This is a gas wall heater manufactured by Southern Heater Corp, model #135S.
It has a 24.5K BTU output. The pilot lights in the pilot mode. When the knob
is turned to on, it stays lit and the burner ignites. The temperature dial
goes from 1 to 5. Very basic. Once the temperature exceeds the thermostat
setting, the burner stops. So far so good. But when it's time for the burner
to come back on, it doesn't. I noticed that some time during the first few
minutes, the pilot light extinguishes even though the burner is still going
strong. Is this a thermocouple problem? Every time I relight the pilot, the
burner will come on again but minutes later the cycle repeats. I cannot
locate any information on this make or model heater and I was wondering if
parts for this are generic.
Thanks for your reply.
Possibly...might also simply be a partially clogged pilot light orifice
so that it is easily blown out; that was a problem on the basic simpler
heater in the wellhouse spoken of in another thread recently.
Ok, I'll clean out the pilot light orifice and see if that corrects it. If
it turns out that I do need to replace the thermocouple, are there different
types, temperatures, or other parameters I need to consider when buying a
Thanks for your reply.
Unfortunatly it gets down to how old it is and how much a new one
cost. I have a similar gas heater that is 20 years old and cost about
$80 USD back then. Before I'd mess around with finding repair parts I
would replace the whole thing, about $100. repair parts even if you
can DIY may be a significant portion of the cost of a new heater.
On mine its either welded or stamped in. You would have to replace the
whole valve assembly. I had to do this the first year I had it
installed in warranty. The part would have been a very significant
cost of the heater. I assumed this was pretty much the case on all the
wall mounted gas heaters. If its as old as mine 20 years I would still
replace even if the part only cost $10. I always ask myself, " would I
pay X dollars(cost of repair) for a Y old item". Of course the fix may
be as simple as adjusting the position of the TC relative to the flame
or turning up the gas to the pilot. The OP may also be having a
problem when the main burner is turned off it sucks out the flame of
the pilot. The gas guy turned up the pilot to fix this but I later
learned it was an air mixture problem. There was actually a small
explosion that was blowing out the flame whenever it shut off. Last
tech that looked at it turned the pilot down and adjusted the air.That
is pretty much the history of my 20 year old unit. One more problem
and it winds up on the curb.
The "universal" thermocouple kits have all the parts to make them fit
- sometimes takes a bit of grunt-work - and the old unit was well
enough made it will LIKELY still be working when it would be time to
replace the cheap crap you can buy today, the next time.
The last one I repaired, had a safety over-temperature switch wired
into an adapter that slipped into the well in the gas valve where
the threaded connector end of the thermocouple screwed in. The wire
was defective so I removed the adapter and screwed the thermocouple
back in to restore the water heater to operation. The switch looked
like the roll out switch on a gas furnace and it was the first one
I'd seen like that. I don't remember the brand of water heater and
I haven't looked for a replacement because the owner didn't want to
spend any more money. It was just an extra safety added on and for
some reason reminded me of the bolt-on emission controls added to
cars back in the 70's. I've been seeing a lot of safety devices that
are being added to a lot of consumer items that are obviously not a
part of the original design.
In your case, I've seen instances where the thermocouple is not far
enough into the pilot flame and the pilot flame is pulled away from
the tip of the thermocouple by the draft of the main burner. The cure
could be as simple as repositioning the tip of the thermocouple.
I know that every body like to do things them self
one reason it makes you feel good that you achieved something
doing it yourself, and the other it is lot more cost effective meaning lot
However I would not advise anyone full with furnace unless you are sure
that you know what are you doing a few dollars of saving could coast
your life just be a ware of that fact.
we can all say maybe is these or maybe is that and maybe none of us
will be right, on the end best for you will be call person that works with
and be safe.
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