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Rheem 50 gallon powerdirect vent waterheater keeps cycling

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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  • Rheem Master
  • 15,691 Answers

Take note of the barometric pressure when this happens.

Posted on Feb 10, 2014

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Posted on Jan 02, 2017

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heatman101
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SOURCE: Kenmore Economizer 6 Gas Water

Hi,
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.

heatman101

Posted on Aug 17, 2011

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2 Answers

I have Rheem Pvw50, 50 gallon water heater installed at home. For the past few days, there is a noise coming out of blower motor. What could be the reason?


Your water heat is at an age that I would recommend replacing the whole unit. That one cannot be too efficient and most likely has sediment built up on the bottom of it pretty bad.

Jan 25, 2016 | Rheem Water Heaters

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Can i use my old vent pipe i had for my old 40 gallon water heater


If you are installing new tankless in place of 40 gallon gas water heater, then you CANNOT use same vent pipe.
You must use larger diameter pipe that is specified by instruction sheet, and the pipe must be approved plastic or stainless steel to avoid corrosion.
The vent pipe must also have a condensate trap to catch acidic water that drips back down the vent pipe.
The reason is that tankless burn more gas than regular tank-type heater... because tankless must raise temperature quickly as water passes in a pipe.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Gene

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My co2 dector sounds alarm near hot water heater


Bad vent
Check the draft (test the vent)
Call service technician immediately.
DIY steps on link below
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#vent

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Jun 18, 2014 | Rheem Water Heaters

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Rheem 22V50F1 pilot won't stay lit. Changed thermo couple & it lit, ran then went out. Let it sit overnight & it lit, ran then went out. What next? p.s. The unit is 5 years old. Thanks


If pilot lights and flame is robust and clear blue, and pilot goes out later, then some suspects can be excluded: air in gas line, low gas pressure, thermocouple is overtightened (finger-tight + 1/4 turn), thermocouple not positioned correctly in the flame, dirty pilot tube.
If flame is yellowish and small: then clean pilot tube and combustion parts.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean
Remaining suspects can include: air in gas line, low gas pressure, bad gas control valve, tight house so household vent fans pull air down water heater vent that blows out pilot, hot attic with inadequate ventilation, water dripping down vent.

Open following links to read troubleshoot resources.
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Aug 16, 2011 | Rheem 50 Gallon FVR NATGAS Water Heater...

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RHEEM 50 GALLON WATER HEATER,4 BLINKS THEN 2 BLINKS ,ECO FAILURE,UNPLUGGED HEATER STARTS UP AGAIN THEN FAILURE OCCURS AGAIN.


That is a power vent failure code.
Rheem is aware of this problem and are changing systems as we speak. Call your Rheem dealer and demand the updated system.

Feb 07, 2011 | Water RHEEM 40 Gallon FVR PROP PWR Heater...

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21vp50-1 rheem water heater, the ignitor is not working


1) Rheem does not show that exact model number, since they list current products only.
http://www.rheem.com/products/tank_water_heaters/gas_water_heaters

2) Rheem serial number shows year of manufacture on second 2 digits. So C06 was made in 2006.
Today's manual might not have troubleshoot steps that match older product.

3) 21vp50 is 50 gallon power vent water heater.
Open following link to identify product.
New models have Honeywell electronic gas valve with LCD flashing error codes.
http://www.rheem.com/product.aspx?id=C24E3F52-A6A4-4BC7-AF5B-0DF23A7A0263
http://waterheatertimer.org/gas-water-heater-timers.html#Rheem

4) Sample manual for newer power vent models shows error codes and troubleshoot steps:
http://globalimageserver.com/fetchDocument.aspx?id=a92c7d0e-8a95-48ba-8810-cd714f33d47a

5) Earlier Fixya answer suggests where to buy ignitor for 21vp50:
PART #HSI51409A
http://www.fixya.com/support/t3641891-rheem_21vp50_1_igniter_stopped

6) Your manual should show troubleshoot steps and expanded parts list.
Always save manuals like gold, and save searching later for a manual at Fixya.
If we can't find the manual, then our answers are limited to suggestions and guesses, since we're not on-site and can't perform troubleshoot steps for you.

7) Post your question on professional water heater forum
http://www.thetankatwaterheaterrescue.com/forums/forum3/

8) Call Rheem and they can possibly suggest which local service technician will work on that model:
2600 Gunter Park Drive East
Montgomery, Alabama 36109-1413
Phone: 1-800-432-8373.

9) Call a local plumber.

10) Install inexpensive home-center brand gas water heater yourself:
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

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1 Answer

Rheem power vent motor doesn't shut off


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1 Answer

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