Got a call out last night to a walk-in freezer. Went to check it out and noticed the condenser wasn't running. Checked pressures and found it was off on low pressure control. Checked thermostat and it was opening and closing the solenoid at the matched temp on my thermometer. I spoke to the manager and they wanted me to add refrigerant for over the weekend and come back and do a leak test. Added 1lb of 404a and unit sprung to life again but I noticed that when I stopped adding refrigerant the compressor would pump down. there is absolutely no hissing in the evaporator whatsoever. I'm stuck.
other things i've checked for:
There is no frosting anywhere to show
The solenoid is getting 208v and clicking up and down (maybe piston is broken?)
Checked solenoid with solenoid magnet and still hear clicking
things i've thought about:
clogged filter drier, like 100%?
slammed shut txv?
Gremlins?
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