The puzzle can be played online on penpa-edit using this link.
Thank you so much to cdwg2000 and Moss for pointing out i'd messed up the thermometers and put them on backwards. Have fixed the grid and re-uploaded the intended puzzle.
Solution code: 4th row followed by 6th row, with no spaces.
on 11. June 2020, 17:26 by Greg
Edited Description
on 11. June 2020, 16:57 by Greg
Re-uploaded with correct thermometers. Thanks @cdwg2000 and @moss for pointing out my mistake.
on 11. June 2020, 13:12 by sf2l
so it's not just me....
on 11. June 2020, 12:21 by SirWoezel
@moss Finding out what was wrong with the puzzle is at least as impressive as the puzzle itself!
on 11. June 2020, 10:35 by moss
It does have a (unique) solution if you assume that the two thermos in the central square are reversed (having the bulbs on the right instead of the left).