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Old 11-26-2018, 07:50 PM   #1
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Furnace and AC fan

We have a 2106 Vibe ultralite. We haven't used the Furnace much so I didn't encounter this question before. When we turn the furnace on, the AC main fan comes on to low or hi depending on how the thermostat is set. The heat comes on and works fine. Recently, the RV park where we were staying had a power disruption for several hours and the Main AC fan shut down but the furnace heat and furnace fan worked fine (under battery power). My question is if this was normal operation with the AC fan coming on? Or do we have a defective thermostat or wiring. The AC fan is very noisy it makes conversation and TV watching difficult.
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Old 11-26-2018, 07:54 PM   #2
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We have a 2106 Vibe ultralite. We haven't used the Furnace much so I didn't encounter this question before. When we turn the furnace on, the AC main fan comes on to low or hi depending on how the thermostat is set. The heat comes on and works fine. Recently, the RV park where we were staying had a power disruption for several hours and the Main AC fan shut down but the furnace heat and furnace fan worked fine (under battery power). My question is if this was normal operation with the AC fan coming on? Or do we have a defective thermostat or wiring. The AC fan is very noisy it makes conversation and TV watching difficult.
This gets reported about 5-8 times per month. Some call this operation a feature.
To stop it, cycle your thermostat from Cool through Heat to Fan. Then use the + or - keys to cycle fan speed from HI through LO to AU for (Auto).
You're fixed.
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Old 11-26-2018, 09:45 PM   #3
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Mr. Dan speaks truth!
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Old 11-26-2018, 10:07 PM   #4
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This gets reported about 5-8 times per month. Some call this operation a feature.
To stop it, cycle your thermostat from Cool through Heat to Fan. Then use the + or - keys to cycle fan speed from HI through LO to AU for (Auto).
You're fixed.
I'd be one of those 'some'.

People come on here pretty much weekly saying they have a problem with their furnace or their air conditioning because the A/C fans runs when they turn the furnace on, when in fact, they do not have a problem.

The system was engineered and manufactured to operate in this manner to help distribute the warm air (warm air rises) throughout the R/V.

The end user has the option to either use it in this mode or turn it off. It is all explained in the manual for the thermostat.

If an item has more than one mode of operation... and that option is working as designed... I'd call that a feature.

I hope the OP gets the thermostat into whatever mode best suits them.
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Old 11-26-2018, 10:12 PM   #5
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I'd be one of those 'some'.

People come on here pretty much weekly saying they have a problem with their furnace or their air conditioning because the A/C fans runs when they turn the furnace on, when in fact, they do not have a problem.

The system was engineered and manufactured to operate in this manner to help distribute the warm air (warm air rises) throughout the R/V.

The end user has the option to either use it in this mode or turn it off. It is all explained in the manual for the thermostat.

If an item has more than one mode of operation... and that option is working as designed... I'd call that a feature.

I hope the OP gets the thermostat into whatever mode best suits them.
Which of my words drew that? Was it "fixed"? The OP wanted his AC fan stopped. I told him how. I didn't say it was a thermostat failure or error.
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Old 11-26-2018, 10:46 PM   #6
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Which of my words drew that? Was it "fixed"? The OP wanted his AC fan stopped. I told him how. I didn't say it was a thermostat failure or error.
No worries Mr. Dan.

Actually the OP asked if the A/C fan running during furnace operation was normal or whether something was defective.

I answered their question.

99% of the time when this question is asked we tell folks how to 'stop it' but we never explain in full how it operates.
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Old 11-26-2018, 11:05 PM   #7
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No worries Mr. Dan.

Actually the OP asked if the A/C fan running during furnace operation was normal or whether something was defective.

I answered their question.

99% of the time when this question is asked we tell folks how to 'stop it' but we never explain in full how it operates.
My switch was flipped by this comment from the OP: "The AC fan is very noisy it makes conversation and TV watching difficult."
I was trying to help him solve that issue.
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Old 11-27-2018, 06:10 PM   #8
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Thanks Mr. Dan. At first the auto (AU) didn't show up. But after a couple try's of cycling through, it did show up and the furnace then worked without the AC fan. I think the furnace fan will be sufficient to circulate the air but I need to try this.
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Old 11-28-2018, 10:28 AM   #9
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Thanks for the info
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Old 11-28-2018, 10:40 AM   #10
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My switch was flipped by this comment from the OP: "The AC fan is very noisy it makes conversation and TV watching difficult."
I was trying to help him solve that issue.
X2 I read it the same way.
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Old 11-29-2018, 11:54 AM   #11
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For some reason, the AU (AUTO) didn't show up for several times when I cycles thru the + and_ fan settings but eventually showed( at first it just went Hi, LO, HI, Lo then I cycled through the cool and furnace then back to fan several times). I'm an Electronics engineer and wonder if this is written into the firmware of the thermostat or maybe something else. Problem appears solved and thanks for the help.
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Old 11-29-2018, 03:37 PM   #12
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My switch was flipped by this comment from the OP: "The AC fan is very noisy it makes conversation and TV watching difficult."
I was trying to help him solve that issue.
X2
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