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I have a condensing furnace, MN G51MP- 48C- 090 -06 this…

Customer Question
Hi , i have...

Hi , i have a condensing furnace, MN G51MP- 48C- 090 -06 this furnace gives trouble every year at some point. flash code says condensation is backed up or not enough combustion air or pressure switch is stuck open . I've cleaned out heat exchanger also changed pressure switch have not piped combustion air to outside but it seem's to be enough in the crawl space. any answer's

Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters?

Yes filter is clean , thermostat is calling

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

Yes I'm a service tech.

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

No its baffling

Submitted: 9 months ago.Category: HVAC
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Answered in 3 minutes by:
11/18/2017
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,609
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. First I’ll need some more info so I have a more complete picture of your situation.

What are the dimensions of the space the furnace is in?

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Customer reply replied 9 months ago
Approx. 1500 square ft. Crawl space well ventilated
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago

what's the LED flash sequence?

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Customer reply replied 9 months ago
Red light was off green slow heart beat
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago

Did you clean out the condensate trap and drains?

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Customer reply replied 9 months ago
all drains & heat exchanger
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago

That's all I got. 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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