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Dometic 2551 RV Fridge; only works on LP. tested AC heating…

Dometic 2551 RV Fridge...

Dometic 2551 RV Fridge; only works on LP. tested AC heating element 120V 175 W, 80 ohm, tested at 88 ohm' got 120V coming into unit, no 120 going out to AC heating element(made sure unit was on Auto and not Gas); voltage at DC junction box tested at 12 volts; lights on control panel all work, LP works great; confused because service manual says DC junction box should test at 6V; does that mean 12V coming from the RV power distribution panel or 12V going into the fridge power board and Fridge power board converting it to 6V; my thoughts are that the Fridge Power board is gone or do I need 6 volts supplying the fridge power board?

Mechanic's Assistant: Is the power loss consistent, or does it fluctuate?

Not sure what you mean; no 120V AC coming from RV Fridge Power Board at all, zero, negative

Mechanic's Assistant: What year is your Element?

Not sure probably original, tests indicate good, 120V 175W should be 80 OHMs I get 88 OHMs

Mechanic's Assistant: Are you fixing your Element yourself? What have you tried so far?

Why would I, the element tests good?

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Answered in 11 minutes by:
4/2/2017
RV Mechanic: Robert, RV Mechanic replied 5 years ago
Robert
Robert, RV Mechanic
Category: RV
Satisfied Customers: 24,089
Experience: 23 yrs. RV experience including Cummins North West, Country Coach, Monaco Coach - vendor certified.
Verified

Hi my name is Robert.....

IF you checked the outlet and it has 120 volts and the fuse on the board is good and the element is around 80 ohms I would say the circuit board is at fault. What I might do is check the polarity at the outlet OR try plugging the fridge into another outside source and see what happens. That heating element should be heating up when you are on AC power. The fridge also runs on 12 volts. IF you have no 120 AC coming from the power board and the fuse is good I would replace the lower circuit board, I do not feel 8 ohms is the problem as there is a 10% plus or minus on that reading. Please let me know if you have more questions or concerns.

IF you are satisfied with my efforts please feel free to select a star rating on the page....

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Customer reply replied 5 years ago
Appreciate the reply, you state and I agree that the fridge runs on 12 volts; so what is the reference in the service manual of 6 volts at the DC Junction Box, see page 10 of the Service manual I attached; I will plug the AC into a different AC source as suggested and let you know what happens
RV Mechanic: Robert, RV Mechanic replied 5 years ago

You did not read that correctly they are talking about AC ripple and the tolerance for that, DC voltage should be 12 volts, read the paragraph and you can see the meter is set to AC NOT DC....

The fridge needs 12 volts DC.... Robert

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Customer reply replied 5 years ago
A duh moment on my part; you are right, appreciate the clarification; as far as the circuit board replacement, stick with Dometic or are the Dinosaur replacement boards just as good; its a matter of cost comparisons
RV Mechanic: Robert, RV Mechanic replied 5 years ago

Dinosaur boards are just as good if not better and they have excellent customer service and tech support, I would go with them if at all possible...

IF you are satisfied with my efforts please feel free to select a STAR rating on the page, it is the only way I get "credit" for helping out, you can STILL follow up if needed...

Robert

Robert
Robert, RV Mechanic
Category: RV
Satisfied Customers: 24,089
Experience: 23 yrs. RV experience including Cummins North West, Country Coach, Monaco Coach - vendor certified.
Verified
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