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View cart Proceed to checkoutCompadible models: All 3 Key BioSmart Heaters"Power-up-Down" version
Compatible models: All BioSmart portable heaters prior to 2011 with 7 key control panels including PA with UV rocker switch on the back.Includes thermostat sensor.
Compatible models: All BioSmart 7 key PA, On-Wall, and In-Wall units after 2011.
Compatible models: All BioSmart 6 key heaters.Includes thermostat wire. Requires conversion kit on models with older boards with external transformer.
Replaces the old Ao4 and Ao5 PC boards on ComfortZone heaters. ComfortZone heaters will need an upgrade kit since this board includes the transformer. ComfortZone heaters with DC fans have the older AO4 board and will need the more complicated DC fan upgrade kit.Includes thermostat wire.