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Phason Support Forum » Frequently asked questions (FAQs) » All controls » Variable fan runs at maximum

Variable fan runs at maximum

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1 Variable fan runs at maximum on 2013-01-03, 2:40 pm

Possible cause

  1. Wiring incorrect
  2. Backup thermostat is overriding the control
  3. The minimum idle speed is too high.
  4. The On Full At / Range setting is the same as the temperature set point.
  5. Incorrect motor curve (Supra, PEC+, PEC, SEC-HD, TVS)


  1. Wire according to user manual
  2. Check backup thermostat setting
  3. Decrease minimum ventilation setting
  4. Increase On Full At / Range setting or decrease Temperature Setpoint
  5. Choose a different motor curve

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