Problem Description:

Pressurization cylinder lowering no fast speed.

Troubleshooting Steps:
– On-site test: pressurization lift normal.
– Lowering speed sluggish.
– Manually actuated lowering combined flow solenoid; restored normal.
– Visual check found coil no magnetism, low resistance.
– Restored normal.

Root Cause:

To be followed up.

Required Parts:

Replaced with spare coil.