Honeywell Q340A 30mV thermocouples

Posted by oparr@hotmail.com on December 25, 2008, 2:43 pm

What's their usual lifetime in a furnace? Darn thing chooses Christmas
morning to die on me. They never seem to last more than 3 years and
this is with the pilot adjusted to minimum.

Posted by The Daring Dufas on December 25, 2008, 3:44 pm

oparr@hotmail.com wrote:

> What's their usual lifetime in a furnace? Darn thing chooses Christmas
> morning to die on me. They never seem to last more than 3 years and
> this is with the pilot adjusted to minimum.

I've seen thermocouples last for the life of
the furnace. Failure could be due to what's
in the air mixing with the flame and corroding
the thermocouple. What color is the pilot flame?
If the thermocouple is cleaned with sandpaper,
it may start working again.

TDD

Posted by KJPRO on December 25, 2008, 3:46 pm

> What's their usual lifetime in a furnace? Darn thing chooses Christmas
> morning to die on me. They never seem to last more than 3 years and
> this is with the pilot adjusted to minimum.

When is my light going to burn out?
If you can answer that, I'll answer your question.

Posted by Don Ocean on December 25, 2008, 3:48 pm

oparr@hotmail.com wrote:

> What's their usual lifetime in a furnace? Darn thing chooses Christmas
> morning to die on me. They never seem to last more than 3 years and
> this is with the pilot adjusted to minimum.

Cute... Residential units haven't had pilots for years. ;-)

Posted by Ed Pawlowski on December 25, 2008, 10:05 pm

> oparr@hotmail.com wrote:

>> What's their usual lifetime in a furnace? Darn thing chooses Christmas
>> morning to die on me. They never seem to last more than 3 years and
>> this is with the pilot adjusted to minimum.

> Cute... Residential units haven't had pilots for years. ;-)

What is so cute?
Many older models are still in existence and heating homes. I know of at
least two.

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