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Found climate master geothermal system running when I arrived. Shorted outtest pins on cxm2 control board to recall fault history. Found it had a fault code 4 in the system. This can happen when the water loop temp becomes too low and sensor in coax coil shuts down system until loop temp rises. Found air filter was slightly dirty, ( replacement with one homeowner provided) recommended to homeowner that if this code would happen again we may need to increase water pressure in the geo loop with special needle fill system. Geo is working fine now with a 23 degree temperature rise. Geo water loop split is 6 degrees which is adequate.