Dometic 8501 Fridge problem

HI . I am a new owner of a 2011 177. Everything works great, except I can't get the Dometic 8501 refrigerator to operate in the "gas mode". The refrigerator works fine on 110volts and 12volts. The trailer is level, gas cylinders full, batteries fully charged, When I switch to "gas mode" absolutely nothing happens, The solenoid gas valve does not turn on, and there is no spark at the igniter. I at first suspected what appears to be a gray plastic control box outside by the gas valve to be the problem. To test, I turned the refrigerator off and held the power button in for several seconds, I then set the control to the "gas mode" and immediately ran outside and checked with a 12volt test light all wires coming in and going out of the gray box while the fridge should have been going thru its start up routine. Again, it showed no electricity either coming in or going out of the gray box. Thus I wonder if the problem is elsewhere. I have not pulled the fridge out of its compartment. Does anyone know if there are any fuses in this system, other than the ones in the main fuse panel for the entire trailer ? If so , where are they located ? Has any one else experienced this same problem ? Any assistance would be greatly appreciate. Thanks, Macdad

Does the fridge have one of the little igniter boards like the water heater has? That board seems to be a popular fix. Would be nice if that board worked for both, but i doubt that would be the case. Also, would it be ok to just hold a match at the venturi to lite it, and prove that it's just an ignition problem?

Hi. I wanted to thank all of you for responding. As recommended , I purged my gas line by running the stove for several minutes , but still no spark nor gas valve turning on. I also have read all the other related posts. I really feel I have an electrical problem. While researching online I came across a helpful website that has a partial service manual for the 8000 series Dometic that I could download.    http://bryantrv.com/docs.html It has nice colored pictures and trouble shooting aids. It shows there is a 1 amp fuse on my circuit board (on top of fridge) that feeds the "burner control device" which feeds the gas solenoid and igniter. I was really hoping that I just had a blown fuse, but it was good. The manual also describes which lead to check for voltage ,etc.. It also goes over how to hold down at the same time both the "Mode" button and the "Temperature setting button" until all 3 Mode LEDs light up (gas ,12v,110v). Once they do you then push your temp button to make them light up. The number of temperature buttons lit correspond to service checks you are performing. I found this to be quite helpful , though I still have not solved my problem.
   One thing I think I need to check out, is that the porcelain insulator was broken on the igniter. I wondering if that could cause it to short out and not spark ; and maybe if does not spark, the gas valve won't open. Does anyone know? Has anyone had a similar situation. Thanks. Macdad

Glad you got it up and running..