MiniMax NT Pool heater starts and then shuts off on error code EO4

Fixing a Pentair Minimax heater that turns on heat and then shuts off after a minute. Exhaust fan works and air switch works? Exhaust fan motor may have a slow moving fan blade not moving air fast enough through the exhaust flue and causing an error code of EO4. Also verify if your pump motor is not moving water too slow through the heater element causing an E04 error also. Get one of these capacitors before you take the heater apart and change yours out while its taken apart to help save your motor, some good cheap preventative maintenance, cheers. Click here - https://amzn.to/2G7sMgO