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400 Circuit Board (direct replacement of 6600-031 & 1992 600 models)
600 Circuit Board (6UR 120) replaces 601 - 605 series boards. Includes a calibrated temperature sensor. If you are replacing a 601 or 602 board, you also need the Diehl Timer Retrofit Kit.
624 Circuit Board (6U2 240). Includes a calibrated temperature sensor.
**This item has been discontinued**
701 / 724 Series Circuit Board
**This item has been discontinued**
Diehl Timer Retro Kit (for 601 & 602 boards)
**This item has been discontinued**


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