Web Reference: “b1” Code stands for “Ignition Control Board (ICB) data error”. If the ICB does not satisfy self-diagnostic on power up or initial trial for ignition, the ICB will lock out until error condition is corrected. Jun 11, 2022 · A1 - Air switch circuit open before ignitor warm-up: Differential Pressure Switch open when expected closed. This code indicatesthe switch circuit never closed when the blower turned on or reopened within 10 seconds of the blower starting. May 11, 2022 · This error code will appear on your screen when the igniter is open. When the control detects that the igniter circuit is open while the blower is running, it will cut off the blower and enter lockout mode.
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