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Amana gas furnace GUC series made in 1996, US DOE furnace efficiency study Amana HVAC & Appliance Manuals, Parts Lists, Wiring Diagrams

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Amana HVAC Equipment Age, Manuals, Contact Information

Amana condensing gas furnace, Minneapolis MN (C) Daniel Friedman LC

Free Amana Appliance, Furnace, Heat Pump, Air Conditioner Installation & Service Manuals, Wiring Diagrams, Parts Lists

Here are two different Amana gas furnace installations showing different approaches to combustion air intake. Above: an Amana condensing gas furnace installed in Minneapolis MN USA.

Below is an Amana gas furnace, GUC090X50B used in the US DOE gas furnace energy efficiency study cited here. - Yee & Brand 2015 - Yee & Baker (2013)

Amana® is a trademarked brand currently registered to Maytag® Corporation. Sister brands for Amana® include GMC®, Goodman®, Maytag®, and Janitrol®.

Amana gas furnace GUC series made in 1996, US DOE furnace efficiency study Amana HVAC Equipment Age Decoder:

Amana HVAC Contact Information & Manuals

Amana Refrigerator Incorporated was founded in Amana, Iowa, USA in 1934. The company was purchased by Goodman Manufacturing in 1997, then its appliance division and trademark were sold to Maytag in 2001. See MAYTAG APPLIANCES.

Don't expect to find helpful manuals, technical specifications, downloads at the website listed above. There you can however find current Amana products and product brochures as well as company contact information.

Currently Amana HVAC products are manufactured by GOODMAN Global under license.

Watch out: see the US CPSC recall notice below as it involves 140,000 horizontal furnaces manufactured by Consolidated Industries - and reports of 50 fires. Note that there is no PSC has received more than 50 reports of fires associated with the 140,000 horizontal furnaces manufactured by Consolidated Industries Inc.

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Intermittent Flame on Amana Air Command Hi Efficiency 80 Gas Furnace - Model GCI115X35A P1155313F - Year 1988

Amana Air Command Hi Efficiency 80 Gas Furnace - Model GCI115X35A P1155313F - Year 1988

Furnace starts and goes thru all phases nicely to running perfect for 3-5 minutes, then the burner flames go out and it immediately
starts trying to fire again 3 to 8 times in very fast repetition making a clang-clang-clang sound as slight flames shoot
on-off-on-off-on-off...

then it calms down for 20 seconds during which the draft inducer motor shuts off and starts up again then
the igniter glows back up and it fires perfectly and runs great for 3-5 minutes...

this cycle repeats itself, usually just once, until the home reaches thermostat set temperature of which then the shut down cycle is perfect. I must note three of every four
times the furnace will perform its entire cycle perfect without the above problem.

Lastly, I've seen the "flashing red light" producing 4 flashes during the problem, but I don't know the code's meaning.

owners manual, parts diagram, and flashing code
meanings cannot be found on Amana's website nor anywhere on the net in my searches.

I replaced the flame sensor but that was not the problem. The filter is clean and properly installed, intake vents and registers
are clean, the pressure switch & draft inducer motor seem to be working good, quality new in home thermostat is only 6 months old.

I believe it's either the flue needs to be removed from the draft inducer motor & cleaned, or the fan limit switch mounted above
the burners is failing.

If anyone has experience or knowledge of this same problem, possibly familiar with this furnace model, I would appreciate the help
and any knowledge or questions, thank you. On 2021-01-1 by Billy -

by (mod) - check safety conditions first such as flue gas spillage

Billy

I would check safety conditions first such as flue gas spillage

4 Flashes on the error indicator light typically means High limit cut-off due to faulty wiring or bad filters.

so we check first for the easy fix: see if there's reduced airflow through the system - a dirty filter, dirty blower, etc.

by Billy

Thank you sir, yes I've been checking and monitoring ever since the problem arose, I've found no flue gas spillage or any gas abnormalities.

I should de-emphasize the "flashing flames" as I saw this only once upon the unit fighting itself back & forth to shut down or not - this is the "clang-clang-clang" which is actually more of a "chatter" like a "click-click-click...

it's very quick and appears to be the thermostat telling the furnace "no we haven't reached my temperature setting yet" but a safety in the furnace is saying "to hell with you I'm shutting the gas off" in other words they're fighting each other in this brief moment - then draft inducer motor shuts off for 15 seconds, starts back up igniter glows and all runs perfect to finish.

Is there instructions to the knowledge & tools needed to perform a complete cleaning of the flue, or can this only be achieved via a professionally trained tech? Still getting the 4 code flashes during the failing moments.

Reply by (mod) -

Billy

With the immediate life safety worry under control per your vigilance, what's next;

If the heater is being cycled off by the limit control we ought to see the temperature dial reaching the upper limit or close to it;

Some techs advise removing the limit control and cleaning the sensor - typically a bimetallic spring wound in a spiral.

I'd be nervous about relying on that approach; though I might try it as an experiment I'd instead replace the limit control switch and I'd inspect the plenum for sooting.

According to Amana's error code guide,

Four LED flashes indicates a Pressure issue. High limit cut-off due to faulty wiring or bad filters.

Recommended action: Replace or clean the air filter; clean drain tubes of moisture or debris;

May have an open limit switch that requires a jump, ensure not to run it with the main switch bypassed.

It was a disappointment to visit the Amana website where the company either has hidden or simply decided not to offer any Amana furnace troubleshooting help;

Goodman brand diagnostics may still work for Amana gas furnace owners.

by Billy - furnace would not run because the door was not shut - door safety interlock switch keeps system OFF

I should add that the end cycle has been shutting off about 45 seconds too soon in recent days, this is the same wether the old limit switch or new one installed, still good heat in the ducts.

Furnace now running, I didn’t have the front panel installed correctly so the safety switch of recognizing panel was installed securely wasn’t engaging. Furnace still has original problem but isn’t giving me any flash codes, furnace does run better now and is more quiet & smooth, the problem clickclickclick is much quieter & not so aggressiv

I’ve read this model does shutoff the gas about every 5m for a bit, a design feature making it more efficient, the fan inducer motor never stops when it performs this, however when the problem ‘clickclickclick’ shut off happens the fan inducer motor does shut off & recycle back on.

Thankfully I found the original flash codes inside the furnace housing, if only Amana had the identifying parts diagram I could have fixed this weeks ago, also would’ve been able to communicate with you better - of which I’m quite embarrassed + all my unnecessary elaborated posts, I’m very thankful for you & all you’ve shared.

my furnace is looking & performing much better in many ways because of you.

I haven’t pressed in that manual reset limit switch button (on the blower) yet, I’m afraid something might go wrong until understand it better, it seems this might have to do with running the fan continuously but I don’t know as it might fix the problem as it seems to maybe comply with the new limit switch I installed.

Well I’m off to find the where & what is the ‘Open’ High Limit Switch the 4 flashing code is crying for.

Lastly, calling Amana only results in them telling me to call one of their techs or buy a new Amana, they won’t give up anything about older models! I like my model, it’s clean & well kept, besides I named her Little Bertha years ago - so I’m attached to her like an old car <3 thank you ever again sir, mr Friedman On 2021-01-24

On 2021-01-25 by Billy

*The end/last cycle of the blower running to expel the last heated air out of the ducts/registers is running 45s less than it used too, it was always perfect and not shutting off until air out of the registers became luke warm. In other words there’s still strong heat left in the system bc the end cycle is shutting off too soon.

Mounted to the blower housing and wired to the control board is a small switch with only 1 button on it, a large decal stating “Manual Reset Limit Switch” with an arrow pointing directly at this 1 button switch. It would help greatly if I could find out what this switch does if I push it in.

There are no other controls/dials etc., just the push button on this part. Attach the schematic in case it helps, hope it’s readable upon zooming.

Also - the flue is fine, no measurable soot in the plenum.

wiring diagram for Amana Air Command Hi Efficiency 80 Gas Furnace - Model GCI115X35A P1155313F - Year 1988 (C) InspectAPedia.com Billy

Above: wiring diagram for Amana Air Command Hi Efficiency 80 Gas Furnace - Model GCI115X35A P1155313F - Year 1988

On 2021-01-25 by (mod) - furnace Fan shuts off too soon

"Fan shuts off too soon" ? can you explain a bit more - too soon relative to what?

Good going on noticing that the door interlock switch can leave your heater shut down. It's a common mistake and one I've mentioned from time to time _ I should have thought to include that in our discussion earlier.

by Billy - Problem found, a bad Amana gas furnace limit controls switch

Amana Air Command Hi Efficiency 80 Gas Furnace - Model GCI115X35A P1155313F - Year 1988 (C) InspectApedia.com Bill

It was the Limit Switch in the heat exchanger, it was opening at 180F degrees which was the hottest the air ever achieved in the exchanger, this Limit Switch isn’t supposed to open until 230F

It was the furnace’s original switch made in 1988.

I’ve ordered an OEM replacement but it’s rating is 220F, I think it’ll be fine, pic attached is the original.

Thank you :) On 2021-01-29


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