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First of all, I'm a homeowner not a pro.

A certain amount of resistance is expected in the PVC pipe inlet, and the inducer fan is adjusting its speed according to this, so:
- piping should be...

Southern California? I'm a homwowner not a pro, but definitely an 80% efficient unit for that warm climate.

Have you considered the two stage, two speed Rheem 80% unit "Criterion II Plus 2 80%...

It's very expensive to buy parts plus service calls are very expensive for any furnace. 9% of the purchase price for 10yrs parts/labor seems like a good bet to me on this product.

Pull the front...

Great suggestions. I really appreciate all the ideas. I will indeed print this and
give it to the tech to help us figure this out.



Thanks for the fault code instructions. I do have them...

Model 58MVP080-14114
Series 140
Serial 350A01544

Yes. That's a curious serial number with 0A as the two-digit year designation. The tech questioned it a long time ago. But that's what is on...

Thanks for the ideas. I'll have the tech over again soon and suggest these items for checking. All the rubber drain hoses do look OK, and they have been removed/blown out/primed twice in the last...

Thanks for the ideas.

Venting is on the left side (high end connection of the inducer). The white plastic shim is in place in the cabinet hole to support the vent pipe (tech told me it was to...

As a homeowner, I agree that it is very important to insist on at least a 10yr parts and labor warranty.

At the time I was buying my 58MVP three years ago, with eight bids no contractor offered a...

Well, I tried attaching a half-dollar size metal disk (knockout from a handy box) to the diffuser perforated disk, and it still faults with 31.

Any other suggestions to debug or fix the issue that...

Sorry didn't completely reply to the ideas about further restricting the airflow via cementing a metal disk in the input. That's an excellent idea. The Carrier Distributor mentioned this as a...

Thanks. No pulsing observed with the disk in place. That is one of the issues that is supposed to occur if the perforated disk is not in place although no pulsing was seen even w/o the disk.

Thanks yes I have downloaded all the relevant documentation a couple of years ago including the installation guide which contained the specs for the PVC pipe and perforated disk. 2" is definitely...

This is an ongoing problem for a few years involving multiple service calls on this Carrier 58MVP080 series 140 furnace which was installed new in my house by a local HVAC contractor.

The symptom...