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#926365 - 11/06/17 12:38 PM New thermocouple for water heater concern
rfm3 Offline
The Duke of Dremeland aka The Sagely One
Carpal Tunnel

Registered: 05/30/04
Posts: 33710
Loc: Soon to be in the US version o...
Just replaced the thermocouple on gas fired water heater because the old one would not keep pilot light lit.

Is there a certain distance the end of couple should be from the other part beside it?

I cleaned out all the stuff from under the tank and the burner plate so nothing in there I can see.

It lights up fine, but I can see the tip of the couple is red...and a lot of heat seems to be generated from the area all the piping is by the little hatch way.

The tank may of been cold all night. Not sure. Had hot water last night, wife went to take bath, no hot water, and the tank was cold with no pilot light.

also a bit of sizzling noise like water on a hot spot but no water leakage anywhere

Update: OK shut it all down, removed, adjusted the thermocouple because the package says flame to cover 3/8 in of it...

Now it seems to not glow red, and not sure how the flame should be looking from the burner, kind of yellow with a tinge of blue?

Still hear sizzling which when I took out the unit, the plate was a bit wet, no water dripping, but damp in the inside tube thing..

may be time to look to replace.?

Edited by rfm3 (11/06/17 01:27 PM)
Coming back to where you started is not the same as never leaving

#926398 - 11/07/17 12:33 AM Re: New thermocouple for water heater concern [Re: rfm3]
RCovell Offline
Carpal Tunnel

Registered: 09/27/03
Posts: 6605
Loc: Jayhawk Land
In my experience, the water heater main burner flame should be as blue as possible, with maybe a slight yellow tip. If your's isn't mostly blue, your air vent feeding the burner may be out of adjustment.

I've started up new water heaters and often get a sizzling sound. I have even read in the manual that condensation in the heater chimney can drip back onto the burner plate and make the sound. Nothing to worry about and will go away pretty quickly.

If it doesn't, you might have a leak from the tank.

Good luck, Bob.


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