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Author Topic: Issue With Carrier 58MVP 100 14120  (Read 4739 times)

Offline whitedavidp

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  • Member Since: Jul 2012
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Issue With Carrier 58MVP 100 14120
« on: April 09, 2014, 02:25:54 PM »

Hello. In a rental property I own (used to be our own home) we have a Carrier furnace installed in 1999 which has been really pretty great. A week ago we had a problem where it simply would not start. It would try to do so and then click off in a cycle over and over again.

A technician came and told me that he found 3 different fault codes. If I got it right they pertained to: low fire pressure switch stuck closed, inducer outside valid speed range, and pressure switch calibration fault. He was, however, able to simply cut power to the furnace and when re-applied all was well again. He said this was common place. Since then, our tenant says the furnace has been operating just fine - better than before. Seems odd but there are circuit cards in there and perhaps, like most computers, they require a reboot now and then.

The other thing the technician said was that this furnace is basically at end-of-life which surprised the heck out of me. He said that repairing this would be very expensive and that replacing is likely the thing to do at this point. I have no way to confirm this one way or the other. It just seems a pretty short lifespan for a unit that was so expensive to begin with and that actually sees use less than 1/2 of the year. Maybe these are just not made like they used to be?

I was called by the service company and they are saying the the inducer assembly and the pressure switch assembly would cost over $1900 installed (1-1.5 hours labor). I have no idea what these entail or should cost. But I do know that in 1999 the cost to install the furnace (along with gas meter/pipe, direct venting, etc) was about $5000. I have to guess that it will be more than that now.

So can anyone speak to these issues? Are the parts prices over-stated? Are they even actually needed since the furnace seems fine since its "reboot"? Should the thing be tossed?

Thanks for your viewpoints.

Offline DaleCaskanette

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  • Member Since: Dec 2013
  • Posts: 194
  • Country: ca
Re: Issue With Carrier 58MVP 100 14120
« Reply #1 on: April 27, 2014, 10:22:50 AM »
if the computer sees a problem it locks out and will not start, turning off the power reset the board if it is working now i would not change it.

Offline KeepItSimpleStupid

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Re: Issue With Carrier 58MVP 100 14120
« Reply #2 on: October 10, 2016, 05:06:25 AM »
My personal opinion on this is that two things need to be done to the Carrier system:

1. Install a bidirectional surge suppressor between R and C at the furnace,  The part  (P6KE47C) is under a $1.00.   No polarity.   There's no surge protection except a fuse.  That 50 cent piece IMO can save lots of dollars.

2. The blower motor totally pollutes the power line.  X-10 devices won't function.  e.g.


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