Do you have a EMS inline? When my circuit board for the Progressive Industries went out it did the same thing. Bypass the EMS, if hardwired there is a switch at the bottom of the monitor, if a plug in model, remove it. If you have an EMS see if it does the same thing when bypassed. If it does, the relay in the transfer switch is going bad.
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Chuck in SW FL
Digital 2021 Cornerstone "B"
A "Digital" 2019 Cornerstone "B" Traded
A "Classic" 2014 Anthem 42 RBQ---Sold
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