Duo therm 4 button tstat
Had mine repaired a year ago stopped working again while out camping. Hoping it won't end the trip,. I have seen a couple of ads for a conversion from a 5 button to work with this system,does anyone h...
Forum Discussion
I rebuilt the switches on mine and it works great now. Could have sworn I took some photos but can't find them. Anyhow, here is the write-up I worked from. It came from another RV forum.
jor
jor
For those with thermostats that still work but don't respond to buttons well, here's the fix, no soldering required.
It would take multiple button pushes to get my thermostat to switch mode, and it got frustrating. I've heard of disassembling the switches to clean them periodically but wanted a better fix. So...
An order to Mouser Electronics for new switches, I bought five @ $1.22 each. They are exact replacements.
Mouser number PVA10AH2
Mfg. PN: PVA10AH2
These are DPST momentary 23mm pushbutton switches.
Turn thermostat off. Remove the cover from the thermostat, it snaps on.
Remove the screws that hold the circuit board, unplug the cable from it. This is an electronics board so treat it gently and ground your body (touch something substantial and metal), don't shuffle over the floor in wool socks holding it etc. to eliminate any static charge before touching it.
Set it on a padded surface on the table and look at the switches. Break out the reading glasses. Using a small screwdriver or knife tip, you can release the retaining clips that hold the components of a switch together. Release clips, withdraw the top, spring and contacts, noting how they are inserted. They will only go in one way.
Now, take one of your new switches and do the same. Use the new parts in the old switch housing and snap the switch back together. You've just rebuilt the switch.
Five minutes max. It sounds far more complex than it is. There is a spring in the switch that can pop out, really doesn't matter though as you use the new spring. Repeat as necessary for any other hinky switches and carefully reassemble the thermostat.
I didn't take pictures of the procedure and it's pretty self explanatory once you look at it but can and will post pix if necessary. I enjoy this fix on a daily basis and hope you do also.
Chuck
A paperclip works great as a little tool to slide under and hook the metal contacts and put them in place. Whole job took about 15-30 minutes with learning curve. If I had to do it again, 5 minutes.
I recently ordered these switches from Mouser. Replaced contacts following your intstructions..
Thermostat works like new.
