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Old 07-01-2020, 10:16 AM   #1
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2019 25' Flying Cloud
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Refrigerator Fan Running when Refrigerator Off

I searched and found a few old threads discussing this but nothing recent. We have a side vent refrigerator in our FC 25RBT. The vent fan in the upper side refrigerator compartment runs even after the refrigerator has been off for a day. We are in Houston in July so it is hot, of course. I assume that is why it is running. Is that correct? It is not a huge problem because we store our trailer with power, but is there a way to make the fan not run when the refrigerator is off?
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Old 07-28-2020, 12:26 PM   #2
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The thermistor mounted on the fins in the upper outside vent compartment is possibly shorted (stuck closed). Nothing to get overly worried about except to preserve battery charge but you said there is power to the trailer. Not great for fan MTBF numbers and when using the refer the temp inside will be more erratic.

To confirm, disconnect one of the wires on the 'silver button looking thing' (AKA: Klickson/Clickson Thermal switch) and if the fan stops that is your issue. If you have a DVM you can check the resistance, it's a switch so it's either 0 or infinity.

There is the possibility that it is operating correctly because it is an 'F40-15C' which means it 'closes, switches on' at 40C (~104F) and in Houston it's possible for it to be that hot.

I'm looking at your thread because of the same issue, with the same 25' (RBT) trailer. floorplan. I have been able to confirm mine is shorted, it's in my house and still is 'closed'. I just called Jackson Center and they told me to call Dometic because it's still a warranty issue. Nothing but fun!
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Old 07-28-2020, 12:29 PM   #3
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Are you sure the fan is connected to the refrigerator at all? Many are add-ons that have a separate switch.

When your rig is not in use, and the fridge is turned off, will the fan keep running then? If so, then it is likely that there is a separate switch.

Pat
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Old 07-28-2020, 12:47 PM   #4
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Quote:
Originally Posted by pmclemore View Post
Are you sure the fan is connected to the refrigerator at all? Many are add-ons that have a separate switch.

When your rig is not in use, and the fridge is turned off, will the fan keep running then? If so, then it is likely that there is a separate switch.

Pat
Thanks Pat, but we both have the same year, model, and floorplan. Unless Airstream redesigned the refer compartment in mid-production it's unlikely, however not impossible, they are different.

I am building a 3-fan plate to install in the exhaust (upper) vent and would like at least one of the fans to be connected to the thermistor, same CFM as the OEM fan. The other 2 will be manually switched.

I also live in Texas and I will not know just how much air movement will work under changing situations. This will be a work in progress experiment.
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Old 07-28-2020, 02:07 PM   #5
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Originally Posted by RivetED View Post
I'm looking at your thread because of the same issue, with the same 25' (RBT) trailer. floorplan. I have been able to confirm mine is shorted, it's in my house and still is 'closed'. I just called Jackson Center and they told me to call Dometic because it's still a warranty issue. Nothing but fun!
Sorry for your issue, but at least I know I am not alone. I have a service appointment next week so I don't think I will go testing prior to that (trailer is stored away from home). I'll post here if they tell me what the issue was. I store the trailer indoors where it is not 40C so I am pretty sure something is amiss - just didn't know how the fans are controlled. Thanks for the explanation.
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Old 07-28-2020, 02:53 PM   #6
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Refrig fan running when refrig turned off

We had a 2017 Int. Serenity 23D with the 2 side vents refrig cabinet. The small fan supplied with the refrig would only run when refrig was switched on. No power to the little dime size thermoswitch when refrig was off.

On our 2019 FC 25 RBT the factory supplied fan (which I replaced with a twin fan setup to move more air thru the back cabinet of the refrig) has power going to the little dime size thermoswitch all the time. So even if the refrig is turned to the off position if it is hot enough outside to warm up the refrig cabinet the fans will come on and move some air until temp drops below thermoswitch cut off temp.

I discovered this by accident. We keep our AS at our home plugged in all the time as we use it often. Noticed the fridge fans running one day so I checked out the wiring. Low and behold, constant power to the thermoswitch. Why is it wired this way? I don't know. If I were to store the AS someplace without power I would manually unplug the fan thermoswitch.
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Old 07-28-2020, 03:34 PM   #7
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Originally Posted by uraljohn View Post
We had a 2017 Int. Serenity 23D with the 2 side vents refrig cabinet. The small fan supplied with the refrig would only run when refrig was switched on. No power to the little dime size thermoswitch when refrig was off.

On our 2019 FC 25 RBT the factory supplied fan (which I replaced with a twin fan setup to move more air thru the back cabinet of the refrig) has power going to the little dime size thermoswitch all the time. So even if the refrig is turned to the off position if it is hot enough outside to warm up the refrig cabinet the fans will come on and move some air until temp drops below thermoswitch cut off temp.

I discovered this by accident. We keep our AS at our home plugged in all the time as we use it often. Noticed the fridge fans running one day so I checked out the wiring. Low and behold, constant power to the thermoswitch. Why is it wired this way? I don't know. If I were to store the AS someplace without power I would manually unplug the fan thermoswitch.
So it's not a bug, its a feature? We only got our trailer in March and I thought that the fan did not do this then, but I am not certain.
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Old 07-28-2020, 04:08 PM   #8
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Originally Posted by DCPAS View Post
Sorry for your issue, but at least I know I am not alone. I have a service appointment next week so I don't think I will go testing prior to that (trailer is stored away from home). I'll post here if they tell me what the issue was. I store the trailer indoors where it is not 40C so I am pretty sure something is amiss - just didn't know how the fans are controlled. Thanks for the explanation.
It took me over an hour to get through to Dometic. They told me they would need to have the issue verified by an authorized Dometic repair center and not send out 'warranty' parts to an owner directly. Good thing you are going to a service dept.

I got the Dometic part #3104133.016 and if I want to buy from them it was around $40.- + $25.- shipping, Amazon Prime was ~$42.-.

Since I'm redoing the whole system I bought a 12vdc 'Ink Bird' digital thermostat (Amazon) with a remote probe, <$15.-. I'll experiment using the 3 fans with the thermostat and manual switches and see what works best.

Nothing like another design modification to help me pass the time!!
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Old 07-29-2020, 07:00 AM   #9
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Originally Posted by RivetED View Post
It took me over an hour to get through to Dometic. They told me they would need to have the issue verified by an authorized Dometic repair center and not send out 'warranty' parts to an owner directly. Good thing you are going to a service dept.

I got the Dometic part #3104133.016 and if I want to buy from them it was around $40.- + $25.- shipping, Amazon Prime was ~$42.-.

Since I'm redoing the whole system I bought a 12vdc 'Ink Bird' digital thermostat (Amazon) with a remote probe, <$15.-. I'll experiment using the 3 fans with the thermostat and manual switches and see what works best.

Nothing like another design modification to help me pass the time!!
Excellent info. Thank you.
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