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Rheem powervent2 water heater not starting

No hot water, found the vent outside was blocked with snow (LED was flashing 4 times and manual said this could be a problem with the vent). Cleared away blockage and now blower is venting but water heater won't work. I unplugged the water heater and plugged back in. Blower cycles on and off for 10 seconds and the LED indicator is flashing "fast" (manual says this is normal and it is calling for heat). After about 1 minute the LED goes back to flashing 4 times (manual says this could be a blocked vent but I know we have fixed this).

Is there something else we have to do to reset the controls or the gas or something? We didn't adjust or turn off anything else other than what I've said above. We did not toucht he gas supply.

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  • davidjacq515 Jan 24, 2009

    Thanks for the suggestion...but I did not see anything like a flag switch (no electrical device that is inserted into the vent pipe). The blower has two small hoses on the outlet pipe spaced apart by about 3-4 inches. I believe these measure the differential static pressure in the vent pipe across an internal orifice and if there is a blockage they would read the same pressure and tell the system that there is a blockage. Now that there is definitely airflow when the blower is running I don't see why it isn't reading a proper differential pressure.



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Hi - I have a backyard inground pool heater that runs on gas. It had a problem the last few days with its control module - ran constant - heated the pool to 95 degs!! In doing so, must have hogged enough gas that my hot water heater indoors could not get enough to run constant - it went off. I got the yard unit shut down, but could not get the HW heater indoors to fire. Same symptoms as above - 4 flashes.

I thought about the suggestion - and went to my unit, and inspected the short clear hose on top of the unit that goes from one side of the blower to the other - looks like it goes from and to some sort of presure sensing diaphrams, or something.

I shut off the power via the switch on top, on the blower - the red led light went out on the gas unit. I shut the gas valve on the gas unit off as well.

The hose is only 6 " long - I saw a big ball of moisture just outside of the upper diaphram nozzel that goes into the hose - pulled off the friction fit on the lower end, and tapped the moisture into a very lot of small bits.

Plugged the line back on, turned on the power, turned back on the gas valve and after 10 seconds - it lit up!

Will keep an eye on it, and take it apart farther if moisture continues to be a problem. Has been very humid the last week - that might have agravated it. Thanks for the thought stimulus - saved me $250 no doubt!

Posted on Aug 07, 2012

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I am guessing that their is a flag control(switch) in the airstream of the vent and it is now stuck in the closed position due to the snow, maybe. Find the flag switch and make sure it can move freely. It must move freely for the venter fan airstream to operate or move it.  

Posted on Jan 24, 2009


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