TORONTO -- The union representing Ontario's English elementary school teachers says it has plans to ramp up its job action on Monday unless it reaches a deal with the province.

A spokeswoman for the Elementary Teachers Federation of Ontario says the union's members are also threatening to begin rotating strikes in October if the province doesn't return to the bargaining table.

The plan was announced Friday, hours before the union representing English high school teachers said it had ratified the agreement reached last month.

"Our members may have ratified this deal, but they remain frustrated and angry that the school boards of this province... were so brazenly determined to gut our collective agreements and to attack our working conditions," said Paul Elliott, president of the Ontario Secondary School Teachers' Federation.

The ETFO is now the only teachers' union that hasn't reached an agreement. Its teachers have been working without a contract since last year.

Talks between the union, the Ontario government and public school boards broke down last week. Premier Kathleen Wynne says it's up to the union to explain why it won't accept an offer that was similar to that reached with two other teachers' unions.

Agreements reached in August with the Ontario Secondary School Teachers' Federation and the Ontario English Catholic Teachers' Association contain raises of 1.5 per cent plus another one-per-cent bonus. The Catholic teachers have also ratified their agreement.

A tentative deal was reached earlier this week with the province's French elementary and secondary school teachers, though details of the agreement have not been released. Union members have until Oct. 16 to ratify it.

"It is disappointing to hear that ETFO is escalating job action and that the withdrawal of services will further disrupt students' learning in the classroom," Education Minister Liz Sandals said in a statement.

"We are confident that an agreement can be reached within the parameters presented to ETFO and we are prepared to resume discussions on that basis."

The opposition parties said the stalled negotiations are leaving children and parents in the lurch and urged the government to get back to the bargaining table.

"Across the province, parents have been sharing their worries that they won't be able to find daycare options if their children aren't in the classroom. The Liberals need to get back to the bargaining table and get a deal done for the sake of students and parents," said Patrick Brown, leader of the Progressive Conservatives.

Added NDP education critic Lisa Gretzky: "The premier has a responsibility to ensure that working conditions in our elementary schools are healthy for educators and students alike. These take it or leave it bargaining tactics will leave our schools in chaos and put student learning conditions in jeopardy."