Fisher FSMED-124HFPL, Technical & Service Manual

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10.3.3 Failure phenomenon
Failure phenomenon Operation lamp Timer lamp
Indoor fan speed has been out of control for over 1 minute
☆
X
Indoor room temp. or evaporator sensor is open circuit or short circuit ☆ On
Over current protection of the compressor occurs 4 times X ☆
EEROM error On
☆
No over-zero signal
☆ ☆
r Extinguish
☆
Flash at 5Hz
10.3.3.1 Operation lamp flashes and Timer lamp off.
23
Is connector connection good?
Yes
No
Indoor PCB is defective
Repair the connector
Yes
Fan motor is defective
Is voltage being applied to the fan motor?
No
10.3.3.2 Operation lamp flashes and Timer lamp on.
Yes
Replace the sensor
Is connection to connector good?
No
Repair connector
10.3.3.3 Operation lamp off and Timer lamp flashes
Operation lamp off and Timer lamp flashes
No Yes
Yes No
Indoor PCB is defective
After changing the main control board, check if the failure releases .
Power supply fault Outdoor unit fault (such as the compressor)
The voltage of power supply is too low (less than 187V)?
Yes
10.3.3.4 Operation lamp on and Timer lamp flashes
EEROM error, indoor PCB is defective.
10.3.3.5 Operation lamp flashes, Timer lamp flashes .
This is alarm signal when the main chip can’t detect over-zero signal. When such failure occurs, the main
control board must have fault.