05 Sep 2010 
Support Center » Troubleshooter » Heating Problems/Z Model/Duplex System
Heating Problems/Z Model/Duplex System
Trouble shooting a Z model spa, with 1 or 2 pumps and the H139000 Duplex control, that is not heating. (The Duplex control has a knob to adjust temperature, 1 button to control the various modes and a heat indicator lite.) Applies to 115V & 230V units.

Options
 Place the unit in filter heater mode and make sure the pump is running and the heater light is on steady (not flashing).

   

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 Category List
 Heating Problems/Z Model/Duplex System
 Heat Indicator Lite is flashing on a Z Model Spa with a Duplex System and the Unit will not turn on.
 Heat Indicator Lite is flashing on a Z Model Spa with a Duplex System and the pump is running.
 Display shows "OH" Message on a Spa with a Digital System
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