Alde propane failure - stuck gas valve - fixed!

rh5555 · November 15

Two days before our annual pilgrimage to Arizona in search of the sun, I discovered our Alde wasn't working on propane. I checked all the posts I could find, but none of the solutions in the forum helped. I could hear the clicking of the igniter and the blower was working as expected, but the propane never lit. I checked that propane was getting to the unit, but I never smelt any propane in the exhaust. I came to the conclusion that the gas valve wasn't opening, so with one day in hand I tore into the unit. Here are the steps if this happens to you:
First problem on my TAB400 is that you cannot get the Alde access panel off, as part of the woodwork gets in the way. An oscillating saw let me remove a section:

The access panel then comes off (after disconnecting the wiring) by removing 3 screws to reveal the innards.
To remove the gas valve, you need to undo the two gas line connectors arrowed in red, 6 electrical connectors, one rubber hose and 3 (if I remember correctly) screws:

You can then wiggle the gas valve out. Next you need to remove the remaining gas line and rubber hood to give access to the screws beneath

Remove the 5 screws around the solenoid (2 of these require a security style Torx 15 driver) and lift off the solenoids and cover tubes to expose the pistons. These pistons are supposed to lift up when the solenoids are energized to allow gas to flow. One of mine was stuck in place but came loose with a little jiggling.
There is a third solenoid off to the side which can be similarly accessed - mine seemed fine.

Image: https://us.v-cdn.net/5021717/uploads/editor/vr/5oc4qfamn8ud.jpg

Assembly is just the reverse of the steps above. Make sure you get your gas connections tight!
So my Alde gas failure boiled down to a single stuck gas valve which freed up easily and everything works again. Much cheaper than a replacement valve assembly that runs about $500!

pthomas745 · November 16

This is...very cool! Thanks so much for the write up.

To get the "hatch" off, are those screws that allow the hatch to lift out also the Torx 15? I seem to remember having to get that off when I lost a fuse holder back there in the abyss one day.

rh5555 · November 16

Yes most, if not all, the screws are Torx 15. 2 of them are the "security" style that need a Torx driver with a hole in the center to avoid the pin:

Image: https://us.v-cdn.net/5021717/uploads/editor/z3/1pe3ihkmvyfs.jpg

SavvyNurseCamper · November 16

So question ? Was there anything you could do to prevent this from happening again? I would hope you don't have to do this every year.

rh5555 · November 16

The trailer had not been used for 18 months prior to this episode. To avoid this in the future I will run the Alde on gas regularly (like every 6 months or so). When the piston freed up, it felt like it had stuck itself to a rubber seal. Also, with 20-20 hindsight, it might be possible to access the pistons without removing the gas valve from the Alde.

Tabaz · November 17

Excellent write-up and photos. I do not want to have to go through this. Will take your advice and run the unit on propane every few months.

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Alde propane failure - stuck gas valve - fixed!

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