Friedrich MRM09Y1J, Service & Parts Manual

Page: 85 / 135

85 PB
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
13 indoor
evaporator
temperature
sensor is
open/ short
circuted
F2 OFF 3s
and blink
twice
AC stops operation once
reaches the setting tem
-
perature. Cooling, drying:
internal fan motor stops
operation while other loads
stop operation; heating: AC
stop operation
1.Loosening or bad contact
of Indoor
evaporator temp. sensor
and mainboard terminal.
2.Components on the
mainboard fall down leads
short circuit
3.Indoor evaporator temp.
sensor damaged.(check
temp. sensor value
chart for testing)
4.Mainboard damaged.
14 outdoor
ambient
temperature
sensor is
open/ short
circuted
F3 OFF 3s
and blink
3 times
OFF 1s
and blink
6 times
During cooling and drying
operating, compressor
stops while indoor fan
operates; During heating
operation, the complete unit
will stop operation Outdoor temperature sen -
sor hasnt’ been connected
well or
is damaged. Please check
it by referring to the resis
-
tance table for temperature
sensor)
15 outdoor
condenser
temperature
sensor is
open/ short
circuted
F4 OFF 3s
and blink
4 times
OFF 1s
and blink
5 times
During cooling and drying
operation, compressor
stops while indoor fan will
operate; During heating
operation, the complete unit
will stop operation. Outdoor temperature sen -
sor hasnt been connected
well or
is damaged. Please check
it by referring to the resis
-
tance table for temperature
sensor
16 outdoor
discharge
temperature
sensor is
open/ short
circuted
F5 OFF 3s
and blink
for 5
times
OFF 1S
and blink
7 times
During cooling and drying
operation, compressor
will sop after operating for
about 3 mins,
while indoor fan will
operate; During heating
operation, the complete unit
will stop after operating for
about 3 mins.
1. Outdoor temperature
sensor hasnt been con
-
nected well or is damaged.
Please check it by referring
to the resistance table for
temperature sensor
2. The head of temperature
sensor hasnt been inserted
into the copper tube
17 limit/
decrease
frequency
due to
overload
F6 OFF 3s
and blink
for 6
times
OFF 1s
and blink
3 times
All loads operate normally,
while
operation frequency for
compressor is decreased
Refer to the malfunction
analysis (overload, high
temperature resistant)
TROUBLESHOOTING
Diagnostic Codes