•Air conditioner giant Gree charged long-time rival Aux of producing defective products on Monday afternoon

•Aux denied Gree's allegation and sued Gree on the same day

•The State Administration for Market Regulation, China's top market regulator, announced a probe on Tuesday

•Aux on Wednesday said all its products randomly checked passed the tests 100 percent in the past three years, and asked the market regulator to verify its products to clarify the matter

In response to long-term rival Gree's claim of Aux producing defective products, the company on Wednesday posted a statement on its official Sina Weibo account, saying that all the samples adhered to relevant standards in random checks carried out by market regulators from 2016-2019.

Aux air conditioners were involved in 29 checks and 19 related models were submitted to the checks, including one model which was accused by Gree of failing to meet the energy efficiency levels Aux claimed, according to the statement.

Aux said it has requested product tests by institutions designated by the State Administration for Market Regulation, so as to sooth consumers' concerns and clarify the matter.

When the tests are completed, results will be open to the public, the company said.

China's top market regulator is paying high attention to air-conditioner manufacturer Gree Electric's claim that its rival Aux Group was producing and selling defective products, and has informed the provincial level market regulator in Zhejiang to investigate and verify the allegation as soon as possible.

The regulator will make a disposition after probe and verification, and announce the result to the public in time, said the State Administration for Market Regulation on its website on Monday night.

Gree published a letter on its official Sina Weibo account on Monday afternoon, alleging that Aux's eight types of equipment's real energy efficiency was inconsistent with what it claimed on the label, which it said meant that the equipment burnt more energy than claimed.

Four hours later, Aux launched counterattack through its Weibo account, saying that Gree's reporting was unreasonable and defamatory launched ahead of the upcoming "618 shopping festival" as well as the peak season for air-conditioner sales.

The shopping festival, which runs for 18 days from June 1 every year, was created by e-commerce giant JD.com to celebrate its anniversary.

Aux citing All View Cloud, a consultancy firm, said its air-conditioner sales rose 56 percent year-on-year in the first quarter of this year, while Gree's sales fell 11.6 percent year-on-year.

Aux has reported the case to the public security and filed a lawsuit, the firm said.

On Monday night, Gree made a second announcement, saying it has prepared enough evidence for regulator to verify and will release the information depending on the situation.

Moreover, Gree announced eight inspection reports by Sichuan Institute of Electron Production Supervision & Inspection, and the report showed the samples were substandard. The eight samples were of Aux products made in Ningbo city, Zhejiang province.

However, the eight reports did not display the sampling location, sender and date, that the regulator would need to further confirm the reports.

Aux published its chairman Zheng Jianjiang's statement saying that it welcomed the supervision, and will co-build national brand reputation on quality.

Previously, China's three air-conditioner manufacturers — Gree, Midea and Aux — were involved in cases against each other, said the report.

Last year, Aux was ordered to pay 46 million yuan to Gree for violating intellectual property rights, according to Economic View's report on Tuesday.

The business portal also citing reports said Aux took improper ways to poach more than 300 members of Gree's R&D and quality inspection departments from 2010 to June, 2017.

Gree's chairwoman Dong Mingzhu was a vocal critic of Aux alleged stealing of Gree's technologies and cheating, said the Economic View.

In recent years, Aux's low price strategy threats Gree's leading role in air conditioner industry, according to the Economic View, citing industry insiders.