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Author Topic: Dometec 3-way refrig  (Read 775 times)

Dometec 3-way refrig
« on: February 26, 2018, 09:03:55 PM »
I'm new to this forum, but I have no idea where to turn at this point.
I have Dometic 3-way refrigerator in my Alaskan camper that petered out on me.  I
I changed the battery which has a trickle charger plugged into it, so the battery is charged
I changed the upper and the lower circuit boards to no avail.
When I turn it on it goes to the DC power and nothing else, the gas nor the AC power comes on.
The DC power is not making the freezer cold after two days in that position and  I'm out of options.

Can anyone help me with this?

Bill

Isaac-1

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Re: Dometec 3-way refrig
« Reply #1 on: February 26, 2018, 09:34:19 PM »
If you have not found it yet, take a look at this page http://dave78chieftain.com/Technical.html there is a lot of good rv refrigerator information there
2002 Safari Trek 2830

Gary RV_Wizard

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Re: Dometec 3-way refrig
« Reply #2 on: February 27, 2018, 09:58:02 AM »
What model Dometic?  There are several 3-ways models.

Most such fridges auto-select 120vac power if available and LP gas if not. 12vdc is a last resort cause it sucks a lot of amps to get any cooling at all. Have you verified that 120vac is actually reaching the fridge? And that  the AC power fuse on the fridge circuit board is not blown? What does the LP burner do if yu force it to LP gas mode? Any attempt to light? Is the gas line on and LP gas reaching the burner?
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

Re: Dometec 3-way refrig
« Reply #3 on: February 27, 2018, 11:52:49 PM »
Model number RM2354
This fridge goes to DC only in auto-select, it does not light up the AC light except when first turned on, all lights go on for a short while.

Not sure if the 120vac is actually reaching the fridge.  No fuses are blown, that was the reason I ended up buying and replacing both circuit boards one at a time.

Forcing it to LP gas mode lights up but no igniter sounds comes on, the gas is on at the tank, and I bled the line of air by lighting the stove. 
Not sure if the LP gas is reaching the burner.  The only thing left, that I can think of is the cable between the upper and lower circuit boards. 

Thanks Gary 

Gary RV_Wizard

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Re: Dometec 3-way refrig
« Reply #4 on: February 28, 2018, 07:27:49 AM »
Download the RM 2354 Diagnostic Manual at http://www.fourwh.com/NewDometicRefrigeratorManual.pdf

I think you first need to assure that 120v and LP are present and then figure out why they are not being recognized. Since DC mode is working, the odds are good that the circuit boards and cable are fine. Before throwing more parts $$ at it, check for proper AC voltage at the outlet the fridge is plugged to. If present there, use a voltmeter to check for 120v power at the circuit board (there is a fuse on it for the 120v electric heat element). If the AC fuse is blown, it will not detect or use 120v power.  There is also a non-replaceable thermofuse built into the cooling unit to prevent dangerous overheating. It should be checked for continuity. On some versions of the 2354, the thermofuse has a reset switch.
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

Sun2Retire

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Re: Dometec 3-way refrig
« Reply #5 on: February 28, 2018, 08:17:11 AM »
If I read the original post correctly the fridge is not getting cold on DC either, so DC mode is not working
Scott
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Gary RV_Wizard

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Re: Dometec 3-way refrig
« Reply #6 on: February 28, 2018, 08:51:44 AM »
He said 12v mode activates but the freezer isn't chilling.  Not clear if that means "not working at all" or just "not very cold".    The DC mode won't do much cooling at the best of times and typically does not handle a warm fridge very well.
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

Re: Dometec 3-way refrig
« Reply #7 on: February 28, 2018, 08:52:23 PM »
Yea, DC does not work either, although, that is where the light stays on when in auto-mode. It's dead, nothing cools.

I will check the 120v but the LP is not present, although, the gas is on at the tank and no igniter sound is heard when in gas-mode.  The light just stays on at GAS. It's dead nothing happens.

Now this is new to me,
"There is also a non-replaceable thermofuse built into the cooling unit to prevent dangerous overheating. It should be checked for continuity. On some versions of the 2354, the thermofuse has a reset switch." Now where to fine the reset switch for the thermofuse?  I will need to buy me a continuity tester and figure out how to use it  before I  can tell you what's happening here but I feel good we are heading in the right direction.

It's nice to have guys like you to give me some idea on what to do.  I thought for sure I'd have it fixed with two new circuit boards. I will let you know my results when completed. 

Thanks so much,

Bill

Gary RV_Wizard

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Re: Dometec 3-way refrig
« Reply #8 on: March 01, 2018, 11:24:14 AM »
The service manual I linked for you will show where the thermofuse is, and its reset if there is one. That's where I got the information about it.

OK, so there is no cooling at all in 12v mode? And if you force it into LP Gas mode, it shows GAS on the display but no attempt to ignite the flame?  In 12vdc mode, can you feel any warmth at the cooling unit boiler?  It should be getting quite hot there, and warm throughout the rest of the tubing.

120vac electric and 12v DC electric are the two simplest modes of operation, so I would do diagnosis based on one of those. The circuit board doesn't have to do much in either case except monitor the thermostat (the thermocoule on the fins inside) and switch the power relay On/Off as needed. If you can get one of those working, you are on the path to complete success.

Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL