It is an axiom among community theaters that the season should start with a comedy. It is also an axiom that suitable comedies are hard to find.

After 30 years the Rockville Little Theater may be finding the choice particularly difficult. "Room Service," the play with which it recently opened its 31st season, had few virtues. With a cast of 12 men and two women. "Room Service" concerns a theatrical producter's attempts to find a backer for his latest play while sustaining the company on credit in a second-rate Broadway hotel.

The plot is predictable and thick. The company is about to be evicted, the hotel manager, the producer's brother-in-law, is about to lose his job for extending credit; the playwright, a local from Oswego, N. Y., arrives without warning or money; the backer who is found will deliver the money a day too late, and on and on.

Burdened with dialogue as predictable as the plot, the actors tried gamely to keep the pace going. The result was duty done and little fun. The set and costumes had an authentic 1930s look. However, a good-sized audience enthusiastically supported the cast.

In December Rockville Little Theater will present Edward Albee's "A Delicate Balance," a subtle work that should restore some balance to the company's season.