Friedrich MRM09Y1J, Service & Parts Manual

Page: 84 / 135

84 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
9 Limit/
decrease
frequency
due to high
temperature EU OFF 3s
and blink
6 times
OFF 3s
and blink
6 times
All loads operate normally,
while
operation frequency for
compressor is decreased
Discharging after the com -
plete unit is de-energized
for 20mins, check whether
the thermal grease on IPM
Module of outdoor control
the radiator is inserted
tightly.
If its no use, please replace
control panel AP1.
10 Malfunction
protection of
jumper cap C5 OFF 3s
and blink
15 times
Wireless remote receiver
and button are effective, but
can not dispose the related
command 1.No jumper cap insert on
mainboard.
2.Incorrect insert of jumper
cap.
3.Jumper cap damaged.
4.Abnormal detecting
circuit of mainboard.
11 Gathering
Refrigerant F0 OFF 3s
and blink
once
OFF 3s
and blink
once
OFF 1s
and blink
17 times
When the outdoor unit
receive signal of Gathering
refrigerant ,the system
will be forced to run under
cooling mode for gathering
refrigerant
Nominal cooling mode
12 Indoor
ambient
temperature
sensor is
open/ short
circuited
F2 OFF 3s
and blink
once
During cooling and drying
operation, indoor unit
operates while other loads
will stop; during heating
operation, the complete unit
will stop operation. 1.Loosening or bad contact
of indoor ambient temp.
sensor and mainboard
terminal.
2.Components in main
-
board fell down leads short
circuit.
3.Indoor ambient temp.
sensor damaged.(check
with sensor resistance
value chart)
4.Mainboard damaged.