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I have connected dallas temperature sensor with FMA120.

It frequently gives 3000 with Dallas Temperature ID 0 and also it gives proper readings after reset sometimes.

But this problem is occurring again and again.

Please guide.

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If you have long sensor wiring, you may need to connect pull-up resistor between sensor +V and data. My experience is that with 2 sensors the wiring can be 10-15 meters long, with three sensors reaching that distance needs pull-up resistor (about 2k-5k) to be connected.
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Hi there, would you mind show me a sample of how you connect the pullup resistor?