Making a bucket list of defects

I am trying to make a bucket for sentence long defects and put them in a column that is easier to filter by and group the defects into a certain defect code. I was able to get this working on a beastmode perfectly but when I try to add this in my ETL it gives me the code Failed to turn value string into Boolean.

Here is the SQL I have written...

CASE 

 WHEN `ComplaintDesc` LIKE '%COOL%' THEN 'COOLING'

 WHEN `ComplaintDesc` LIKE '%ICE%' OR '% ICE%' THEN 'ICE'

 WHEN `ComplaintDesc` LIKE '%GAS LINE%' OR '%GAS%' THEN 'GAS LINE'

 WHEN `ComplaintDesc` LIKE '%RECALL%' THEN 'RECALL'

 WHEN `ComplaintDesc` LIKE '%LEAK%' THEN 'LEAK'

 WHEN `ComplaintDesc` LIKE '%HEAT%' THEN 'HEAT'

 WHEN `ComplaintDesc` LIKE '%NOISE%' OR '%NOISY%' THEN 'NOISE'

 WHEN `ComplaintDesc` LIKE '%DOOR%' THEN 'DOOR'

 WHEN `ComplaintDesc` LIKE '%KIT%' THEN 'KIT'

 WHEN `ComplaintDesc` LIKE '%DRAIN%' THEN 'DRAIN'

 WHEN `ComplaintDesc` LIKE '%MISSING%' THEN 'MISSING'

 WHEN `ComplaintDesc` LIKE '%PART%' THEN 'PARTS'

 WHEN `ComplaintDesc` LIKE '%IGNIT%' OR '%IGNITE%' OR '%LIGHTING%' THEN 'IGNITION'

 WHEN `ComplaintDesc` LIKE '%UNREPAIRABLE%' THEN 'UNREPAIRABLE'

 WHEN `ComplaintDesc` LIKE '%LETTERS%' THEN 'LETTERS'

 WHEN `ComplaintDesc` LIKE '%BURNER%' THEN 'BURNER'

 WHEN `ComplaintDesc` LIKE '%FREEZE%' THEN 'FREEZE'

 WHEN `ComplaintDesc` LIKE '%NOT WORK%' OR '%NOT TURNING%' OR '%NOT START%' THEN 'NOT WORKING'

 WHEN `ComplaintDesc` LIKE '%ERROR%' THEN 'ERROR'

 ELSE 'OTHER'

END

Let me know your thoughts.

Thanks