RV.Net Open Roads Forum: Tech Issues: Water heater won't light.

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Help and Support  |  Contact

Search:   Advanced Search

Search only in Tech Issues

Open Roads Forum  >  Tech Issues

 > Water heater won't light.

This Topic Is Closed  |  Print Topic  |  Post New Topic  | 
Page of 3  
Prev  |  Next
Sponsored By:
visch1

CAPE COD, MA

Senior Member

Joined: 05/04/2008

View Profile



Posted: 05/21/12 06:09am Link  |  Print  |  Notify Moderator

Might it be a bad thermostat on the tank in the open position?

evergladesgator

South Florida

Senior Member

Joined: 08/16/2004

View Profile



Good Sam RV Club Member

Offline
Posted: 05/21/12 07:20pm Link  |  Print  |  Notify Moderator

On my old 75 Champion (Hunt Camp) it has the old style manual rotating button for OFF-ON-PILOT.
If the pilot stays lit and BURNER DOES NOT COME ON IT IS THE THEROCOUPLE ! The thermocouple generates it's own electric charge to open the gas valve. Change the thermocouple. It only costs a few bucks. I'm positve it will work.


gator
2000 F250 Super Duty 7.3 PSD.
1999 Skyline 2427 Nomad 5th wheel.Rancho 9000s, Prodigy, Me, wife & two spoiled chihuahuas. PeePee aka Penelope(6/97-7/08) & Hannah. New kid Chiquita aka ChiChi.


Ex-Tech

West

Senior Member

Joined: 08/27/2011

View Profile



Posted: 05/21/12 11:21pm Link  |  Print  |  Notify Moderator

.

CRAMD

Saskatchewan,Canada

Senior Member

Joined: 11/21/2006

View Profile


Offline
Posted: 05/23/12 08:16pm Link  |  Print  |  Notify Moderator

evergladesgator wrote:

On my old 75 Champion (Hunt Camp) it has the old style manual rotating button for OFF-ON-PILOT.
If the pilot stays lit and BURNER DOES NOT COME ON IT IS THE THEROCOUPLE ! The thermocouple generates it's own electric charge to open the gas valve. Change the thermocouple. It only costs a few bucks. I'm positve it will work.


As I said in a previous posting, the thermocouple on a manual pilot,such as the O.P's, and yours, is a safety for the pilot only.Yes,it generates it's own current, but this serves only to keep the internal valve open for the pilot gas,i.e.,the pilot goes out, thermocouple stops generating current,magnetic pilot valve closes,pilot gas no longer flows.This is why the valve for the pilot gas must be held in until the pilot flame will stay lit on its own;holding the button down bypasses the safety feature on the pilot.
The thermostat is what causes the main burner valve to open, and causes it to close again, when heat from the main burner is no longer required.
How do I know this for sure?? I worked for a natural gas utility for 36 years, and have had training in the maintenance and trouble shooting of gas fired appliances.





Gsturner

Faucett, MO

Senior Member

Joined: 08/09/2010

View Profile



Good Sam RV Club Member

Offline
Posted: 05/24/12 10:00am Link  |  Print  |  Notify Moderator

--deleted by OP--

* This post was edited 05/24/12 10:31am by Gsturner *


2007 Titan LE with the Big Tow Package
2010 Rockwood 8315BSS
2008 Suzuki GZ 250-Response to 3/4 Life Crisis


Gsturner

Faucett, MO

Senior Member

Joined: 08/09/2010

View Profile



Good Sam RV Club Member

Offline
Posted: 05/24/12 10:14am Link  |  Print  |  Notify Moderator

I returned the 18" thermocouple to the dealer unopened. CRAMD seems to have the best answer here so far. Unfortunately, I still haven't gotten the main burner to fire. Last season, sliding the thermostat lever back and forth a bit got it going. No such luck this time. Assuming I can locate an exact replacement,is replacing the controller/valve a reasonable DIY project?

ShapeShifter

Buffalo, NY

Senior Member

Joined: 04/03/2007

View Profile



Posted: 05/24/12 10:28am Link  |  Print  |  Notify Moderator

Gsturner wrote:

Last season, sliding the thermostat lever back and forth a bit got it going. No such luck this time.

This makes it sound like a bad thermostat to me. When it was failing, moving the lever back and forth would occasionally make it operate and turn on the flame. But at this point it may be too far gone and even that doesn't help. Sounds to me like a new thermostat might be in your future...


2007 Holiday Rambler Endeavor 40PDQ LE
400 ISL Cummins/Allison
2013 Ford F-150 FX4 toad

Inside: Him, Her, and a pack of little furballs...


CRAMD

Saskatchewan,Canada

Senior Member

Joined: 11/21/2006

View Profile


Offline
Posted: 05/24/12 10:59pm Link  |  Print  |  Notify Moderator

Gsturner wrote:

I returned the 18" thermocouple to the dealer unopened. CRAMD seems to have the best answer here so far. Unfortunately, I still haven't gotten the main burner to fire. Last season, sliding the thermostat lever back and forth a bit got it going. No such luck this time. Assuming I can locate an exact replacement,is replacing the controller/valve a reasonable DIY project?


Replacing a gas valve is not a big project,provided you know what you are doing,such as having the proper tools, knowing how tight you can turn a pipe nipple/fitting in to the valve without either being too loose, or worse, running it in too far and splitting something, making sure you have a replacement valve suitable for the unit it is going on etc..
The other thing to consider, is will you be able to purchase a valve; for domestic plumbing of gas appliances,many supply places will not sell replacement parts to anyone but a licensed plumber. Just a few things to consider.

CRAMD

Saskatchewan,Canada

Senior Member

Joined: 11/21/2006

View Profile


Offline
Posted: 05/24/12 11:17pm Link  |  Print  |  Notify Moderator

ShapeShifter wrote:

Gsturner wrote:

Last season, sliding the thermostat lever back and forth a bit got it going. No such luck this time.

This makes it sound like a bad thermostat to me. When it was failing, moving the lever back and forth would occasionally make it operate and turn on the flame. But at this point it may be too far gone and even that doesn't help. Sounds to me like a new thermostat might be in your future...


A new thermostat MAY be the cure.
I dug out my gas fitter's reference book, with flowcharts for troubleshooting, and had a quick look to see what it had to say.
Three things are listed for no hot water because the main burner is inoperative, starting with a plugged orifice,then defective gas valve (this one I covered in a previous post), and last, low inlet gas pressure (probably unlikely).
With reference to thermostats, check for loose or broken wires.
I would start by checking for a plugged orifice or burner tube (spiders/mud daubers etc.)then look for loose wires on the thermostat, or possibly corroded terminals on the gas valve itself.If none of this works,you should get professional help.

Gsturner

Faucett, MO

Senior Member

Joined: 08/09/2010

View Profile



Good Sam RV Club Member

Offline
Posted: 05/25/12 08:03am Link  |  Print  |  Notify Moderator

Okay--already blew everything out. Lots of dust and a few dry wings, but nothing substantial. This is a very plain-jane set up. There is a lever on back of the gas control valve that I am assuming is the temp setting (thermostat)--that's what I slid last season with success, currently with no effect. The only thermostat inside the trailer is for the furnace. There are no wires anywhere around the gas control valve on the water heater. BTW, in my efforts, I walked away and left the pilot light on--stayed on thru two very windy days and nights. But, alas, still no main burner. I have an appointment after the holiday at Liberty RV to replace the gas control valve.

This Topic Is Closed  |  Print Topic  |  Post New Topic  | 
Page of 3  
Prev  |  Next

Open Roads Forum  >  Tech Issues

 > Water heater won't light.
Search:   Advanced Search

Search only in Tech Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:

© 2014 RV.Net | Terms & Conditions | PRIVACY POLICY | YOUR PRIVACY RIGHTS