T8D7 : No Temperature Rise Gun 4

To avoid serious injury follow all warnings and instructions in the manual. Wear appropriate personal protective equipment.

Check fuses F3 and F4 or F7 and F8 on MZLP that error channel is connected to.
Heated hose electrical connector or wires are defective. Check resistance of hose wiring. See hose manual for proper resistance range.
Defective heater rods in gun manifold. Replace gun manifold. NOTE: Defective heaters rods in the gun manifold can also cause the no current error.