Error contents – Friedrich MW18Y3F User Manual
Page 11
Self-diagnosis function table (Flashing LED Display)
* Detailed Trouble Display (secondary level) can be indicated by pressing Test Operation button.
ERROR CONTENTS
Error
Operation
Timer
Error
Operation
Timer
Serial signal
error
Normal
1 sec
blinking
Serial reverse signal error
at operation start up
0.1sec
blinking
0.5sec
2 times
When a signal is not read continuously for 10 secs
from power relay ON immediately after operation starts
>>Cooling 0 code transmission, automatic reset
When a signal is not read for 20 secs thereafter
>>Trouble display continues and power relay OFF
>>Permanent stop
When a signal is not read continuously for 10 secs
from power relay ON immediately after operation starts
>>Cooling 0 code transmission, automatic reset
When a signal is not read for 20 secs thereafter
>>Trouble display continues and power relay OFF
>>Permanent stop
Signal reverse signal error
during operation
0.1sec
blinking
0.5sec
2 times
Serial forward signal error
at operation start up
0.1sec
blinking
0.1sec
blinking
0.1sec
blinking
0.1sec
blinking
0.1sec
blinking
0.1sec
blinking
0.1sec
blinking
0.1sec
blinking
0.1sec
blinking
0.1sec
blinking
0.5 sec
4 times
Normal Serial Forward Signal can not be
received more than 10 secs
>>Releases when it becomes normal
Serial forward signal error
during operation
0.5sec
5 times
Normal Serial Forward Signal can not be
received more than 10 secs ( after receiving
effective forward transfer signal)
>>Releases when it becomes normal
Indoor unit
thermistor
error
0.5sec
2 times
0.1sec
blinking
Indoor temperature
thermistor open
0.5sec
2 times
Thermistor detection value is open when
AC plug is inserted
>>Releases when value becomes normal
Pipe thermistor
open or short
0.5sec
3 times
Thermistor detection value is open or short
when AC plug is inserted
>>Releases
when value becomes normal
Outdoor unit
thermistor
error
0.5sec
3 times
0.1sec
blinking
Discharge thermistor
open or short
0.5sec
2 times
Thermistor detection value is open or short
>>Outdoor unit stops
Releases when it becomes normal
Heat exchanger
thermistor open
0.5sec
3 times
Thermistor detection value is open
>>Outdoor unit stops
Releases when it becomes normal
Outdoor temperature
thermistor open or short
0.5sec
4 times
Thermistor detection value is open or short
>>Outdoor unit stops
Releases when it becomes normal
Indoor unit
control error
0.5sec
4 times
0.1sec
blinking
Forced automatic SW
welded
0.5sec
2 times
Forced Auto SW is ON for more than
10 secs continuously
>>Error is indicated while it is ON
Normal Operation other than error indication
Main relay welded
0.5sec
3 times
Serial Reverse Signal is received 1 min.
after Main relay becomes OFF
>>Error is indicated while serial reverse
signal is input on normal operation
Normal operation except error indication
Power interruption error
0.5sec
4 times
50/60Hz is not detected after 4 secs of
power ON.
>>Error is indicated and unit is stopped
Trouble Display (primary)
Detailed Trouble Display (by Test Button)
Detailed Error Item
In
do
or
In
do
or
In
do
or
In
do
or
In
do
or
O
ut
do
or
O
ut
do
or
O
ut
do
or
Model : MW18Y3F / MR18Y3F
2006.02.20
10