Reply
 
Thread Tools Display Modes
Old 08-27-2016, 02:13 PM   #1
Junior Member
 
Join Date: Aug 2016
Posts: 5
FU code on fan mode with Dometic Thermostat

What does the "FU" mean on the fan LCD display on my thermostat? I see a different brand thermostat from Dometic (which is what I have) that says FU can stand for full keypad lockout. Someone else said it stands for "fuse" How do you unlock the Dometic keypad? I don't even know how it got locked in the first place.
__________________

__________________
snsaclark is offline   Reply With Quote
Old 08-27-2016, 03:31 PM   #2
Head Rambler
 
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 3,481
What model of thermostat do you have?

I looked at both the Dometic single zone and two zone units and I don't see that code on either of them.
__________________

__________________
Salem 29RKSS Pushing a 2500 Mega-Cab CTD!
Gotta go campin!
Bama Rambler is offline   Reply With Quote
Old 08-27-2016, 04:24 PM   #3
Junior Member
 
Join Date: Aug 2016
Posts: 5
Yes...my manual tells me what "E" codes mean, but nothing about FU. If I click the "on/off" button it goes to "Fan" mode first where I get "FU". It used to say either AU for Auto or HI (high) LO (low). Then you could click heat and set a temperature or cool and set a temperature. Now Fan says "FU" and heat and cool shows an "E" code which is one of the error codes. I am hoping FU doesn't mean what I have commonly used it heard to imply, although that's what I thought of when my teeth were chattering because I was so cold!!!
__________________
snsaclark is offline   Reply With Quote
Old 08-27-2016, 04:47 PM   #4
Senior Member
 
Join Date: Jun 2015
Location: payson, az
Posts: 307
could FU be AU with one segment burned out?
__________________
2015 cardinal model 3825fl
2015 dodge ram 3500 dually
CHICKDOE is offline   Reply With Quote
Old 08-27-2016, 06:05 PM   #5
Head Rambler
 
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 3,481
Which 'E' error are you seeing in Heat and Cool?
__________________
Salem 29RKSS Pushing a 2500 Mega-Cab CTD!
Gotta go campin!
Bama Rambler is offline   Reply With Quote
Old 08-27-2016, 07:17 PM   #6
Junior Member
 
Join Date: Aug 2016
Posts: 5
I don't think it is AU with a segment burned out. I bought the trailer new and have only been in it 5 days. One the FU appeared the E codes appear in heat or cool mode and you can't see the temperature. One had E5 and one had E9.
__________________
snsaclark is offline   Reply With Quote
Old 08-27-2016, 08:09 PM   #7
Head Rambler
 
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 3,481
I'm sure you know this, but here are the error codes that you're seeing.

Quote:
E5 - Open circuit or out of range Freeze Sensor. Air conditioner and dehumidification operation will be locked out. Heat pump, furnace, heat strip and fan operation can continue to operate but displays the last temperature set-point.
Quote:
E9 - Invalid zone configuration. The dehumidifier DIP switch and either the heat pump or heat strip DIP switches are set to the ON position in one zone. Heat pump, heat strip, air conditioner, and dehumidify operation will be locked out in the affected zone.
From the description you gave, I'd say that your thermostat is failing. The FU is probably just a symptom of the failure.

Since it's a new unit, it's under warranty. I'd contact your dealer and let them look at it.
__________________

__________________
Salem 29RKSS Pushing a 2500 Mega-Cab CTD!
Gotta go campin!
Bama Rambler is offline   Reply With Quote
Reply

Tags
dometic, fan, thermostat, modifications

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




» Virginia Campgrounds

Reviews provided by




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 09:29 PM.