Reply to "MTH Z 500 Transformer has constant 18 Volt output."

Jon GOGR Forum Member SUPPORTING MEMBER

90 percent of the failures in a Z-Controller is a failed (shorted) TVS. You can clip one lead and see if voltage control is restored. If so, replace the TVS. A spike in voltage usually takes them out. It's the Diode shaped device bridging the two silver pads at the bottom of GunnrunnerJohn's photo.

3/4/217:45 PM

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