Jayco RV Owners Forum
 


Reply
 
Thread Tools Display Modes
 
Old 06-13-2012, 07:28 PM   #11
Junior Member
 
Join Date: Feb 2012
Location: West Friendship
Posts: 9
We have a similar problem with our Jayco 31SS tankless hot water heater. Even on "low" the water in the shower is absolutely scalding with the hot water turned on all the way. It does not cycle on and off, but you cannot get enough flow to be able to use the shower without getting burned. If you turn on enough cold water to make yourself comfortable, the water heater will cycle. The only option that seems to work is to turn on the kitchen sink full blast on hot while you shower, and even then some cold water is required in the shower. We have tried all the shower adjustments and have tried to change our hoses and connectors to maximize flow. Any ideas?
__________________

cat_and_matt is offline   Reply With Quote
Old 06-25-2012, 01:23 PM   #12
Senior Member
 
bgermane's Avatar
 
Join Date: Apr 2012
Location: Southern California
Posts: 171
The problem seems to be a combination of flow-rate and incoming water temp. According to Girard, the units were designed for a minimum flow of 1.25 gpm in order to prevent the cycling. My unit flows at approximately 0.8 gpm with the shower head removed.

Here in southern California, my domestic water temp where I live, is about 65-70 degrees. The Girard heaters raise the temp 45-50 degrees. I forget the exact temp I was told, but the high heat limit is set at something like 115 degrees. The combination of low flow rate, and "higher" incoming water temp, lead to the heater tripping on a high heat limit.

I just got back from a trip to Yellowstone. Incoming water temp was in the 50 degree range. The water heater performed fine. The flow rate at the head is poor, but the heater still performed correctly. I'm working with Jayco, and my local dealer to try to resolve this. Jayco believes that there may be a faulty sensor in the heater. We'll see.
__________________

__________________
Brian, Mary, kids, beagle - Moose, and mutt - Maggie.
2012 Greyhawk 31FS
2013 Ford Explorer Toad
bgermane is offline   Reply With Quote
Old 10-28-2014, 03:15 AM   #13
Junior Member
 
Join Date: Oct 2014
Location: El Paso
Posts: 1
Quote:
Originally Posted by bgermane View Post
Just took delivery of a new 31FS. It has the tankless water heater. It works great when using the sink faucets, but, not so well with the shower. It continually cycles from hot to cold every 20 seconds.

In the manual, it states that this will happen when it is not getting enough flow, and the high heat limit is tripped. I'm not sure how to get more flow. I open the hot water valve completely without any cold and it still cycles.

Does anyone have any experience with this? Thanks in advance,
We had same problem and had it in the shop 3 times. It took more than a year to find out that you adjust the temp on unit (our control is in the bathroom) and then USE ONLY THE HOT WATER faucet in the shower. We took turns standing outside the shower adjusting the gage for the most comfortable temp for our spouse the first time. DO NOT TURN ON THE COLD WATER or it makes the heater turn off and on and you get the hot then cold water cycling because of the back flow. It cycled a little bit when we put the shower on water saver while washing. It worked best just letting it flow. It was rather cold outside and only got warm, not hot. It gets hot if the outside temp is not too cold. We were dry camping.
Sheiladitexas is offline   Reply With Quote
Old 10-28-2014, 08:02 AM   #14
Senior Member
 
3'senough's Avatar
 
Join Date: Sep 2010
Location: New York
Posts: 1,887
Quote:
Originally Posted by Sheiladitexas View Post
We had same problem and had it in the shop 3 times. It took more than a year to find out that you adjust the temp on unit (our control is in the bathroom) and then USE ONLY THE HOT WATER faucet in the shower. We took turns standing outside the shower adjusting the gage for the most comfortable temp for our spouse the first time. DO NOT TURN ON THE COLD WATER or it makes the heater turn off and on and you get the hot then cold water cycling because of the back flow. It cycled a little bit when we put the shower on water saver while washing. It worked best just letting it flow. It was rather cold outside and only got warm, not hot. It gets hot if the outside temp is not too cold. We were dry camping.
What about installing a check valve? One could be installed on the hot output of the heater.
__________________

2014 375 BHFS Eagle Premier
2014 Ram 3500 Longhorn DRW CC
6.7 CTD, Aisin, 4.10's
Yamaha EF3000iSEB
3'senough is offline   Reply With Quote
Old 10-28-2014, 07:40 PM   #15
WDW
Senior Member
 
Join Date: Oct 2014
Location: Western NY
Posts: 223
How about this... Worked fine but had sporadic shots of cold water then back to hot. Certainly motives you to be done.... Anyone had this problem?
__________________
'16 Coachmen Mirada 35BH

Formerly 31FK 15 Grayhawk
Toad: 2015 Jeep Cherokee "The Caboose".

Taking in the sights wherever my Trolley takes me!
WDW is offline   Reply With Quote
Old 10-28-2014, 08:11 PM   #16
Member
 
mitchmitchell's Avatar
 
Join Date: Oct 2014
Location: Flower Mound
Posts: 93
Hmm, on the tankless water heaters we have in our house we were told to set the units temperature to what was comfortable for us with the valve on full hot. I think ours is set to 105 degrees. Turning the flow down on the faucet does not seem to cause any kind of cycling. Sheiladitexas is probably right on how to use it.
mitchmitchell is offline   Reply With Quote
Old 10-28-2014, 09:22 PM   #17
Senior Member
 
D&MAKAFUN's Avatar
 
Join Date: Jul 2014
Location: KC MO
Posts: 358
I also agree with not adding cold. If you add cold at the faucet, it doesn't effect what is happening at the WH.
If you have 40# of pressure and you have nothing but the hot faucet on, you will have 40# of hot flow. Right? So if you have the hot faucet on and then add cold, you still have 40#psi flow. The WH doesn't know you have added cold so it continues to heat until it maxes and shuts down.
Using hot faucet only, full flow will give you the mildest of hot water. Moderating the flow will increase the temp by restricting the flow through the WH.
Dial in the bathroom is key. Never had ours hotter than 12 o'clock-1 o'clock. Showers..... we run the water continuously except when dry camping. Even when we stop the flow during the Navy showers, the hot line is still full of hot water so we haven't noticed any temp difference with the cycling.
__________________
Darrell, Mary & K.C. Toller Mix
In our hearts: Goldens, Tess & Jericho
'15 Jayco Precept 31 UL "Bertha"
'13 Wrangler Sahara...AKAFUN
Roadmaster base plate
Ready Brute Elite towbar and brake combo
D&MAKAFUN is offline   Reply With Quote
Old 10-30-2014, 07:15 PM   #18
Junior Member
 
Join Date: Sep 2013
Location: Wentzville
Posts: 8
We have the tankless water heater in 2014 Melbourne 29D and water temp in shower cycles from hot to cold and back as OP describes. This is true no matter whether on City Water or the onboard fresh water tank. Playing with the temp knob does have some effect on this but DOES NOT FIX IT. As of October 2014, Jayco has no answer for this. Is hard to believe that it could be an open issue for YEARS.
chasfenwick is offline   Reply With Quote
Old 10-31-2014, 10:42 AM   #19
Senior Member
 
D&MAKAFUN's Avatar
 
Join Date: Jul 2014
Location: KC MO
Posts: 358
http://greenrvproducts.com/operating...2/gswh-1m-new/
Hi chasfenwick. If you haven't done a search on the forums for the tankless water heater, you might do so. There have been quite a few threads with a lot of conversation.
The link above is the manufacturers website complete with instruction video and contact information. Reports from several forums members is very positive when they have called their service dept. From a piece/part that has malfunctioned (Girard has been very responsive in sending replacement parts) to walking people through how to find the elusive "reset" button.
I hope this helps. Our success with the system has been unwavering and I believe it can be for all. It's different and adjusting/setting for temp has a learning curve.
If you don't find your answers in the threads and still have questions feel free to pm me.
Think warm,
Darrell
__________________
Darrell, Mary & K.C. Toller Mix
In our hearts: Goldens, Tess & Jericho
'15 Jayco Precept 31 UL "Bertha"
'13 Wrangler Sahara...AKAFUN
Roadmaster base plate
Ready Brute Elite towbar and brake combo
D&MAKAFUN is offline   Reply With Quote
Old 10-31-2014, 01:58 PM   #20
Senior Member
 
bgermane's Avatar
 
Join Date: Apr 2012
Location: Southern California
Posts: 171
Our problem was with the original Girard units that did not have the adjustable dial. It had a high/low setting. Unfortunately, that did not offer the user enough adjustment to compensate for all the variable conditions, i.e., flow and incoming water temp. Since my original post, I have switched to the newer model with the dial. I have not had an instance when I could not achieve a satisfactory setting.

As others have posted, set the temp with the hot valve completely open and the cold closed. If the temp is comfortable, then there is no reason the unit should limit or cycle. If it does, there may be a problem with the unit that Girard can help resolve. I would highly recommend dealing with Girard directly. Jayco was of very little assistance throughout my ordeal. Girard, on the other hand, was fantastic.

The only Problem that I still encounter results from a sudden loss in pressure which creates a sudden drop in flow. That will cause the unit to limit, but has only happened to us at one campground.
__________________

__________________
Brian, Mary, kids, beagle - Moose, and mutt - Maggie.
2012 Greyhawk 31FS
2013 Ford Explorer Toad
bgermane is offline   Reply With Quote
Reply

Thread Tools
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


» Virginia State Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -6. The time now is 03:43 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Copyright 2002-2016 Social Knowledge, LLC All Rights Reserved.