Recent content by pauldscott

  1. P

    Pentair MasterTemp 400 cycles on and off

    Ok I had this problem and the high limit switch HLS LED on I googled the issue and watched a few YouTube videos and bought a new HLS and a new Manifold By-pass valve. I worked on it today and the problem is the thermostat not the HLS or Manifold by-pass valve. The HLS is a normally closed 135...