I bought a used Minimax CH gas heater and the guy told me the inlet/outlet ports were switched. Meaning the inlet is now the outlet. He said there was a switch to change them back to normal. I have looked all over in the manual and inside the heater, I see nothing like that.
Ive tried to contact him but no replies. Any of you techs know of this? I know I can switch what side the ports are on, nothing about switching the flow though.