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5 year old geothermal system water wil not shut off after heating cycle

in Geothermal
I just discovered the water runs continuously after a heat cycle. if I turn geo off the water will turn off normally. when turned back on the water will ramp up normally in about 1 minute, then the geo fires up about 4 minutes later. BUT, when cycle is finished the geo shuts down normal, and the water continues to flow. My light bill last month was $400! I suspect the taco valve on the incoming water supply. Any suggestions?
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Gary
Wilson Services, Inc
Northampton, MA
www.wilsonph.com
[email protected]
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