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Checked no cooling on climatmaster geo heat pump, found low voltage breaker tripped. Reset and found low resistance to ground. Checked pressure switches found all normal. Found cxm board fast flash on diagnostic light. Retry between lockout. Checked lockout history and found no lockouts. Bypassed time delay and heat pump started and ran. After about 30 minutes of running the cxm board cycled off and again flashed that the control was in retry mode after lockout, still no lockout in history. Need to replace cxm control board. Need cxm control board part # 17B0001N04C