We have a Jandy VS pump and Jandy NG heater both 2 yrs old. About a month ago I noticed that the heater would shut off after a few minutes showing error message to check flow rate. The pump usually runs at the default speed of 1750. If I increase the speed to 2750 the next setting the heater works fine. We backwashed the DE filter even though the pressure had not increased significantly but the problem persists. The pool plumber asked that I run the pump at 2600 for 12 hrs and see if the pressure changes. It didn’t. He said all was well and to run the pump at 2600 routinely as he thinks 1750 is too low. We have a Jandy SWG and all chemicals are in range. Any thoughts would be appreciated.