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Furnace Service - Voltage Fluctuations in Chatham, NJ

Voltage Fluctuations in Chatham, NJ
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Customer states boiler continues to make clicking thumping noise. Upon arrival set Nest thermostat to call for heat. 

During heating operation gas solenoid clicks and thump noise is created due to rapid power drops to solenoid. 

With meter found voltage fluctuations when heat is running. 

Bypassed nest thermostat at wall and solenoid receives constant voltage and no thumping or noises are created. 

Nest thermostat is the issue. After speaking with manufacturer , Manufacturer recommends to install Fast Stat common maker in these situations to address problem.