Heatilator electronic ignition not lighting

[jdavidbakr]

Hi, I have been searching for an answer to this and have drawn a complete blank, hoping someone here can help. I have a Heatilator GBST4336I that is about 10 years old. Last year I had issues with it staying lit, so as we entered this season I decided to troubleshoot it. I first replaced the pilot assembly (part number 2090-013) but that did not solve the issue, so I also replaced the control unit (Dexen GM-6KA). Now it works great ... if it lights. When I turn the switch on, the spark works great on the igniter, but there is a sputtering blue flame - like there's not enough gas coming out - and it never really ignites. Sometimes after 2-3 attempts it will ignite, and then once that happens everything works great. But if it's been off for more than a couple of hours, it goes back to the sputtering pilot flame. This was never an issue before - it never struggled to light, even after being off all summer, it only struggled to stay lit. Now I have the opposite problem.

I can't really find this issue described but I have to think it's fairly common and there should be something I can look at! Does anyone have any ideas on where my next troubleshooting step should be? Is it possible I bought a bad pilot assembly?

Thanks!

 

[DAKSY]

Pull the burner & remove the burner orifice.
Run a cotton swab or something similar into the tube behind the orifice.
You might have a spider's nest in the gas tube.

 

[jdavidbakr]

Thanks - I will give that a try and let you know how it goes. I also was wondering if maybe I got some dust clogged into the new tube when I installed it? Is it safe to use compressed air to blow through the tube or would I risk making it worse??