Recent content by 1stpoolmastertemp400

  1. 1

    Mastertemp400 cycling in spa mode

    Okay so today I took out the thermal regulator and am currently running the heater without it in. Same issue gets to about 88 degrees and starts to cycle. Replaced stack flue sensor Replaced high limit sensor Have tested the thermal regulator should I test the internal and external bypass...
  2. 1

    Mastertemp400 cycling in spa mode

    Hey experts, When I turn my mastertemp 400 onto spa mode. It will run for about a minute then turn on a HLS error light. After maybe two minutes light will go off and it will go through the same process again. This issue first started with an E05 error message. I came to this forum to start...