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Tri Tube prestige Solo E03

kcopp Member Posts: 4,305
I have been asked to figure out an E03 nuisance lockout on a 6 yr old Triangle Tube Prestige Solo. It is the older control board w/ the mcba control.
Natural gas.
It is a commercial application. Area heated is above a parking garage and is fin tube run in the area above to keep the piping from freezing.
Unit will lock out every day or two w/o fail.
Manual says to check gas valve rectifier cable. Looked fine. Replaced... same problem.
Called TT.
TT tech support suggests the gas valve coil may be the issue. Replace That. Do a combustion test, Hi and Low fire All w/in spec.
Gas pressure is ok.. Static 6.23... 5.3 at hi fire.
Short of replacing the board (which seems unlikely the issue) What do I look for?