Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 06-13-2016, 09:32 AM   #1
Senior Member
 
Boeing Guy's Avatar
 
Winnebago Owners Club
Freightliner Owners Club
Join Date: Jul 2010
Posts: 304
Blog Entries: 1
Water Heater relief valve leaking

I have a 2004 Winnebago Journey, with an Atwood 10 gallon water heater. The pressure/temperature relief valve started leaking. First it would drip a little bit, just a drop a second or so. I opened and closed the valve, and it appeared to stop. It starter leaking a lot. I shut off water pressure, turned off the heater, and drained the tank. I sprayed a little (lot) of WD40 into the valve stem, thinking there might be some grit or rust on the stem. I turned the water on, and the heat. It looked good for a few minutes, and we went to dinner. When I returned, water was flowing out the relief port, pretty steadily. Not gushing, but flowing pretty good.

I put the water heater bypass valve in bypass, so water wouldn't flow to the water heater, and turned off the water heater switch.

I was told to change the overpressure valve, but suspect that it is just doing it's job. If there is a quick troubleshooting procedure I can do and a not too difficult maintenance fix, I'd like to fix it. Otherwise, we will take showers at the restroom and get it fixed when we return home in a few days. Any info is appreciated.
__________________

__________________
Jim and Vicky, Belleville, IL
2004 Winnebago Journey
2012 Explorer Toad
Boeing Guy is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 06-13-2016, 09:41 AM   #2
Senior Member
 
Damon Owners Club
Ford Super Duty Owner
Join Date: Apr 2011
Posts: 493
s
Common issue with relief valve. Home Depot/Lowes has replacement - easy DIY fix!

Bronk
__________________

__________________
bronk is offline   Reply With Quote
Old 06-13-2016, 09:49 AM   #3
Senior Member
 
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 1,400
Quote:
Originally Posted by bronk View Post
s
Common issue with relief valve. Home Depot/Lowes has replacement - easy DIY fix!

Bronk
X2
Lynn
__________________
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
LETMGROW is offline   Reply With Quote
Old 06-13-2016, 09:57 AM   #4
Senior Member/RVM #90
 
MSHappyCampers's Avatar


 
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 26,200
You could check the temp of the water coming out, but as others have said, it's probably just a defective valve!
__________________
Joe & Annette

2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
MSHappyCampers is offline   Reply With Quote
Old 06-13-2016, 10:14 AM   #5
Member
 
Join Date: Jun 2013
Posts: 43
If you go to purchase a replacement valve from a big box store, confirm the thread size on your water heater before you leave. Some are 1/2" NPT and others are 3/4" NPT. It may save you a second trip if you do not chose wisely the first time.
__________________
Len
LDMcL is offline   Reply With Quote
Old 06-13-2016, 10:15 AM   #6
Senior Member
 
skypilot_1's Avatar
 
Tiffin Owners Club
Join Date: Oct 2011
Location: Summer in The Ozarks
Posts: 771
Since you don't have a Suburban water heater this may not apply to yours, but its worth checking out.

Our Pressure Relief Valve was "dripping" when heater was on gas or electric didn't matter which. I was set to replace the Pressure and Temperature Valve as the dripping water was corroding everything steel in the compartment. Had been doing it for some time before I noticed small amount of water dripping from cover outside. Got the Suburban manual out to find PN of relief valve. While reading the manual, I found this bit of info.

WATER WEEPING OR DRIPPING FROM PRESSURE RELIEF VALVE
"You may experience water weeping or dripping from your water heater's P & T valve when your water heater is operating. Water weeping or dripping from the P & T valve does not always mean the P & T valve is defective. As water is heated, it expands. The water system in a RV is a closed system and does not allow for the expansion of heated water. When the pressure of the water system exceeds the relieving point of the P & T valve, the valve will relieve the excess pressure.
One way to reduce the frequency of this occurrence is to maintain an air pocket at the top of the water heater tank. This air pocket will form in the tank by design. However, it will be reduced over time by the everyday use of your water heater. "
Then it lists six steps to introduce air into the tank. Followed by this quote.

"Repeat this procedure as often as needed to reduce the frequency of the weeping of the P & T valve. If the weeping persists after following this procedure, you may elect to install an expansion or accumulator tank in the cold water line between the tank and check valve to relieve the pressure caused by thermal expansion."
It took years to happen to see water dripping from outside water heater panel. In that time of weeping/dripping water had corroded everything under the P & T valve. Our gas burner parts are so rusted they are unsafe to use. Sure wish I'd have known this a couple years ago. As for a water accumulator tank, our last SOB had one, (and never had this problem) but don't recall hearing of them in AB's. If you haven't removed your water heater outside cover lately, maybe you should.
This may not be the OP's leak problem, but felt it was a good place to introduce the Suburban allowed leak issue.

_________________
__________________
Ret. Military/Corporate Pilot
Key West Snowbirds
"Age is an issue of mind over matter. If you don't mind, it doesn't matter"
skypilot_1 is offline   Reply With Quote
Old 06-13-2016, 11:22 AM   #7
Senior Member
 
Pigman1's Avatar
 
Join Date: Sep 2011
Posts: 1,937
The valve has 2 functions. It'll relieve when the pressure is too high or when the temp is too hot. If the faucets aren't blowing the water glass out of your hand when you go to get a drink, you don't have a pressure problem. If the steam coming from the sink doesn't straighten your DW's new hair-do, you don't have a heat problem. Get a new valve.
__________________
Pigman
2013 Tiffin Allegro Bus 43QGP
2011 Chevy Silverado 1500 Toad
Pigman1 is offline   Reply With Quote
Old 06-13-2016, 11:28 AM   #8
Community Moderator
 
barmcd's Avatar


 
Monaco Owners Club
Texas Boomers Club
Join Date: Nov 2015
Location: Central Texas
Posts: 4,387
I was able to find the exact same brand and model relief valve for my suburban heater at home depot. You may have good luck too.
__________________
Dennis and Katherine
2000 Monaco Dynasty
barmcd is offline   Reply With Quote
Old 06-13-2016, 02:09 PM   #9
Senior Member
 
skypilot_1's Avatar
 
Tiffin Owners Club
Join Date: Oct 2011
Location: Summer in The Ozarks
Posts: 771
A brand new P&T relief valve may do the same thing. Many RV water heaters weep/drip water and since you don't look for it outside behind heater cover you don't know it till the rusted area is seen.
Since most newer RV water systems don't have accumulator tank or water hammer. The relief valve will pass water when the air pocket at top of water heater tank is lost. These systems are made to leak water out of P&T valve. Yes, a S&B house water plumping is different. Which is why most folks call for replacing the valve, they don't understand how these closed systems function.
__________________
Ret. Military/Corporate Pilot
Key West Snowbirds
"Age is an issue of mind over matter. If you don't mind, it doesn't matter"
skypilot_1 is offline   Reply With Quote
Old 06-13-2016, 04:22 PM   #10
Senior Member
 
Tha_Rooster's Avatar
 
Join Date: Aug 2008
Location: Georgia
Posts: 4,507
Quote:
Originally Posted by Boeing Guy View Post
I have a 2004 Winnebago Journey, with an Atwood 10 gallon water heater. The pressure/temperature relief valve started leaking. First it would drip a little bit, just a drop a second or so. I opened and closed the valve, and it appeared to stop. It starter leaking a lot. I shut off water pressure, turned off the heater, and drained the tank. I sprayed a little (lot) of WD40 into the valve stem, thinking there might be some grit or rust on the stem. I turned the water on, and the heat. It looked good for a few minutes, and we went to dinner. When I returned, water was flowing out the relief port, pretty steadily. Not gushing, but flowing pretty good.



I put the water heater bypass valve in bypass, so water wouldn't flow to the water heater, and turned off the water heater switch.



I was told to change the overpressure valve, but suspect that it is just doing it's job. If there is a quick troubleshooting procedure I can do and a not too difficult maintenance fix, I'd like to fix it. Otherwise, we will take showers at the restroom and get it fixed when we return home in a few days. Any info is appreciated.

You turned off water pressure, how much water pressure do you have which to much is a common cause for residential and rv to leak.
__________________
2007 Fleetwood Revolution LE 40V
Tha_Rooster is offline   Reply With Quote
Old 06-14-2016, 11:13 AM   #11
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 18,060
This is hardly an unusual or difficult problem. Step #1 is to make sure the "Air head" in the tank is maintained at the proper level, and the heater op manual should have a procedure for that. Once you are sure the air head is OK, if it still drips the PTR valve should be replaced. It's a standard type, available at most any home or hardware store - nothing "RV" about it. Check the thread size, as somebody already advised. Best method is to remove the old one and take it with you to the store so they can match it.
__________________
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is offline   Reply With Quote
Old 06-14-2016, 11:34 AM   #12
Registered User
 
mel s's Avatar
 
Join Date: Mar 2010
Posts: 8,777
Quote:
Originally Posted by Boeing Guy View Post
I have a 2004 Winnebago Journey, with an Atwood 10 gallon water heater. The pressure/temperature relief valve started leaking. First it would drip a little bit, just a drop a second or so. I opened and closed the valve, and it appeared to stop. It starter leaking a lot. I shut off water pressure, turned off the heater, and drained the tank. I sprayed a little (lot) of WD40 into the valve stem, thinking there might be some grit or rust on the stem. I turned the water on, and the heat. It looked good for a few minutes, and we went to dinner. When I returned, water was flowing out the relief port, pretty steadily. Not gushing, but flowing pretty good.

I put the water heater bypass valve in bypass, so water wouldn't flow to the water heater, and turned off the water heater switch.

I was told to change the overpressure valve, but suspect that it is just doing it's job. If there is a quick troubleshooting procedure I can do and a not too difficult maintenance fix, I'd like to fix it. Otherwise, we will take showers at the restroom and get it fixed when we return home in a few days. Any info is appreciated.
Boeing Guy
If/when the water heater looses it's head of air, (aka: air cushion), the T&P can leak.

See T&P Valve at this link: Water Heaters
__________________
mel s is offline   Reply With Quote
Old 06-14-2016, 11:50 AM   #13
Senior Member
 
Join Date: Sep 2012
Posts: 5,933
FWIW It would seem to me that the easiest way to troubleshoot the problem would be to turn off the heater and run out some hot water to cool things down. shut off the water, loosen the drain plug and let a gallon or two out then replace/tighten the drain plug. That puts air in the top. Then put the tank back in operation. If there is much of a leak it will not take long for the drip to come back.
__________________
nothermark is online now   Reply With Quote
Old 06-14-2016, 02:59 PM   #14
Junior Member
 
Triple E Owners Club
Join Date: Oct 2014
Posts: 13
Turning the lever a couple of turns will rotate the valve on its seat and often cure the drip. I have done this several times when I thought I had a defective valve.
__________________

__________________
keefr is offline   Reply With Quote
Reply

Tags
leak, heater, water heater, water, heat



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Help A/C leaking water due air flow maxwell18 RV Systems & Appliances 5 07-31-2013 06:36 AM
Help my ahe-100-02s over flow tank never goes empty jeepstermog RV Systems & Appliances 4 12-07-2011 12:41 AM
water tank over flow JohnLori Alpine Coach Owner's Forum 13 01-02-2010 10:15 AM
back flow water heater valve check ruylopez RV Systems & Appliances 7 06-12-2009 11:36 AM
need name of rv body shop that tiffen use for over flow work george henry Tiffin Motorhomes Owners Forum 3 12-22-2007 10:41 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:38 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.