After-Sales Service for Hengjunfeng (HJF) Chargers
1-year free warranty, and lifetime maintenance service is available after the warranty expires.
Its sub-brand Chengdian Xinsheng adopts the identical after-sales service system. I. Free Services Within Warranty Period
1. Free repair and component replacement For factory quality defects of the charger including internal components, circuits, MCU control modules and other parts, free repair service will be provided.
Damaged core components will be replaced free of charge. If the unit suffers severe damage beyond repair, replacement of a new unit can be negotiated.
> Note: On-site repair service is generally unavailable for individual retail customers; defective units shall mostly be shipped back to the factory for maintenance. For clients purchasing large batches of equipment, remote guidance or on-site service can be stipulated in the contract.
2. 7×24-hour remote technical support We provide technical consultation, parameter debugging, battery matching troubleshooting, wiring guidance and fault code diagnosis via phone, WeChat and email, to quickly identify whether the fault lies with the charger or the battery BMS.
3. Technical documents and debugging support We supply charging parameter specifications and wiring diagrams. For customized models with abnormal parameters, we offer remote assistance to adjust charging curves. Basic operation training is available for bulk-order clients.
4. Maintenance turnaround time Once the faulty unit is received and inspected, repair and return will generally be completed within 3 to 7 working days. > Shipping fee policy: For regular retail customers,
each party bears one-way shipping cost when sending units to and from the factory. For bulk B-end orders, shipping cost liability can be agreed upon in the contract.
II. Lifetime Maintenance Service After Warranty Expiry 1. Only component material cost plus a nominal labor fee will be charged; no high full-unit replacement fee applies. 2. Remote fault diagnosis technical support remains accessible at all times. 3. If spare parts for outdated models are discontinued, alternative modification solutions will be offered.
III. Scenarios Excluded from Free Warranty (All Services Chargeable) 1. Unauthorized disassembly, refitting or modification of internal circuits; 2. Burnout caused by mismatched battery voltage, reversed positive/negative poles or abnormal mains input voltage; 3. Man-made damage such as water ingress, excessive dust accumulation, impact and casing breakage; 4. Damage from bumps during transportation; 5. Damage caused by natural disasters; 6. Units with serial numbers or labels torn off, altered and untraceable.
IV. Special Reminders for Individual Retail Buyers 1. If purchased through distributors or second-hand vendors, please contact the dealer for after-sales service first. Direct factory warranty service is only available for units purchased directly from Hengjunfeng. No warranty coverage applies to second-hand units. 2. Unlike consumer digital products, our industrial chargers have no offline physical service outlets nationwide; all maintenance work is processed at our factory in Shenzhen. 3. For key projects during procurement, warranty term, shipping cost liability and maintenance cycle are recommended to be specified in the purchase contract; verbal commitments shall not be recognized.
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Tel: +86-18924633187
Email: rd11@hjf-tech.com
