Philip Sclafani (l.), Jesus de la Cruz (c.) and Ayobami Ojedapo (r.) walk the picket line outside Charter Communications E. 23rd St. headquarters.

A federal mediator sat down with Spectrum workers Tuesday and employer Charter Communications as the two sides tried to come to an agreement to end the union’s strike, now in its third month.

But an accord didn’t seem likely, according to both parties.

A union member who was at the negotiations said the International Brotherhood of Electrical Workers Local 3 made an offer that included a financially significant concession.

Striking Spectrum workers from IBEW Local 3 pictured rallying on E. 23rd St. as they fight for a new contract.

But Charter Communications, the parent company of Spectrum-Time Warner Cable, declined the proposal, the union member said.

Roughly 1,800 Spectrum field and cable techs walked off the job 78 days ago over wage and discipline issues, as well as anger over Charter’s reluctance to keep paying into its health and pension funds.

The company called them “failing plans.”

A Charter spokesman on Tuesday declined to comment on the contract negotiations with the federal mediator.

The spokesman also declined to comment when asked if the company had refused to contribute to the existing IBEW pension and a health fund — as the union alleged.

City Controller Scott Stringer met with striking IBEW Local 3 members at the Charter/Spectrum payment center located at 2554 Broadway to show his support.

The company did release a general statement about its bargaining position.

“Charter is offering Local 3 a generous compensation package that includes an average 22% wage increase and comprehensive retirement and health benefits, including a 401(k) that provides a dollar-for-dollar match up to 6% of eligible pay,” the statement said.

“This competitive offer will have a positive, lasting impact on employees’ standard of living and allows us to grow a well-paid, highly skilled workforce for the benefit of our customers,” it concluded.

Striking Spectrum workers from IBEW Local 3 rallied on E. 23rd St.

A day earlier, City Controller Scott Stringer became the latest elected to visit a picket line.

Stringer joined strikers at a Spectrum payment center on the Upper West Side to shake hands and show his support.

Numerous city officials, including Mayor de Blasio on a recent appearance on NY1 — which is owned by Spectrum-Time Warner Cable — have called for an end to the protracted labor dispute.