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I have a Gibson furnace model kg7sa090c-24b and the code on…

Customer Question
I have a Gibson...

I have a Gibson furnace model kg7sa090c-24b and the code on circuit board keeps flashing pressure switch pressure switch circuit board and inducer assembly are new have any ideas?

Contractor's Assistant: Did you check the furnace's filters?

Yes

Contractor's Assistant: Do you plan on doing the work yourself?

Yes

Contractor's Assistant: Anything else we should know to help you best?

Furnace Is only six years old it runs sometimes for a day then goes out

Submitted: 7 months ago.Category: HVAC
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Answered in 9 minutes by:
12/14/2017
HVAC Technician: Rick, HVAC Supervisor replied 7 months ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,398
Experience: 40+ yrs. experience as a licensed oil & gas technician.
Verified

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

Given all you've replaced the only things left are a problem with the exhaust vent or possibly the switch vac tube connection at the draft assembly port is blocked

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Customer reply replied 7 months ago
Actually removed flue pipe chimney and pipe are clear and I ran wire through port on inducer
HVAC Technician: Rick, HVAC Supervisor replied 7 months ago

Since this is an 80+ not a 90+ unit condensate back up wouldn't be an issue. I got nothing else.

I'm going to open this up to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.

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HVAC Technician: HvacmanSean, HVAC Technician replied 7 months ago
HvacmanSean
HvacmanSean, HVAC Technician
Category: HVAC
Satisfied Customers: 238
Experience: Owner HVAC company
Verified
Good morning. Are you still needing assistance. I can see if i can help
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Customer reply replied 7 months ago
I still need help
HVAC Technician: HvacmanSean, HVAC Technician replied 7 months ago
Alright. Lets start from beginning it will be easier and make sure i dont miss.anything.What Was orginal issue and what did you do.Ill spend some time with you regarding this. Please be patient wkth me at times as i am still active in the field so there may be a slight delay.
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Customer reply replied 7 months ago
Original issue was code on board showing pressure switch. Changed switch worked for awhile. Draft inducer was really noisy changed that then was told circuit board might have short so changed that. Checked voltage at pressure switch I have 25 volts at switch then when draft inducer starts voltage drops out but code on board still flashes pressure switch
HVAC Technician: HvacmanSean, HVAC Technician replied 7 months ago
If your voltage is dropping at pressure swith then thats fine.Ok next step what diagnostic led are you going off. The new control board or old from control board before. They often change
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Customer reply replied 7 months ago
New control board
HVAC Technician: HvacmanSean, HVAC Technician replied 7 months ago
Does it immediately say pressure switch or does it Run normally until it faults out ?
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Customer reply replied 7 months ago
Sometimes immeadiatly sometimes works for awhile before dropping out
HVAC Technician: HvacmanSean, HVAC Technician replied 7 months ago
Have you went across pressure switch and see it drop out or only going by control board ?
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Customer reply replied 7 months ago
My checking has been at pressure switch
HVAC Technician: HvacmanSean, HVAC Technician replied 7 months ago
you have seen it go from 0 to 25 volts at pressure switch ? While it ead running
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Customer reply replied 7 months ago
No I have voltage at pressure switch,when inducer starts and pressure switch opens voltage drops out like it’s supposed to but circuit board flashes pressure switch problem
HVAC Technician: HvacmanSean, HVAC Technician replied 7 months ago
2 pressures switches on this model ?
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Customer reply replied 7 months ago
No just one
HVAC Technician: HvacmanSean, HVAC Technician replied 7 months ago
Can you attach a picture of wiring diagram so i can see it
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Customer reply replied 7 months ago
May not be able to get it till tomorrow
HVAC Technician: HvacmanSean, HVAC Technician replied 7 months ago
Ok.
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HVAC Technician: HvacmanSean, HVAC Technician replied 7 months ago
Havent heard back on this?
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