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Eurotherm 2704 Dual DC Output Module!

I had a problem on my eurotherm 2704, during night shift it giving an alarm on sensor break (as per operation). When I came in morning, equipment was stopped and tried to run it again but failed.
I'm using the controller on ladle preheating. The Dual DC Output Module controls two positioner valve. One for the gas and the other for the air.
I have problem on my air valve which 4-20mA was connected on 1C and 1D.
When I started the burner, normally the air valve should open 30%, but nothing happens.
Can someone enlighten me on this one? Is there any safety latched or program hold?
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