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tom_41

anywhere USA

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Posted: 08/03/12 06:08pm Link  |  Print  |  Notify Moderator

I am in the vmarket for a used class c motorhome. I went today to look at one that was advertized on craigslist. It really looked good, drove really well, good rubber and a good floorplan that we liked. So far the only thing I have found wrong and kept me from buying it today was the water heater. It works fine on electric, but with the water cold in the tank, when I hit the inside switch for propane, it came on quick, and with plenty of pressure, and has a very blue flame, no yellow at all. But it will only stay on for about 15-20 seconds then cut off like it was hot water. then it will try a 2nd and 3 time. always a powerful blue flame and cuts off in 15-20 seconds. What would be causing this? the poor guy that owns it has no idea nor do I. any help or suggestions please?
thanks

pulsar

Lewisville, NC

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Posted: 08/03/12 06:47pm Link  |  Print  |  Notify Moderator

Moved from Forum Technical Support to Tech Issues.

robatthelake

Vancouver Island

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Posted: 08/03/12 07:44pm Link  |  Print  |  Notify Moderator

There really isn't that much that goes wrong with Water Heaters . As long as it isn't leaking it can be easily and relatively inexpensive to repair!

Hold out for $100 Off and if the rest looks good go for it!


Rob & Jean
98 Dutch Star Diesel Pusher ..07 Honda CRV AWD


enblethen

Moses Lake, WA

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Posted: 08/03/12 07:23pm Link  |  Print  |  Notify Moderator

It could be a bad ECO. Next could be corrosion on the circuit board connector or gas valve ground connection.
It would be good to know make and model of water heater.


Bud
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tom_41

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Posted: 08/04/12 04:12am Link  |  Print  |  Notify Moderator

after trying the gas, then we turn it on electric, and while looking over the coach, for over 2 hrs we tried the water (he had it hook up to electric & water) the water was getting hot. Where is the thermocouple located? and would it be easy to get to? and how would I go about cleaning it? thanks again
Tom

Old-Biscuit

Verde Valley

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Posted: 08/03/12 08:42pm Link  |  Print  |  Notify Moderator

Could be thermocouple is dirty......it's the flame prover that holds gas valve open.

You said it works on electric...........how do you know?
You stated water in tank was cold when you tried gas.


2007 RAM 3500 QC LB SRW 5.9L CTD 48re 4:10 4K in bed 'quiet genny'
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Hit the Road Debt Free & Clear April '07
Came off the road still Debt Free & Clear Jan. '14


enblethen

Moses Lake, WA

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Posted: 08/04/12 07:17am Link  |  Print  |  Notify Moderator

You do not have a thermal couple. There is a flame sensor. It is located in the burner area. It could be part of the ignitor depending on make and model. It looks like another piece of wire about 1/8 inch in diameter. This wire sends a signal to the circuit board.
I would start by cleaning the four wire connector.

enblethen

Moses Lake, WA

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Posted: 08/04/12 12:15pm Link  |  Print  |  Notify Moderator

Flame sensor would normally shut down quicker then 15-20 seconds.
You could jumper around the ECO and the thermostat for testing.
There is also a thermal fuse located under the tubing adjacent to the ECO/Thermostat.
I doubt whether it is the flame sensor.
Look at your furnace and refer circuit boards. They maybe the same board and you could exchange them to see if problem goes away.
Did you clean the four wire connector?
There is water in tank?

tom_41

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Posted: 08/04/12 05:33pm Link  |  Print  |  Notify Moderator

there is water in the tank. I did not clean the 4 wire connector, but will do that. I did go ahead and buy the unit. It has the suburban dsi water heater and I have check on the type of module board if I have to have one. They range from $81.00 up to $183.00 for the #520814 board. That is on internet. havent check the local Rv places here yet. But I have never put on a module board but will sure give it a try . couldnt be to hard. I know its at the back end. Can"t find any instructions on internet. Any one know of any instructions? I figure I better learn to do alot of maintance on these things or go broke!lol
thank you enbethen, you have certainly been a big help. You must have a lot of years experience with RV's.
thanks again and wish me luck
Tom

tom_41

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Posted: 08/04/12 12:02pm Link  |  Print  |  Notify Moderator

thank you enblethen!! I have looked this morning and I couldn't find what looked like thermocouple...Sure glad you came by..now I know what to look for. I don't think it could be the gas valve, but I figure it is either a dirthy flame sensor or circuit board. thanks again

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