I had my Geo installed in the summer of 2013 in our new shop. our shop is 72 by 120 with 18' side walls. winter of 13 and 14 everything went great! now after our recent cold spell my system wont run. it keeps throwing an alarm saying "Lockout! Prs2" and sometimes "Lockout! Prs1" Can anyone point me in the right direction as to what to check or do?
High pressure faults in heating are most commonly caused by inadequate load flow. Check pressure drop across the load HX and compare with chart in the manual to get GPM. 42 gpm is optimal for your unit with load side EWT no higher than 120f. Check and clean load side y-strainer. Your unit has brazed plate HXs and need y-strainers to protect them from fouling. Check load pump operation.
