Water Heaters - Watercraft hot Water heater - Pilot goes off

have a WaterCraft Hot Water heater, gas setup. The pilot light goes off about once a week or few days.

I replaced the Thermocoupe (spelling?) and that did not fix it. No water dripping or any drafts around... I light the pilot, the burner kicks in and then several days later, I'm relighting the pilot as there's no hot water.

Yikes!!!!! could use some advice.

Hello snow_flake_2002 and Welcome to our Do It Yourself Web Site and the Water Heaters topic.

Be sure the pilot flame is all blue and no yellow. If any yellow or doubt pilot flame is correct or maybe dusty, blow it out. Allow it to cool. Use can of computer keyboard canned air cleaner to blow out the entire assembly. Same may apply to the burners orifice and or burner.

To determine this, it takes a trained eye on the effects with the pilot and burner in full operation. Also a visual inspection while the heater is in operation, so the flame sizes and charactoristics can be observed.

The pilot flame must be all blue as well as the burner flame. If there is yellow anywhere in either or both of them, that is an indication of a restriction which must be cleared out.

Removal of the entire burner assembly is required in most cases. The pilot assemble is a part of the assembly. Removal of the assembly removes both. Both have to be disasembled, cleaned out as needed, reasembled and reinstalled exactly as found.

Regards & Good Luck. Sharp Advice
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Thanks! Took apart the burner and cleaned out all lines - looks good so far...