What are some causes for a partially frozen evaporator (besides low charge) on a walk-in evap, 3 fan Larkin food cooler, full charge 404, was running fine, thermostat set on 38, 5 degree differential.
Got a call on this, haven't been there yet. Customer defrosted, but may call me back.
I know that's not much information, but it's pretty much all I have.
I have done all commercial HVAC, not allot of refrigeration, maybe 20%.
Thanks.