Pilot light almost goes out when it turns on


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Old 03-04-18, 09:33 AM
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Pilot light almost goes out when it turns on

I've got a rental with a Bradford White water heater from 1999. It's old but I was hoping to get a little more life out of it since I just spent $6,000 rehabbing the place!

I haven't gone out to see it in person yet but this is how they describe it. Pilot light seems to be lit. When the water heater turns on they hear a click and the pilot light almost goes out and the burner doesn't light. Pilot light never goes out all the way.

Before I headed out I was hoping to get some ideas of what to check. Pilot light orifice clogged? Filter under water heater dirty? Any tips appreciated.
 
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Old 03-04-18, 04:31 PM
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Here's a video of it. The first click is me turning the temp dial up and you an hear it click on and hear the gas being delivered. The second click is me turning the temp dial back down which makes the burner light for a second. Then I do the same thing over again.

I took the whole burner assembly out and cleaned everything, didn't seem to help.

https://www.youtube.com/watch?v=1UBDnymx5i4
 
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Old 03-04-18, 08:16 PM
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It looks like the resting pilot is too small to keep the valve fully opened.
The normal pilot must engulf the thermocouple fully in order to heat it hot enough.

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Old 03-04-18, 08:19 PM
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What would need to be replaced to fix it? The pilot assembly? Gas valve?

And I can hear gas running when it clicks on...if it was the thermocoupler....wouldn't it not let any gas out?
 
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Old 03-04-18, 09:04 PM
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I'm not really sure. I'd try cleaning the pilot orifice first.
 
 

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