Have low suction pressure (190kpa low, 1800 head @ -3.5C), 8K superheat, 0-1K subcool with slight floodback with and accumulator. Also does have liquid injection but line has been crimped to eliminate from fault finding as couldnt find much info on liquid injections effect on operating pressures and sticky solenoid valve to be replaced. Could a blockage in evap cause this (see photo)? Any other possible causes? Note - this is after a refrigerant change from 507 to 404a and a new powerhead.
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