Hi. This is my first post here but you guys have always been a good point of reference for looking up any information.
I have a Pentair Minimax NT 250. Never had any problems with it and I only use it about 8 times a year. I use it exclusively for heating my Spa. It gives an E04 error code after running for a few minutes. Fan starts but burners don't ignite. Fenwal Ignition board has a single red flashing light (designated as air flow fault on the board). If I remove the hose from the fan assembly and suck for a minute, the burners ignite and the spa starts to heat. Soon as I remove my lips from the hose, the burners cut out and the ignition board has a single red flashing light as before. I've clean the nipples on the fan assembly and on the air pressure switch with a paper clip to no avail. This morning I fitted a new air pressure switch but that made no difference.
is there anything else I can do? Is it worth getting a new flange to see if I can get a better seal ($20) or am I wasting my time and I should buy a whole new fan assembly ($300). The fan runs fine and isn't noisy in any way.
Any help appreciated!