Rheem RTU no cool help

I got a call that a store’s HVAC is down. We had a big storm last night. The storm blew the control panel and compressor access panel completely off. It’s a Rheem package unit throwing code E20 (low pressure switch open) R410A

I put gauges on and I had 155psig static. I reset the unit and it started up per normal. I had a 50 F ambient. 78 degree store. Suction pressure 55 psig, head pressure 160psig. Cold suction, warm liquid, hot discharge.

Right away it threw another E20 code, but, quickly started up again. LPS opens at 45 closes at 95.

I let it run and then it turned on the economizer once the store got to about 74, with a set point of 72. Then it met set point.

I watched it run awhile longer and seemed to be running normal.

Because of the low ambient temperatures, I didn’t want to mess with the charge. I was thinking it could just be trying to run the AC in 50 degree weather is causing LPS trips. And combined with the door being blown off last night during the storm could have caused it to go down. Our stores have a lot of machines exhausting in them so, we run our AC quite a lot.

I am kind of at a wait and see with it right now, but of course the weather is supposed to dip to the 40s the next few days so, that doesn’t do me a lot of good trying to diagnose this AC