John Yems' side are now unbeaten in nine games in all competitions and have won the last three away games.
The win has put them up to sixth in the League Two table.
The Reds played superbly in the first half but could not find the goal to break the deadlock.
But just 16 minutes after the break. a brilliant passage of play saw Tom Nichols tee up the on-rushing Francomb who tucked the ball away.
Bolton hit back with a number of chances but Glenn Morris was on form with a number of excellent saves.
Reiss Greenidge was sent off for Bolton after picking up a second yellow after smashing into Nichols.
Reds: Morris, Davies, Craig, Tunnicliffe, Dallison, Powell, Francomb (Bulmanat 70), Hessenthaler, Matthews (Ashford 70), Nadesan (Sesay 87), Nichols