Have a system with about 20 water source heat pumps on it and 2 of them are acting up. The 2 that are acting up are working fine in cooling and compressor cuts out in heating. One of the units was low on refrigerant. I reclaimed the system, checked for leaks, and weighed refrigerant back in. It ran fine until it was satisfied. Then it started cutting the compressor out on heat again. Some times it would cut out after 6 seconds and if I put it in cooling then back to heat it would run for at least 3 min. Any Ideas.