1301   Error: QP control (Feedback circuit) malfunction.

The V voltage of the QP cannot be controlled.

Check the V voltage of the QP and QP detector forward power, reflected RF power.

The following are the probable causes.

• 48V is not supplied (Cover is open).
• QP-related cabling came off.
• QP rod, or QP-related wiring (including the feedthrough and bridge cables) causes a short in other metallic parts.
• QP matching frequency is not appropriate.
• Faulty QP tank PCA (QP tank coil burn).
• Either the QP detector PCA (or QP RF PCA), QP tank PCA or QP controller PCA is faulty.
• Faulty DC power Supply.