Failover_command in pgpool is not working?

I have setup pgpool with load balancing and failover mode.

This is my failover command:

failover_command='/usr/local/etc/failover.sh %d %P %H %R'

The following is the script:

#!/bin/bash -x

FALLING_NODE=$1         # %d
OLDPRIMARY_NODE=$2      # %P
NEW_PRIMARY=$3          # %H
PGDATA=$4               # %R

if [ $FALLING_NODE = $OLDPRIMARY_NODE ]; then

    if [ $UID -eq 0 ]

    then

        su postgres -c "ssh -T enterprisedb@$NEW_PRIMARY touch $PGDATA/trigger"

    else

        ssh -T enterprisedb@$NEW_PRIMARY touch $PGDATA/trigger
    fi

    exit 0;

fi;

exit 0;

But somehow the script is not executing as expected.

I have stopped the Master DB. According to script the slave should take the role of master but this was not happening in the script.

After failover from pgpool end:

show pool_nodes;

Output:

edb=# show pool_nodes;

 node_id |  hostname  | port | status | lb_weight |  role
---------+------------+------+--------+-----------+---------

 0       | 10.0.0.149 | 5444 | 3      | 0.500000  | standby

 1       | 10.0.0.158 | 5444 | 2      | 0.500000  | standby
(2 rows)

Please help me out to fix this issue.