So I had some interruptions but did start working on the refrigerator this afternoon. Had the manual with me Service manual for RM7030 and RM7732
(Note, this PDF is tied to a web site and is a pain in the neck to try and read on the computer, I printed it out so it does not keep asking me if it is ok to go to that web site)
Page 4 trouble shouting item 5 No Gas operation / operates on AC It wants you to go to section 6 LP gas which is missing from the manual, so .... I went on my own and this is as far as I got.
This is the outside cover.
Note the edges, it appears the whole cover has been removed at some point.
See that paint around the perimeter has been cracked.
The access bolts were turned 1/4 turn and the center cover was removed
The bolts that hold the wind guard plate in place were not accessible.
I removed the three screws across the top, popped of the covers of the screws on the side and removed those screws, and removed the two screws on the bottom of the outside access cover.
The outside frame had been glued in place so I used a box cutter to cut the silicone that had it glued in place and carefully pulled the outside frame off. It was not easy.
What you see hanging from the opening is the silicone that was in between the back of the outside frame and the side of the Motor Home.
There was also a very thick layer of silicone between the base plate of the refrigeration unit and the outside wall of the motor home. I pulled this out as well. I will clean the steel frame , paint and reseal when I put the unit back together.
Note, the chassis, motor home batteries were shut off, the motor home shore cord was not plugged in and the generator was not running, the gas valve was shut off.
So now the access cover has been removed, the outside frame has been removed, all the silicone has been scraped an removed, now we can get to the screws holding the wind guard in place.
Wind guard has been removed, we can now see the flue, the gas solenoid, the electric heater (in my case there are two electric heaters)
The paper tag says not to try and remove any nuts without using a back up wrench, see below.
The cover on the burner is just snapped into place and is easy to remove.
The electrode is held in place by one screw and is also easy to remove, pretty dirty.
Time to remove the entire burner unit and to do so the gas line needs to be separated, note the back up wrench used to keep from twisting the gas line.
Here is the burner unit removed, not really all that dirty.
Now I can get a close look at the thermalcouple. The end was burnt right off.
Here is a shot looking right at the end of the thermal couple, look close, it is in the center of the picture and the only thing in focus.
I'm not sure this is the problem , the symptom I should have with this is the unit should fire up, and then when the board does not see the thermocouple signal it should shut down. What I get is the unit gives me the check light, and if I retry several times it will then work.
It does need to be replaced so I called Dometic, they need the unit number, serial number, and model number.... 921 1480-08, 61900342, RM7732, they supplied the part number 2931826024, price was $50.00 with a minim shipping cost of $25.00.
I did find one e-bay, a part labeled as 2931826016MC for $26.00 but I believe in name brand parts so the Dometic part is on the way (it was in stock and will be here in two days, by normal UPS)
It was suggested that by dougrainer (one of those Service Center Techs), that I check the control module.
He said to Look at the epoxy that the resistor and such are mounted in. IF the Epoxy is Yellow/Beige, REPLACE the control module. Dometic had bad modules 20 years ago and the symptom was intermittent check light and no fire on LP. If the epoxy is greenish, then your module is current.
I did not find any epoxy, this is what the board looked like.
This is as far as I got, tomorrow I will clean up the parts I have removed and see if I can get the unit to fire.
More to come
(Note, this PDF is tied to a web site and is a pain in the neck to try and read on the computer, I printed it out so it does not keep asking me if it is ok to go to that web site)
Page 4 trouble shouting item 5 No Gas operation / operates on AC It wants you to go to section 6 LP gas which is missing from the manual, so .... I went on my own and this is as far as I got.
This is the outside cover.
Note the edges, it appears the whole cover has been removed at some point.
See that paint around the perimeter has been cracked.
The access bolts were turned 1/4 turn and the center cover was removed
The bolts that hold the wind guard plate in place were not accessible.
I removed the three screws across the top, popped of the covers of the screws on the side and removed those screws, and removed the two screws on the bottom of the outside access cover.
The outside frame had been glued in place so I used a box cutter to cut the silicone that had it glued in place and carefully pulled the outside frame off. It was not easy.
What you see hanging from the opening is the silicone that was in between the back of the outside frame and the side of the Motor Home.
There was also a very thick layer of silicone between the base plate of the refrigeration unit and the outside wall of the motor home. I pulled this out as well. I will clean the steel frame , paint and reseal when I put the unit back together.
Note, the chassis, motor home batteries were shut off, the motor home shore cord was not plugged in and the generator was not running, the gas valve was shut off.
So now the access cover has been removed, the outside frame has been removed, all the silicone has been scraped an removed, now we can get to the screws holding the wind guard in place.
Wind guard has been removed, we can now see the flue, the gas solenoid, the electric heater (in my case there are two electric heaters)
The paper tag says not to try and remove any nuts without using a back up wrench, see below.
The cover on the burner is just snapped into place and is easy to remove.
The electrode is held in place by one screw and is also easy to remove, pretty dirty.
Time to remove the entire burner unit and to do so the gas line needs to be separated, note the back up wrench used to keep from twisting the gas line.
Here is the burner unit removed, not really all that dirty.
Now I can get a close look at the thermalcouple. The end was burnt right off.
Here is a shot looking right at the end of the thermal couple, look close, it is in the center of the picture and the only thing in focus.
I'm not sure this is the problem , the symptom I should have with this is the unit should fire up, and then when the board does not see the thermocouple signal it should shut down. What I get is the unit gives me the check light, and if I retry several times it will then work.
It does need to be replaced so I called Dometic, they need the unit number, serial number, and model number.... 921 1480-08, 61900342, RM7732, they supplied the part number 2931826024, price was $50.00 with a minim shipping cost of $25.00.
I did find one e-bay, a part labeled as 2931826016MC for $26.00 but I believe in name brand parts so the Dometic part is on the way (it was in stock and will be here in two days, by normal UPS)
It was suggested that by dougrainer (one of those Service Center Techs), that I check the control module.
He said to Look at the epoxy that the resistor and such are mounted in. IF the Epoxy is Yellow/Beige, REPLACE the control module. Dometic had bad modules 20 years ago and the symptom was intermittent check light and no fire on LP. If the epoxy is greenish, then your module is current.
I did not find any epoxy, this is what the board looked like.
This is as far as I got, tomorrow I will clean up the parts I have removed and see if I can get the unit to fire.
More to come
