GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.

Home » Public Forums » GMCnet » Propane water heater (Ignition short issue?)
Propane water heater [message #249423] Sun, 11 May 2014 12:33 Go to next message
dpottebaum is currently offline  dpottebaum   United States
Messages: 100
Registered: January 2013
Location: Bondurant, Iowa
Karma: 0
Senior Member
I've got a 1978 Royale with a propane water heater. I think it's original. When I hit the ON switch under the sink the light flashes on, there's a noticeable "click" and then the light turns off. It seems to be a short or over ride safety maybe? Anyone ever had this issue? The engine pre-heat works and the tank holds water, but I can't get the propane side to work because of this issue. The PO had the in-line fuse up in front by the battery pulled out so it's likely been an issue for a while. Thanks in advance for your help.

Dave Pottebaum Bondurant, Iowa 1978 Royale
Re: [GMCnet] Propane water heater [message #249424 is a reply to message #249423] Sun, 11 May 2014 12:46 Go to previous messageGo to next message
emerystora is currently offline  emerystora   United States
Messages: 4442
Registered: January 2004
Karma: 13
Senior Member
That's usually an indicator that it didn't light or didn't light long enough. There should be a thermocouple in the flame that has to get hot to keep the propane valve open. The thermocouple might be bad but more likely the pilot light might not get hot enough due to a clogged jet or a rust flake lying on top of it.

Blow out the area with an air jet and then remove the jet from the end of the tube and clean it out. It is common for little spiders who seem to live the smell to build their webs inside the burner orifice.

Emery Stora

> On May 11, 2014, at 11:33 AM, Dave Pottebaum wrote:
>
> I've got a 1978 Royale with a propane water heater. I think it's original. When I hit the ON switch under the sink the light flashes on, there's a
> noticeable "click" and then the light turns off. It seems to be a short or over ride safety maybe? Anyone ever had this issue? The engine pre-heat
> works and the tank holds water, but I can't get the propane side to work because of this issue. The PO had the in-line fuse up in front by the
> battery pulled out so it's likely been an issue for a while. Thanks in advance for your help.
> --
> Dave Pottebaum
> Bondurant, Iowa
> 1978 Royale
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

Re: [GMCnet] Propane water heater [message #249425 is a reply to message #249424] Sun, 11 May 2014 12:52 Go to previous messageGo to next message
dpottebaum is currently offline  dpottebaum   United States
Messages: 100
Registered: January 2013
Location: Bondurant, Iowa
Karma: 0
Senior Member
well, that sounds easy enough! Thanks Emery!

Dave Pottebaum Bondurant, Iowa 1978 Royale
Re: [GMCnet] Propane water heater [message #249440 is a reply to message #249424] Sun, 11 May 2014 16:13 Go to previous messageGo to next message
dpottebaum is currently offline  dpottebaum   United States
Messages: 100
Registered: January 2013
Location: Bondurant, Iowa
Karma: 0
Senior Member
Just a quick follow up. Emery, your advice worked like a charm. We now have hot water! Thank you!

Dave Pottebaum Bondurant, Iowa 1978 Royale
Re: Propane water heater [message #254652 is a reply to message #249423] Mon, 07 July 2014 21:01 Go to previous messageGo to next message
dpottebaum is currently offline  dpottebaum   United States
Messages: 100
Registered: January 2013
Location: Bondurant, Iowa
Karma: 0
Senior Member
Well, we had hot water for a couple outings. Now something new is happening. When I turn on the water heater it clicks, the ignition lights the burner, the heater runs for about 10 seconds and then shuts off. The ignition clicks rapidly about 5 or six times and then the light comes on indicating a failure to ignite. I cleaned the thermocouple and repeated. problem persisted. Is there another part of the system causing this problem, or is it still tied to the thermocouple?

Dave Pottebaum Bondurant, Iowa 1978 Royale
Re: Propane water heater [message #254656 is a reply to message #249423] Mon, 07 July 2014 21:26 Go to previous messageGo to next message
Steve is currently offline  Steve   United States
Messages: 506
Registered: September 2013
Location: East Greenville, Pa
Karma: 1
Senior Member
Dave,
I have had a similar problem with the propane hot water heater in my 78 Royale. I get no light or clicking when I engage the switch. All fuses in the fuse blocks are good. I was not aware of the inline fuse near the battery that was mentioned. I will have to track that down and check it. My specific heater has as "Pilot" setting on the control knob. I have been able to set it to pilot and manually light it with lighter. Once lit, the pilot stays on and the heater functions as normal and cycles on and off when needed. I am just not able to light it from inside the coach. It is on my list of things to figure out. I don't know of any harm in lighting it manually, just inconvenience. My understanding is that some models are electronic ignition and do not have a pilot light.


1978 GMC Royal
Eastern Pennslyvania
1968 Chevrolet C20 396 Camper Special
1969 Chevrolet C20 Camper Special
1985 Buick Electra Park Avenue
1992 Camaro 25th Anniversary Heretage Edition Black
Re: [GMCnet] Propane water heater [message #254658 is a reply to message #254652] Mon, 07 July 2014 21:39 Go to previous messageGo to next message
emerystora is currently offline  emerystora   United States
Messages: 4442
Registered: January 2004
Karma: 13
Senior Member
Remove the jet from the end of the flame tube and clean it out.
It could be a small spider or some dirt

Emery Stora

> On Jul 7, 2014, at 8:01 PM, Dave Pottebaum wrote:
>
> Well, we had hot water for a couple outings. Now something new is happening. When I turn on the water heater it clicks, the ignition lights the
> burner, the heater runs for about 10 seconds and then shuts off. The ignition clicks rapidly about 5 or six times and then the light comes on
> indicating a failure to ignite. I cleaned the thermocouple and repeated. problem persisted. Is there another part of the system causing this
> problem, or is it still tied to the thermocouple?
> --
> Dave Pottebaum
> Bondurant, Iowa
> 1978 Royale
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

Re: [GMCnet] Propane water heater [message #254675 is a reply to message #254658] Tue, 08 July 2014 07:09 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
To clean the jet, use only air, liquid, or a nylon mono filament line -- NO
metal!

Ken H.

On Mon, Jul 7, 2014 at 10:39 PM, Emery Stora wrote:

> Remove the jet from the end of the flame tube and clean it out.
> It could be a small spider or some dirt
>
> Emery Stora
>
>> On Jul 7, 2014, at 8:01 PM, Dave Pottebaum wrote:
>>
>> Well, we had hot water for a couple outings. Now something new is
> happening. When I turn on the water heater it clicks, the ignition lights
> the
>> burner, the heater runs for about 10 seconds and then shuts off. The
> ignition clicks rapidly about 5 or six times and then the light comes on
>> indicating a failure to ignite. I cleaned the thermocouple and
> repeated. problem persisted. Is there another part of the system causing
> this
>> problem, or is it still tied to the thermocouple?
>> --
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist



Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: Propane water heater [message #254760 is a reply to message #249423] Tue, 08 July 2014 19:30 Go to previous messageGo to next message
dpottebaum is currently offline  dpottebaum   United States
Messages: 100
Registered: January 2013
Location: Bondurant, Iowa
Karma: 0
Senior Member
Thanks guys. I'll give that a try tonight.

Dave Pottebaum Bondurant, Iowa 1978 Royale
Re: Propane water heater [message #254797 is a reply to message #249423] Wed, 09 July 2014 05:16 Go to previous messageGo to next message
dpottebaum is currently offline  dpottebaum   United States
Messages: 100
Registered: January 2013
Location: Bondurant, Iowa
Karma: 0
Senior Member
The water heater is functional again! I cleaned it as you suggested, but I didn't notice any debris. On the day I had trouble with it we had received 2 1/2 inches of rain and it was super humid out side. Not sure if that could mess with things or if the trip home cleared up the problem. Regardless, its working again and I appreciate your help very much.

Dave Pottebaum Bondurant, Iowa 1978 Royale
Re: Propane water heater [message #254798 is a reply to message #249423] Wed, 09 July 2014 05:17 Go to previous message
dpottebaum is currently offline  dpottebaum   United States
Messages: 100
Registered: January 2013
Location: Bondurant, Iowa
Karma: 0
Senior Member
The water heater is functional again! I cleaned it as you suggested, but I didn't notice any debris. On the day I had trouble with it we had received 2 1/2 inches of rain and it was super humid out side. Not sure if that could mess with things or if the trip home cleared up the problem. Regardless, its working again and I appreciate your help very much.

Dave Pottebaum Bondurant, Iowa 1978 Royale
Previous Topic: [GMCnet] Eliminating Vapor Lock
Next Topic: cool hot wheel setup
Goto Forum:
  


Current Time: Wed Nov 20 10:12:06 CST 2024

Total time taken to generate the page: 0.08453 seconds