Search: Posts Made By: Nchristopher
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11-27-16, 10:59 AM
Replies: 40
Views: 17,159
Posted By Nchristopher

So possibly three problems: 1. The filter...

So possibly three problems:

1. The filter is too restrictive
2. The return ducts have some internal obstruction
3. The return ducts are too small

I tried a fiberglass filter and with that...
11-26-16, 04:43 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

Also, if I take the filter out of the circuit and...

Also, if I take the filter out of the circuit and run the heat the limit switch does not trip. This is with the evaptorator cover and blower cover in place.

The filter I bought was a MERV 4...
11-26-16, 03:34 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

So I did another experiment to test if it was an...

So I did another experiment to test if it was an obstruction in the ducts.

I took the access panel for the evaporator off and ran the heat. This way, if there was an obstruction in the duct...
11-23-16, 01:30 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

Thanks, I have had two HVAC repairmen come...

Thanks,

I have had two HVAC repairmen come by and one suggested to replace the blower motor and another suggested to replace the whole furnace. I mentioned to both of them about testing the...
11-23-16, 12:50 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

If anyone is wondering you can get to the inside...

If anyone is wondering you can get to the inside of the coils by just taking off the screws holding the triangular piece and pushing that piece forward and down toward the heat exchanger below the...
11-23-16, 09:21 AM
Replies: 40
Views: 17,159
Posted By Nchristopher

Ok. I got the coils cleaned.... and it hasn't...

Ok. I got the coils cleaned.... and it hasn't fixed the problem.

I have checked the upflow ductwork and there is no obstruction within 5 feet from the furnace. I checked the flue and the chimney...
11-22-16, 07:17 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

It's not on the circuit diagram. I will call the...

It's not on the circuit diagram. I will call the manufacturer. However, when I look up the part for replacements, it looks like the limit switch is a 140F or 150F limit.

I took another look at...
11-21-16, 07:04 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

Looking at my furnace specifications, the maximum...

Looking at my furnace specifications, the maximum outlet air temperature is 170F but my limit switch is a 150F switch. Is this the cause of the problem?
11-21-16, 03:21 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

Latest HVAC technician said he thinks its either...

Latest HVAC technician said he thinks its either the blower motor or the exhaust fan motor that's causing the problem.
11-21-16, 10:24 AM
Replies: 40
Views: 17,159
Posted By Nchristopher

Thanks for the input, but what is happening is...

Thanks for the input, but what is happening is the primary high limit switch (which has an auto reset) is being tripped. The rollout switched and the secondary limit switches (which are manual...
11-20-16, 09:50 AM
Replies: 40
Views: 17,159
Posted By Nchristopher

Here are photos of the furnace and wiring...

Here are photos of the furnace and wiring diagram.

I am getting a fiberoptic camera to go into the vents and look for obstruction. I checked the airflow from each vent and they seem to be...
11-18-16, 12:10 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

Thanks again... I agree that the problem is...

Thanks again... I agree that the problem is going to get worse as it gets colder. My wife thinks I am crazy obsessing over something that its not really even effecting the heat in the house. I...
11-18-16, 06:52 AM
Replies: 40
Views: 17,159
Posted By Nchristopher

The CFMS are listed at the last two pages of...

The CFMS are listed at the last two pages of this:
https://www.hamiltonhomeproducts.com/vb/Repository/InstallationManuals_PartsLists/80AFUE%20Furnaces%202/GM8s-UPFLW/GM8S-UP-Install.pdf

Is there...
11-17-16, 08:50 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

Alright, tested it on the highest blower fan...

Alright, tested it on the highest blower fan speed and burners still went out after about 5 minutes.

I also tested the fan capacitor and it seems fine.

I am out of ideas.
11-17-16, 05:07 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

I checked the AC coils and they look clean. ...

I checked the AC coils and they look clean.

And it seems you were right about the board. When the furnace shuts off completely I just have to reset the power to the board and it turns on again....
11-17-16, 01:20 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

Thanks for all the input. The furnace is not in...

Thanks for all the input. The furnace is not in a manufactured home.

So during a call for heat on a normal working furnace, the burners stay on the whole time?
11-17-16, 11:33 AM
Replies: 40
Views: 17,159
Posted By Nchristopher

Actually i have found this:...

Actually i have found this: https://www.hamiltonhomeproducts.com/vb/Repository/InstallationManuals_PartsLists/80AFUE%20Furnaces%202/GM8s-UPFLW/GM8S-UP-Parts.pdf

which suggests that there is an...
11-17-16, 10:49 AM
Replies: 40
Views: 17,159
Posted By Nchristopher

I just checked again and the model number is...

I just checked again and the model number is correct. That was on the label inside the burner housing area.

If the unit is installed incorrectly then maybe that is the issue?
11-14-16, 07:34 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

Thanks for the input. The furnace is set up...

Thanks for the input.

The furnace is set up so that the blower fan is at the bottom and the burners are in the middle and the AC coil is on top. I dont think its a counterflow. However, there...
11-14-16, 08:12 AM
Replies: 40
Views: 17,159
Posted By Nchristopher

The air filter is a home depot filter (16x25x1)...

The air filter is a home depot filter (16x25x1) grade 4. As high flowing as I could find. I am not sure how many BTU. I did not see it on any label and I can't find it by looking up the model...
11-13-16, 09:04 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

Correct model number gm8s115c20uh11b

Correct model number gm8s115c20uh11b
11-13-16, 08:59 PM
Replies: 40
Views: 17,159
Posted By Nchristopher

Troubleshooting high limit switch problems on furnace

Hello, I have been looking around the forums for a solution to this problem but so far no luck.

I have a luxaire gas furnace. Model g1fa060s21g. I recently installed an ecobee thermostat...
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