Question about Rheem Water Heaters
I have an almost brand new Rheem PowerDirect Vent Water heater. Maybe 4 months old. Now this is probably the third time it has done this. The exhaust fan motor can be heard cycling every once and a while. The code it flashes is Pressure Switch remained open longer then 5 secs after combustion blower was energized. I have pulled off the intake piping that runs directly about 8 feet over and out the side of the house. With the pipe disconnected the water heater will work fine. As soon as it is re-installed it codes out again. With everything in tact, I pull the small hose from the intake pipe that feeds the pressure switch, everything works fine. The moment the hose is reconnected, el no worky. I have checked the intake pipe for obstructions none to be found. When it is cycling, when I place my hand near the vent outside it sucks my hand. The only thing I can think of is that the pressure switch has some how become un-calibrated. Is this possible?
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Posted on Jan 02, 2017
SOURCE: Kenmore Economizer 6 Gas Water
A few things...
Fisrt off these pressure switches are very sensitive instruments and work on VERY small pressures. so it they wear just a bit they fail to work.. this insures maximum safety. So if all else checks out replace the pressure switch, they fail often, but it is the only way to run these things safely.
Also check all the tubing going to the pressure switch for moisture... just a few drops of water and cause them not to work...
When you start the unit... jumper the pressure switch with in the five second window and see if it lights... is is does then you know for sure the problem is there...if not then the problem could be in the control board.
If you own and know how to use an OHM meter you also can check the switch with the unit running to make sure the contacts are closing.
Bottom line... I think you have a bad pressure switch, but check out everything else first before replacing it.
Posted on Aug 17, 2011
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