examined Fryer unit, not heating. 240v at plug for element. Opened element cover found voltage not passing through limit. Tried to reset, not able to, will need to be replaced. Unit is down. 1=89-0006=hi limit 1/4/2021 Removed oil heater, replaced hi limit, reinstalled and tested. Unit heated to 335 and cycled off. Customer cooked product, unit displayed SFT after 2 minutes and 30 seconds. Found hose loose on air switch. Cut back and reseated, ran unit 4 more times. No longer displaying any errors.