In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/sbin/heater_available.sh line 4:

	logger -s -t${0##*/} -p err -- $*

                    ^------^ SC2086 (info): Double quote to prevent globbing and word splitting.

                                       ^-- SC2048 (warning): Use "$@" (with quotes) to prevent whitespace problems.

                                       ^-- SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

	logger -s -t"${0##*/}" -p err -- "$*"

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/sbin/heater_available.sh line 17:

if [ ${nbr_of_heaters##* } -gt 0 ]; then

     ^-------------------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

if [ "${nbr_of_heaters##* }" -gt 0 ]; then

For more information:

  https://www.shellcheck.net/wiki/SC2048 -- Use "$@" (with quotes) to prevent...

  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...