We present results from 30 nights of observations of the open cluster NGC 7789 with the WFC camera on the INT telescope in La Palma .
From \sim 900 epochs , we obtained lightcurves and Sloan r ^ { \prime } - i ^ { \prime } colours for \sim 33000 stars , with \sim 2400 stars with better than 1 % precision .
We expected to detect \sim 2 transiting hot Jupiter planets if 1 % of stars host such a companion and that a typical hot Jupiter radius is \sim 1.2 R _ { \mbox { \small J } } .
We find 24 transit candidates , 14 of which we can assign a period .
We rule out the transiting planet model for 21 of these candidates using various robust arguments .
For 2 candidates we are unable to decide on their nature , although it seems most likely that they are eclipsing binaries as well .
We have one candidate exhibiting a single eclipse for which we derive a radius of 1.81 ^ { +0.09 } _ { -0.00 } R _ { \mbox { \small J } } .
Three candidates remain that require follow-up observations in order to determine their nature .