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Bard part 8201-168 is an OEM Water Modulation Control PCB used on Bard equipment with water modulation capability to manage the control signal that regulates water flow for stable capacity and temperature control. When this board fails, you can see poor water flow control, nuisance shutdowns, or inconsistent leaving-air performance, so replacing it with the correct Bard OEM board helps restore proper modulation and reliable operation. Because this is a control board, confirm the exact unit model and serial number compatibility before ordering and transfer any settings or wiring exactly as found during installation.