Gas Valve doesn't open fast enough

[supertek65]

could the space be in a negative pressure????????

is your venting negative??

looks like you covered everything?? maybe venting or combustion air????

[Chris_Worthington]

Ran fine with what has been there for 6 years.... and now there is a need for change in design?

Could it be that this thing is on crack? as in?

[furnacemaninc]

I had this same problem on a pg8 a couple years ago, i ended up moving the HSI a little closer at a slight angle to the burner and it started lighting perfectly. To reason with it i figured vibration might have moved the bracket

[landolb]

Just recently went to a gas furnace training for carrier, and they gave us a story on that. the guy had took the manifold out and hooked it up to a water hose to check if all the water was coming out evenly on each orifice. never heard this method before but sounds like another way of checking a clogged manifold or orifices...
..

[Glennhvac]

Just recently went to a gas furnace training for carrier, and they gave us a story on that. the guy had took the manifold out and hooked it up to a water hose to check if all the water was coming out evenly on each orifice. never heard this method before but sounds like another way of checking a clogged manifold or orifices...
..

Leave it to a training center to come up with this scheme. I have no doubt it would work but yikes!

[joemach]

I had the exact same problem on a Payne about 3 months ago. Don't remember the Model#.

Anyway, change the Hot Surface Igniter (HSI). What was happening for me was that the glow on the HSI would go out before the gas valve would open, hence no ignition. Replaced the HSI and all worked fine. No call back in 3 months.

Hope that works for you.

[gravity]

i have also had weak HSI that wasnt hot enough to ignite the fuel. i have also had them that go out right before the gas valve opens.

[joemach]

i have also had weak HSI that wasnt hot enough to ignite the fuel. i have also had them that go out right before the gas valve opens.

Thats exactly what was happening to me.

Need to get an OEM. Universal would not work.

[gravity]

really!? thats strange. what make and model furnace would it not work with?

[gravity]

these are the important things to right down in my little book...lol

this one will go next to the line that saids "dont forget to put plug back in gas valve after checking propane pressure".....imagine what happened next.

[joemach]

really!? thats strange. what make and model furnace would it not work with?

Don't remember the Model#, but it was a Payne. All I remember it had 2 venturi tubes 50-60k most likely.

[gravity]

i believe the 50-60 is 3 burners. usually 20k per burner. i would say it was a 40,000.

[joemach]

i believe the 50-60 is 3 burners. usually 20k per burner. i would say it was a 40,000.

You know, now that you mention it, you are probably right. This was in the attic furnace. He had 2 systems, so he most likely had a 40k + 40k.

[beenthere]

these are the important things to right down in my little book...lol

this one will go next to the line that saids "dont forget to put plug back in gas valve after checking propane pressure".....imagine what happened next.

Thats something you generally only forget to do once.

[joemach]

Thats something you generally only forget to do once.

I've only done it once. That was enough. "Why do I smell gas?" ... "Oh. darn!"

"Reminder to self ..."

"Replace plug before firing furnace up!!!"

[btuhack]

Thats something you generally only forget to do once.

I have a "friend" that has done that more than once.

[beenthere]

I have a "friend" that has done that more than once.

LOL... ok, some people need to do it more then once to learn their lesson.

Myself, once was more then enough.