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Test BB1 - Code 21 Check Main Valve

  1. Disconnect main valve 2-pin plug. Using a volt/ohmmeter set at the 200-ohm scale, measure the resistance between pins No. 1 and 2.
  2. Resistance should be between 2-5.5 ohms. If not, replace main valve actuation assembly. If resistance is correct but service code still exists, check circuits No. 430E or 493 for open. Repair or replace as necessary.
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