The V voltage of the QP1 cannot be controlled.
Check the V voltage of the QP1 and QP1 Fader voltage.
The following causes are inferred.
S24V is not supplied (Cover is open).
QP1-related cabling came off.
QP1 rod, or QP1-related wiring (including the vacuum chamber) causes a short in other metallic parts.
QP1 matching frequency is not appropriate.
Faulty QP1 Tank PCA (QP1 tank coil burn).
Either the QP1 RF PCA, QP1 Tank PCA or QP1 Controller PCA is faulty.
Faulty DC power Supply.