Recent content by gmattfp

My first post, I have a MiniMax NT Low NOx heater (400,000btu). About 10 years old but with little use. The internal sheet metal under the top plastic cover has rusted away. Exhaust blower is still in place and working but unit doesn't stay on. I know I could manufacture and replace the sheet...

At what time in the sequence can the vacuum switch be jumpered?

Removed cover and blower cage looks okay. Fan blows hard during initial purge cycle. Then cuts back to lower speed. Currently the glow plug turns on when the fan goes to low speed. After it heats up, the gas valve opens and the burners ignite. The fan is then supposed to go to high speed but...

The E04 error (fan vacuum failure) re-appeared after I replaced the flame sensor, see original fault in original post. Prior to replacing flame sensor, the heater would cycle through but no error code. Seems that in some cases if multiple failures occur, then the error codes don't display...

I found that indeed it is a LoNox unit, TSI type. Went to check flame sensor but when I tried to unplug wire, the sensor came out of the unit. The bracket and screw holding it in place have rusted away. I'm afraid of what I might find inside. I can likely make a new bracket but don't know...

I am having an issue with my Minimax NT. Fan comes on high to purge, then operates at low speed while igniter heats up, gas valve opens and flames start for a second then go off. Fan then switches to high speed to purge and cycle repeats. After a few times, E04 appears on display. Is the...

gklein: did you ever resolve your Minimax NT fan issue? I am havingthe same problem today.