This what worked for me. Soaked the print head in distilled water (condensate from my dehumidifier) with a few drops of dishwasher rinse aid added. Rinsed it thoroughly and changed the water numerous times over four days, till the rinse ran clear. ...
In my case it is the red that does not flow. If I clean then run a nozzle check it is good, then a page or so later red becomes streaky or non existent. It happened after I left it for three months, powered off while I was away. i have removed and...
I believe it has a 60 hour timer since last used and then it does a head clean purge which wastes a lot o fink. I try to remember to either use it or run a nozzle check to exercise it within the 60 hours. Nozzle check uses minimum ink and exercises...