Rheem Powervent water heater only runs for 12 minutes

[rc772]

Rheem Powervent water heater with hot surface igniter.

The water heater still works, but after running for approx 12 minutes, the burner turns off and the blower keeps running. Then it starts the hot surface ignitor for approx 30 seconds but the burner won't start again. It will keep trying this cycle of starting the ignitor, but no flame.

I unplugged it, and tried again in an hour, and it will work again for 12 minutes, then turn off the burner, and start the whole cycle again.

I did notice the hose on the blower was cracked, and I cut off the bad section and reattached it, however this did not help the issue.

What are the possible issues causing this to occur? What could I try to troubleshoot next?

Thanks for any suggestions!

 

[rc772]

So it's been a few days since I've only been able to run the water heater 12 minutes every hour. But today it ran for 30 mins until I stopped it because that was strange behavior. I'll see if I can get it to run 40 minutes next time... that should be more than enough hot water needed.