So it poured fine before you increased the temperature? I suspect the thermometer is not calibrated and the temperature of the beer is too high. Cup of water froze before turning up temperature so bottom of Krator was below 32F, but beer in keg may have been at 34F or so. Water in a glass at bottom of Krator may be a couple degrees colder than beer. Do you have a fan that stirs up the air in the Krator? I would turn temperature and regulator back down to what worked before and then make small adjustments from there if necessary. But you may have to bleed off CO2 first as suggested above.
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