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Old 02-18-2016, 07:00 AM   #11
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Just an update on our on-going effort to isolate the cause of our furnace short cycling problem.

Talked with a tech from Atwood the other day and he believes the furnace is the cause of what we are experiencing (not the thermostat).

We will be taking the trailer to our dealer mid-march for them to further investigate the issue and hopefully get it resolved.

After talking with Atwood and our dealership, I have confidence we'll get to the bottom of what's causing this issue and will have it resolved before this camping season starts.

I'll post once this issue is resolved with what turns out to be the cause and what the fix was.
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Old 02-18-2016, 07:40 AM   #12
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Thanks for keeping us up to date on a resolution.
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Old 02-18-2016, 07:49 AM   #13
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Thanks for keeping us up to date on a resolution.
You're welcome.

Our back-up plan is if the dealership can't fix the problem is to see if we can't schedule an appointment with Jayco's service department.

We're hoping to do a trip this summer to tour the factory anyway.

Hopefully it doesn't come to that. Would rather relax touring the area and the Jayco factory when there then have the trailer in for warranty work.
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Old 02-18-2016, 08:21 AM   #14
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Originally Posted by ROC-REQS View Post
You're welcome.

Our back-up plan is if the dealership can't fix the problem is to see if we can't schedule an appointment with Jayco's service department.

We're hoping to do a trip this summer to tour the factory anyway.

Hopefully it doesn't come to that. Would rather relax touring the area and the Jayco factory when there then have the trailer in for warranty work.
The issue you have can be diagnosed by any qualified HVAC technician. RV, residential or commercial, they all have the same operating principals.

I'm lucky as I have one in the family.
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Old 02-20-2016, 09:03 PM   #15
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Maybe someone here can give me some ideas of what may be happening and/or suggestions on how to troubleshoot the problem.

The problem I'm experiencing is a very short furnace burn cycle (in the order of 15 - 30 seconds) after the inside temperature reaches the thermostat setting.

We have a 2015 361REQS Eagle Premier 5vr with an Atwood Excalibur 8900 III Series 40,000 BTU Hydro Flame Gas Furnace (Model # 8940) and a Coleman/Mach Single Stage Heat/Cool Digital Wall Thermostat.
We were plugged into 50A shore power with full LP tanks.

The furnace brought the inside temp to setting (71 degrees) with no problem.
Here's what happened after the inside temp became stable at 71 Deg.

1. Thermostat dropped to 70 Deg.
2. Furnace blower came on for the normal duration prior to furnace igniting.
3. Furnace ignited.
4. Thermostat increased to 72 Deg. within seconds (~15 - 30 seconds)
5. Furnace flame / burner shut off.
6. Furnace blower continued for normal duration.

It then took a few minutes (e.g., 10 - 15min) for the thermostat to drop to 70 Deg. and the cycle repeated.

Outside temps were in the 40s.

I've already had the thermostat replaced once.
I've also put insulation inside the wall around where the thermostat is mounted to the wall.

Any ideas or thoughts on what may be happening here and/or the cause for the furnace's short burn cycle?

Thanks in advance for any suggestions and/or ideas.
Next time when it happens try hot wiring thermostat . The furnace should come on if the thermostat is at fault. If the furnace does not come on check the limit switch. You can also hot wire the limit switch. Most likely it is the limit switch.
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Old 03-18-2016, 01:07 PM   #16
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Thought I would post an update on what's been going on with my furnace issue.

The trailer's been at the dealership for the past week while they've been running tests on the Furnace & T-Stat, under Atwood's guidance in an attempt to isolate the cause.

All tests run on both the T-Stat and Furnace showed both were operating properly and spot on.

Then, on Atwood's suggestion, the dealership ran the furnace for 6 hours with the T-Stat set to 74 Deg. and then after 6 hours took temperature readings at various locations around the trailer (i.e., using a heat sensor gun).

Background note: Our floor plan is such that the kitchen counter top shelf attaches to the wall very close to where the T-Stat is located on the wall. See picture below

The counter top temp near the T-Stat measured at 54 Deg.
And the wall between the counter top & T-Stat measured 61 Deg.

So, the thought is that the problem is being caused by the location of the T-Stat in relationship to the kitchen counter top.

The dealership currently has a call into Jayco to see what Jayco's response / recommendation / suggestion is to their finds.

I'll post an update when I hear what Jayco's response is and what the final resolution is.

It would be interesting to hear if any other owners of a similar floor plan (e.g., 361REQS EP/NP, 36REQS Pinnacle) are experiencing anything similar.
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Old 03-18-2016, 01:57 PM   #17
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If you assume the stat is good and the furnace is good then it's caused by location. Which could be a draft from either inside the wall or a draft of heat blowing on the stat from a register.
1. Where is the heat vent in the bathroom in relation to the stat?.
2. I can't tell what they are but could the 2 devices on the wall above the stat be generating heat? I can't tell what they are from the pic except that one is the tank gauge panel. are either of them warm?
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Old 03-18-2016, 02:22 PM   #18
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Originally Posted by dalebra View Post
If you assume the stat is good and the furnace is good then it's caused by location. Which could be a draft from either inside the wall or a draft of heat blowing on the stat from a register.
1. Where is the heat vent in the bathroom in relation to the stat?.
2. I can't tell what they are but could the 2 devices on the wall above the stat be generating heat? I can't tell what they are from the pic except that one is the tank gauge panel. are either of them warm?
Hi Delebra:

Thanks for the reply.

The Heat Vent in the Kitchen is location in front of the kitchen cabinet (see pic) so the cabinet is blocking the air flow to the T-Stat.

1. The Bathroom heat vent is away from the wall between the toilet and shower, its location is not in line with where the T-Stat is mounted - probably in-line with ~center of the kitchen wall looking at the picture (e.g., to the left of the wall outlet). But that's something I hadn't thought about.

2. The 2 devices on the wall is a switch (for ceiling fan) and control for fantastic fan roof vent and its a wall outlet to the left. Non-heat generating devices.

I've put insulation in the wall behind the T-Stat and have moved the T-Stat as far away from the counter top as possible.

Not sure what material Jayco used for the counter tops, but I was surprised its temp wasn't more the 54 Deg. after 6 hrs of running the furnace.
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Old 03-18-2016, 02:53 PM   #19
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I was surprised its temp wasn't more the 54 Deg. after 6 hrs of running the furnace.
Yes indeed, I am surprised that the countertop was only 54 Deg. also.
You would think it would take longer than 15-30 seconds to make a 2 degree rise too.
It will be interesting what the results are. And I am surprised that Atwood was not more help.

Keep us posted.
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Old 03-18-2016, 03:17 PM   #20
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... You would think it would take longer than 15-30 seconds to make a 2 degree rise too. ...
I did some self testing at home before taking the trailer into the dealership.
Had the T-Stat set for 70, let the furnace run for ~1.5 hrs, then started timing burn cycle times. All were ~1min in duration. Had a house thermometer sitting on the counter next to the T-Stat. When the T-Stat adjusted 2 Deg. the house thermometer adjusted ~0.2 deg. That's why I originally thought it was a T-Stat issue.

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... It will be interesting what the results are. ...
I'm also very curious and anxious to hear what Jayco has to say. This issue has been on record with them since Sept. of 2014. Jayco sent me a new T-Stat then, because at that time they also thought it was a T-Stat issue.

Quote:
Originally Posted by dalebra View Post
... And I am surprised that Atwood was not more help. ...
IMO I think Atwood was very helpful in providing assistance and suggestions to the dealership to help isolate the cause.
When they confirmed the T-Stat and Furnace was working properly, I don't think it's realistic for Atwood to help in location adjustment, because they don't know the details of the floor plan. IMO that's really a Jayco issue/resolution.

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Keep us posted.
Will do
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