Reply
 
Thread Tools Display Modes
Old 07-26-2012, 11:43 PM   #11
Senior Member
 
jimh's Avatar
 
Join Date: Jul 2010
Location: Lake Charles, La.
Posts: 1,531
if u could open the covers and look at the relay and see if there is anything that might be touching or loose. i would also leave the covers off and watch the relays and see if the fan is relay is opening when the fan stops. (if u kill the 120 to the air conditioner, u can turn the thermostat on and hear the relays and located them (assuming they aren't readily visible).
there should be a wire (from thermostat) going to the fan relay and one going to the compressor relay (so u can run the fan w/o the compressor).
i've seen capacitors go out but they usually show some sort of distortion. i would question the cap going out due to low voltage. these items are usually voltage dependent to charge them. i wouldn't try to argue the point but it does raise a question.
i'm really stumped as to why the compressor would continue to run unless the fan motor is going out or the thermostat not calling for it to come on. a fan motor that isn't coming up to speed or becoming intermittent will cause very cold air to come out and a freeze up if compressor isn't shut down. (if it is severe enough, the compressor will shut down due to high head pressure either from a high pressure switch, if it has one, or the thermal overload inside the compressor).

if u have changed that thermostat in the past, double check ur wiring and make sure that something isn't touching where it shouldn't. make sure u have the wires connected to the correct terminal.

the freezing up really makes me question the fan speed. especially if the unit cools fine.
I believe RV wizard has the control perty well nailed. you may not find as many capacitors but that varies with manufacture and how they felt that day.

i would tell u just to change ur fan motor and see if it solves the problem but u may want to do a little more trouble shooting before throwing parts at it. make sure the relay itself isn't bad.
the fan on mine would run for a couple hrs then it would stop. the difference is that it would make a noise (i've had fan motors stop, but this is the first one ive seen that made a loud noise). the hour or two became 15 minutes then not come on at all. next day, it may work for an hour again. (bearings were good and not dry).
__________________

__________________
jimh is offline   Reply With Quote
Old 07-27-2012, 01:15 AM   #12
Junior Member
 
Join Date: Jul 2012
Posts: 14
I forgot to also say that there is a capacitor for the fan motor as well and the motor wont run unless the capacitor is present, if the motor is intermittently functioning in short cycles either the capacitor is going bad or the wingdings in the motor are shorting out due to overheating, if there is a smell of burning plastic or or discoloring in the winding to a dark brown the coil most likely has a short and is arcing inside.
__________________

__________________
RV Wizerd is offline   Reply With Quote
Old 07-27-2012, 02:12 AM   #13
Junior Member
 
Join Date: Jul 2012
Posts: 14
and well there's a third culprit lurking in the system and that is the themoststat slider, the Coleman Mach thermostat has a analog slider control that will start to malfunction because of dust contamination, let me put it another way remember the old battery operated transistor radios, how when you turn them on they would crackle up a storm well that's from dust or contact oxidizing and the only way you could get rid of it was to move the volume control up and down quickly to remove some of the contamination well the thermostat will do the exact same thing, by turning off the power to the upper unit then put the thermostat on cool and listen for a rapid clicking sound as you move the slider from say 80 degrees to sixty slowly if a rapid clicking sound is heard the problem is the contact strip in the thermostat is contaminated, I should also mention as well that cigarette smoke will foul it up too, if this is the case you can do one of two things
first is to replace the thermostat and go digital and install model #8530A345 which has open end wires. or you might try some contact cleaner which can be purchased at the Source in a spray can form, but CAUTION if you use this method as the saying goes { a little goes along way} if you dowse the slider you may end up washing away the silicon lubrication and that will render the thermostat useless and it will have to be replaced.
__________________
RV Wizerd is offline   Reply With Quote
Old 07-27-2012, 09:27 AM   #14
Junior Member
 
Join Date: Jan 2012
Posts: 29
Thanks everyone for all the responses. My first thought is it could be a relay sticking, but the unit seems to cycle OK. When the fan comes on, the compressor waits about 2 or 3 minutes now. When the fan kicks off due to temp change in the camper, the compressor stays on for 2 or 3 minutes after. Also I noticed this, with the thermostat off the compressor stays on for a few minutes. I have to turn off the breaker for it to stay off. When I returned home after this last trip, I plugged the camper in I turned the breaker on and the compressor came on. So it is sitting at this time with the breaker off.
__________________
daavalanche is offline   Reply With Quote
Old 07-27-2012, 11:04 AM   #15
Junior Member
 
Join Date: Jul 2012
Posts: 14
Smile Cool ideal Fix

Larry Cavens here
Sounds like you hit the jack pot!!!
So the only thing there is left to do is replace the control box which is in most cases up in the ceiling plenum
if the unit is still under warranty there shouldn't be any cost to you but if it isn't you're looking any where from 150.00 to 300.00 dollars depending on if you have just cooling/ or cooling with a electric heat strip combo
They're not that hard to re & re if you are mechanically handy, it will be either three quick dis connectable plugs or two dis connectable plugs and four dc wires that come from the thermostat/ or if you have the electric heat strip feature there will be five dc wires, I always if I can take pictures before hand so I have a point of reference to fall back on.
__________________
RV Wizerd is offline   Reply With Quote
Old 09-09-2012, 10:30 AM   #16
Junior Member
 
Join Date: Jan 2012
Posts: 29
Update,

I finally was able to get my RV in for service. They replaced the thermostat and AC control board. They said it was probably the thermostat but they replaced both just in case. Thanks for all the replies.
__________________
daavalanche is offline   Reply With Quote
Old 09-09-2012, 02:46 PM   #17
Senior Member
 
jimh's Avatar
 
Join Date: Jul 2010
Location: Lake Charles, La.
Posts: 1,531
sounds like they were covering all bases. glad u got it fixed.
__________________

__________________
jimh is offline   Reply With Quote
Reply

Tags
28bh

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.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 11:51 PM.