Question about Dometic RM2452 Refrigerator

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RM 2453 Frig. trips the GFI Circuit and does not power up on AC mode.

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Shorted heater element replace

Posted on May 27, 2016


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Posted on Jan 02, 2017

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SOURCE: I have a 2004 Coleman

Hello Barry,

More than likely, your heating element has become shorted to its case, thereby allowing current to flow outside of the neutral, tripping the GFI. If you have a multimeter, you can measure the resistance of the heater itself (AC heater should be 125 ohms, +/-10%). There should not be any continuity between each of the heater wires to the case of the heater itself.
Service Manual
Owners Manual

Posted on Aug 18, 2010

  • 1157 Answers

SOURCE: Have a Dometic 2452/2453 fridge. when in gas mode

Hi jjk894,

If it does not cool on either gas or electricity but is getting hot at the rear of the unit chances are that the cooling unit will need factory repair or replacing. There are only two main failures with gas RV refrigerators.

1 The RV refrigerator is run unleveled causing the cooling unit boiler to overhead, block and crack.

2 The RV refrigerator cooling unit's steel tubing rusts and the ammonia/hydrogen gas leaks out.

Gas RV refrigerators do not operate the same way as other refrigerator types. They are charged with four types of chemicals and this mixture must be exact for the unit to work properly. The four chemicals of the charge are.

1. Water
2. Ammonia Gas
3. Hydrogen Gas
4. Rust Inhibitor powder

Boiler blocks or cracks - If the refrigerator is run while not leveled for an extended period, the cooling unit water will not flow into the boiler. The boiler as a result gets excessively hot and can bake the rust inhibitor. This will in-turn block the small 1/4" tube in the boiler and all flow will stop. If the refrigerator is kept running under these circumstances the boiler tube will get so hot that it will crack open. If this happens a yellow powder around the burner area may be visible indicating that the cooling units rust inhibitor is leaking.

Leaks - When a unit rusts and leaks as a result, the ammonia gas is lost first. You can sometimes smell the ammonia gas. However when the door is opened or if the leak is small there can be little or no smell. Under these circumstances there could be a boiling sound at the back of the refrigerator. This means the hydrogen gas has also leaked out and the water is now boiling. Ammonia smells or large gurgling sounds from the refrigerator are indicators that the refrigerator cooling unit is leaking.

Hope it helps.

Thank you for using FixYa.

Posted on Aug 23, 2011

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Service Manual
Owners Manual

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