Allen-Bradley PowerFlex 4M VFD
Allen-Bradley PowerFlex 4M VFD code F038: F038 Phase U to Gnd
The drive shut down because it detected a phase to ground fault on the U phase going to the motor.
Safety first. This code involves a gas, flame or electrical hazard. Do not keep resetting it. Leave burner, gas train and high voltage work to a qualified technician. WERCS answers 24/7 at (877) 489-3727.
- Code
- F038
- Name
- F038 Phase U to Gnd
- Controller
- Allen-Bradley PowerFlex 4M VFD
- Type
- Ground fault
- What it does
- Fault: the equipment trips and stops
- Risk
- RED Specialist territory
- Reset
- Needs a manual reset
- Source
- The manufacturer's manual (subscribers see which manual and page)
Updated July 22, 2026
How to fix it
Subscribers get:
- What to do next, in plain words
- Which manufacturer manual it comes from, linked
- The 4 common causes listed for this code
- The step by step check for this problem, one check at a time
- Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
Questions about this code
What does Allen-Bradley PowerFlex 4M VFD code F038 mean?
The drive shut down because it detected a phase to ground fault on the U phase going to the motor.
Is Allen-Bradley PowerFlex 4M VFD code F038 dangerous?
It is graded red, specialist territory: it involves a burner, gas, flame or safety lockout, so leave the repair to a qualified technician.
How do I fix Allen-Bradley PowerFlex 4M VFD code F038?
The manual's fix and the step by step check for this code are in WERCS Diagnose, plans from $49 a month. For help right now, WERCS answers 24/7 at (877) 489-3727.
Other Allen-Bradley PowerFlex 4M VFD codes
F007 · F007 Motor OverloadF008 · F008 Heatsink OvrTmpF012 · F012 HW OverCurrentF013 · F013 Ground FaultF041 · F041 Phase UV ShortF063 · F063 SW OverCurrentF064 · F064 Drive OverloadF070 · F070 Power UnitF081 · F081 Comm LossF100 · F100 Parameter Checksum
All 15 Allen-Bradley PowerFlex 4M VFD codes · Every fault code