Pg9maa-high carbon monoxide reading

JSCOTTYB

I am getting a reading of 1000ppm in between houses. they are less than 3 ft. apart. the exhaust venting appears not to be blowing very hard yet still manages to function. would have thought it would have gone out on pressure. very acidic smell
at front of house. Could this be a inducer motor issue.( not going out on pressure) ???? I am going to remove it tomorrow to check it out. Also, if capacitor is toasted it should kick out on pressure as well.(correct)? Any support would be appreciated as Payne is not a familiar product for me. I know they are all very similar, but hopefully you have more knowledge on this product than I do.


CURIOUS TECH.

HVACDave

Is there any airflow between the houses or are there fences etc. that are limiting air movement? Is this a 1 pipe, 2 pipe (or coincentric) instalation? Does the exhaust vent push straight accross towards the other house or is it angled towards the open area between the houses?

how

1000 ppm in the open air between houses or from the exhaust outlet??
Are you getting a CO count in the furnace plenum?
When was the last time your co detecter was calibrated?

Age & model of the Payne would help.

Yes the pressure switch would be locking out the furnace with an inducer/capaciter failure. Do you have a blinking led diagnostic light on the furnace? Has the furnace been locking out?

Marty S.

A 1000 ppm outside? That furnace better be shut off right now. Excess fuel, not enough combustion air,broken or plugged heat exchanger are all prime causes of high CO in the flue gas.

JSCOTTYB

1-single pipe
2-approx 10 yrs
3-nothing in plenum
4-pg9maa036080

agree about lack of combustion air and fuel mix.also heat is not quite the same in the house although furnace runs for a
long time.

Will let you know what i find!

TY FOR ANY HELP YOU HAVE GIVEN

yuri

Is it burning nat gas or propane? check the hose on the burner box that attaches to the gas valve to make sure it is intact and not cracked/leaking. it modulates the gas pressure. did U check the manifold pressure? pull the blower and look for water on the secondary exchanger as they had lots of failures of them. that may be the real problem.

__________________
"Cut it twice and it is still too short".
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

JSCOTTYB

Pulled venting apart(no blockage). Removed inducer motor and ran it while removed(more air flow thru inducer was obvious).....blocked exchanger diagnosed! Change exchanger or furnace replacement....customers choice! Exchanger may be under warranty but labour is extra.

Thank you for your assistance guys! Ttyl :d

yuri

Hate to be negative but obviously it will move more air when disconnected. It is designed to work against a properly sized vent system. We use a differential manometer to check flow thru a heat exchanger and the pressure switch prevents it from firing when it is too low or blocked. Hope you don't get burned on a misdiagnosis.

__________________
"Cut it twice and it is still too short".
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

JSCOTTYB

ALREADY CHECKED ALL YOU RECOMMENDED BEFORE HAND. TALKED TO TECH SUPPORT ABOUT READINGS JUST TO BE SURE AND THEY ALSO
FIGURED IT WAS A BLOCKED EXCHANGER! THE OLDER PAYNES HAVE VERY SMALL PART OF THE EXCHANGER ON THE BOTTOM. THIS IS LIKELY WHERE IT'S BLOCKED. AND YES I AGREE ABOUT GOING OUT ON PRESSURE. I APPRECIATE YOUR ASSISTANCE THOUGH!