Hi have Model: 0052590..2006 35kw.
Went to do weekly check and the low coolant/high heat light was lit.
Unplugged the level sensor and the temp senor and still, it starts, runs
about 4 seconds and shutsdown with trouble light.
I replaced the control board, almost $500, it ran good no problem for
a couple of weeks and now back again where I started.
Down here in Louisiana and have a tropical system sitting on me now.
Any suggestions would be GREATLY APPRECIATED.
First check and make sure it is not low on coolant. If this is OK you can unplug the low coolant sensor and jumper it with a 1000 ohm resistor or a small gauge wire will do. See if the unit will stay running to get you through.