mitsubishi msz-ga35va ac indoor unit

[morg]

Hi.
Operation light is constantly flashing on indoor unit. No definate sequence, just flasing constant. On start up fan motor operates for couple of minutes then stops and operation light flashes.? Any opinions appreciated.
Thanks

[install monkey]

limit switches on the louvres

[install monkey]

POWER lamp Abnormal point
(Failure mode) Condition Correspondence
Not lighted Normal — —
1-time fl ash every
0.5-second
Room temperature
thermistor
The room temperature thermistor short or
open circuit is detected every 8 seconds during
operation.
Refer to the characteristics of the room temperature
thermistor (10-7.).
2-time fl ash
2.5-second OFF
Indoor coil
thermistor
The indoor coil thermistor short or open circuit
is detected every 8 seconds during operation.
Refer to the characteristics of the main indoor coil thermistor,
the sub indoor coil thermistor (10-7.).
3-time fl ash
2.5-second OFF Serial signal The serial signal from outdoor unit is not received
for a maximum of 6 minutes.
Refer to 10-6. "How to check miswiring and serial
signal error".
11-time fl ash
2.5-second OFF Indoor fan motor
The rotational frequency feedback signal is not
emitted during the 12 seconds the indoor fan
operation.
Refer to 10-6. "Check of indoor fan motor".
12-time fl ash
2.5-second OFF
Indoor control
system
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
Replace the indoor electronic control P.C. board.

[install monkey]

http://www.mediafire.com/view/43cdf243g1lbfdq/MUZ-GE25-71VA%20outdoor_Service_Manual_(OBH516revC).pdf

[morg]

Room temperature thermistor failure.
replaced and back in operation.
cheers