hotend keeps clogging in the heatsink

I have a blue hf rapido and orbiter 2,
It starts laying down layers beautifully, then about 3 to 4th layer I can hear it clicking and it's clogged in the blue heat sink, I can't figure it out. So was going to try another hotend I have that's new rapido uhf black. But when editing the cfg for the thermistor none of them work klipper keeps giving me a red error msg. So I don't know what to set it to to test it out. Everything is set to default settings in ratos 2.1 when I do the set up. I think the blue is a bad hot end .
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