Vacuum issues but only when fire is on?

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St Croix Greenfield (corn burning model). I've cleaned out the system, and when I switch it on (without a fire), it blows well with no vacuum switch error. However, a few minutes after the fire is started, the vacuum error comes on, and refuses to go away. As in, I switch it off and on, but it will no longer start because of the vacuum switch error.

So is there some reason why the vacuum switch will cause issues only when the stove is warm, but not when it is cool? Would replacing the vacuum switch help, or is it likely something else is causing the issue? As far as I can tell the gaskets are in good shape, and it's confusing that there is no vacuum issue detected when there is no fire in the burn pot but only when the fire has been on for several minutes.
 

johneh

Minister of Fire
Dec 19, 2009
4,383
Eastern Ontario
Test the vac switch -- jump the 2 wires together run the stove
and see if your problem has disappeared also clean the vac
hose and nipple into the stove Note make sure the wires
you jump do not touch a ground

Welcome to the forum
 
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johneh

Minister of Fire
Dec 19, 2009
4,383
Eastern Ontario
Thanks, will try it. What is the worst case if I continuously run the stove with the bypassed vacuum switch?
You will then be defeating an important safety switch
Not a good idea
 
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You will then be defeating an important safety switch
Not a good idea
Understood, thanks.
So what I am hearing you say is that if the bypass doesn't cure the error (as in, I still get a vacuum error), then the issue is not with the switch itself, but some other component? Such as wiring to the control box?
And, if the bypass solves the issue (no more errors), then the switch could be defective?

I am still guessing there's no actual vacuum issue, because the error doesn't show up all the time, only when the stove gets warm.
 

johneh

Minister of Fire
Dec 19, 2009
4,383
Eastern Ontario
I have been running a P-43 8 years with the switch jumped
Then Sir you are circumventing an important safety device
If the stove causes a house fire and your insurance company
finds that the switch was by-passed you will be chit out of luck
You have just made the list for a Darwin award.
 
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