Yaskawa GA800 E32 Fault — What It Means
The E32 fault on a Yaskawa GA800 variable frequency drive indicates a soft-charge bypass relay answerback fault. During startup, the drive commands the soft-charge bypass relay to change state and monitors a feedback signal to confirm the relay responded correctly. When E32 appears, the drive did not receive the expected relay-state feedback from the DC bus precharge or bypass circuit. This is not a motor overload or output short. It is a precharge relay feedback problem specific to the drive’s internal startup sequence. The drive expects confirmation that the relay closed or opened as commanded, and that signal was missing or incorrect.
Common Causes
- Worn or failed soft-charge bypass relay The relay or contactor in the precharge bypass circuit has reached end-of-life and no longer switches reliably, preventing proper feedback.
- Control board failure The board that drives the relay or interprets the feedback signal has developed a fault, causing incorrect answerback detection.
- Loose or damaged relay feedback wiring Connections or circuit paths between the relay and the control board are loose, corroded, or heat-damaged, interrupting the feedback signal.
- High relay maintenance counter Parameter U4-06 (precharge relay maintenance counter) may indicate the relay is near replacement cycle, though the exact threshold should be verified in the drive documentation.
- Drive internal circuit failure When the relay circuit is not field-serviceable, the entire drive assembly may have failed and require full replacement.
Step-by-Step Fix
- Power down completely, lock out, and tag the disconnect for the VFD before opening any enclosure or inspecting internal components.
- Inspect all control and relay wiring for loose connectors, signs of overheating, and visible damage to the relay or control board areas.
- Re-energize the drive once to verify whether the fault is persistent or intermittent, then immediately power down again for safety.
- Check parameter U4-06 (precharge relay maintenance counter) if accessible, and note any high-hour or end-of-life indication for the soft-charge relay.
- Inspect the soft-charge bypass relay or contactor for physical wear, pitting on contacts, or failure to actuate, and replace if accessible and visibly degraded.
- Replace the control board if the relay tests good but feedback signal paths appear faulty, or if the fault persists after relay replacement.
- Contact Yaskawa support with model number, serial number, fault code, application details, and time in service if the fault is not resolved by field-replaceable parts or if the drive requires factory repair.
Parts Often Needed
| Part | Notes |
|---|---|
| Yaskawa GA800 soft-charge bypass relay | Amazon | Precharge circuit relay, confirm part number for your drive frame size |
| Yaskawa GA800 control board | Amazon | Replacement board for relay drive and feedback circuits, specify drive model |
| Replacement Yaskawa GA800 VFD | Amazon | If relay circuit is not field-serviceable or multiple internal faults exist |
When to Call a Pro
Call a qualified VFD service technician or contact Yaskawa technical support if you are not trained in high-voltage industrial drive repair, if the fault persists after inspecting wiring and connections, or if you do not have access to the drive’s internal relay and control board assemblies. Precharge circuits operate at DC bus voltages and require proper lockout, discharge, and measurement procedures. If the drive is mission-critical or under warranty, professional diagnosis and factory-authorized parts will prevent further damage and make sure safe restoration of operation.