Trying to replace a Rainbird CRC-8 with a Rainbird ISM-9. The ISM does not seem to operate the valves. I have voltage at the valves, and can hear them (or one of them) click when the voltage is applied, but no water. The CRC-8 had wires connected to the "com" terminal, and stations 1-8. I transferred the wires to the corresponding ISM terminals. I've tried Rainbird's Tech Line, but all they can tell me is the two controllers are compatible. Does anyone have any suggestions?