Fisher FSMED-124HFPL, Техническое и сервисное руководство

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10.3 Diagnostic Chart
10.3.1 After energizing, no indicator is lighted and the air conditioner can’t be operated.
After energizing, the air conditioner can’t be operated
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Check if AC220V power supply outputs to Indoor PCB.
Yes
Yes No
No Yes
Yes
No
Check if AC220V exists at the primary coil of transformer.
Indoor PCB is defective
Check if AC14.5V exists at the secondary coil of transformer.
Take off the secondary plug of transformer, and then check if
AC14.5V exists at the secondary coil of transformer.
The transformer is defective. Indoor PCB is defective
10.3.2 Resetting phenomenon often occurs during operation. (That is automatically entering to the status
when power is on.)
The reason is that the instantaneous voltage of main chip is less than 4.5V. Check according to the following procedure:
Yes
Resetting phenomenon often occurs during operation.
No Yes
After changing Indoor PCB, check if the failure releases .
No
After changing indoor fan motor, check if the failure releases .
Indoor PCB is defective
Power supply circuit has problems.