Machine Alarms Haitian Code E77

Haitian Error E77: Injection Pressure Sensor Malfunction

Tensile data verified against MatWeb.com database & manufacturer datasheets · Last updated July 2026

Published: 2026-07-03

Quick Reference

Haitian E77 indicates the injection pressure sensor is returning implausible values. Check wiring and verify with calibrated gauge.

Check Controller Diagnostics

Identify which zone/component triggered the alarm. Record error code and timestamp.

Visual Inspection (LOTO First)

Power down, lock out, inspect affected component for damage or leakage.

Electrical Testing

Test resistance/continuity with multimeter. Verify SSR and fuse integrity.

Replace Faulty Component

Use OEM-approved part. Document replacement in machine log.

Verify and Document

Restart, test cycle, verify alarm cleared, log root cause and repair.

Equivalent / Alternate	Action
Engel Alarm 510

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ASTM International. Standard Specifications for Engineering Plastics & Thermoplastics. astm.org
UL Prospector. Plastics & Elastomers Material Database. ulprospector.com
MatWeb. Material Property Data for Engineering Thermoplastics. matweb.com
ISO 1043. Plastics — Symbols and Abbreviated Terms. iso.org