Comes on for a sec. then goes off and on - Patton PUH9000-U Heater

check the heatshield that runs over the exhaust system they have a habit of coming lose a self tapping screw normaly fixes it

After burner on did you hear any spark ignitor if that your flame sensor is dirty or need to replace....good luck

sounds like communication cable issue.between relay module and thermostat.

When it goes on does it come on with a very dim screen and then shut off?

When its off what lights on front (led) are blinking?

the picture comes for 2 secs on the screen and immediately goes to stand by and red LED Sony bravia standby mode blinks 8 times

I cleaned the sensor that was at the the right further most burner on my Goodman and it worked. got the answer to my problem here at fixya. My burner flame only lasted 5 secs before it shut off. Thanks to all who took the time to send me a response.

Does it work well with other computers?
If you are connecting to a laptop, try switching display modes (like you would do for a projector)

Hi
I repair monitors
Based on other models , it sounds like you are having a powerboard-inverter issue.
It just so happens that I hjust got one in that's doing that, I should know in a day or two (maybe sooner) what the whole story on this model is.
Good timing !!??
ebaysbammbammfran

I had a similiar problem... I had to replace my bulb, which means $$$!

my monitor is 17'' lcd...... mag innovision model: LT716s..before was working well but now the lcd monitor don't to turn or either the led doesn't turn or make any sign.... no matter whta the lcd stay blak,,,,,do not want to turn on....