
Replace outdoor control
panel AP1
45 malfunction
of voltage
dropping for
DC bus bar
U3 OFF 3s
and blink
20 times
During cooling and drying
operation, compressor will
stop while indoor fan will
operate; During heating
operation, the complete unit
will stop
Supply voltage is unstable
46 malfunction
of complete
units current
detention
U5 OFF 3s
and blink
13 times
During cooling and drying
operation, the compressor
will stop while indoor fan
will operate;
During heating operating,
the complete unit will stop
operation.
There’s a circuit malfunc-
tion on outdoor units
control panel AP1, replace
the outdoor units control
panel AP1.
47 the four-way
valve is
abnormal
U7 OFF 3s
and blink
20 times
If this malfunction occurs
during heating operation,
the complete unit will stop
operation.
1.Supply voltage is lower
than AC175V;
2.Wiring terminal 4V is
loosened or broken;
3.4V is damaged, please
replace 4V.
48 zero
crossing
malfunction
of outdoor
unit
U9 OFF 3s
and blink
18 times
During cooling operation,
compressor will stop while
indoor fan will operate; dur-
ing heating,the complete
unit will stop operation.
Replace outdoor control
panel AP1
49 frequency
limiting
(power)
OFF 1 and
blink 13
times
50 compres-
sor running
OFF 1s
and blink
13 times
51 the tem-
perature
for turning
on the unit
is reached
OFF 1s
and blink
8 times
52 frequency
limiting
(module
tempera-
ture)
OFF 1s
and blink
11 times

Friedrich MRM09Y1J Specifications

General

Brand	Friedrich
Model	MRM09Y1J
Category	Air Conditioner
Language	English