ESP‑6TM Shows “PR OFF” After Fuse and Battery Replacement

Controller displays “PR OFF” despite new fuse and 3 V battery.

Measure voltage on the two far‑left terminals marked “24 VAC” (transformer input to board).
Should be 23‑26 VAC. If low, transformer is bad.
If voltage is good, the microprocessor is likely failed – replace controller.

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