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Bard part number 8201-136BX is an OEM Completestat relay supplied boxed for service replacement, used in Bard wall-mounted HVAC equipment to switch low-voltage control circuits so the unit can respond correctly to thermostat and safeties during heating or cooling operation. Replacing a weak or intermittent relay can resolve issues like erratic starts, nuisance shutoffs, or controls that do not consistently energize the next component in sequence. Because control layouts vary by model and vintage, confirm the exact relay location and wiring by matching 8201-136BX to your Bard unit wiring diagram or parts list before ordering.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.