The mixing valve is on the back of the water heater and mine has a red knob.
Atwood water heater mixing valve problems.
Drain the water heater by removing the drain plug then refill the heater.
I will be cleaning out the water heater more often now.
Tamper proofing glued allen head screw the knob to adjust output temp is pain to remove.
Problem seems to be solved.
Recommended cleaning procedure is to soak the mixing valve in hot vinegar to dissolve any hard water deposits blocking the screens.
This can happen if you have a weak gas control magnet or if the thermocouple needs to be replaced.
Yes can soak it in clr or hot white vinegar to clean and then rinse thoroughly.
Impurities in the water can cause your atwood water heater to malfunction.
Atwood has tried to make the valve tamper proof.
Check the water heater s vent and air grill for.
It took about 15 minutes of flushing my water heater before it ran clean with no chunks of crud coming out.
Atwood 6 gallon water heater unit is pre set at temperature 140 degree fahrenheit which is adjustable from 110 to 150 degree fahrenheit.
That s the tamper proof part of it.
There is still a check valve on the lower cold side so back flow to the fw tank.
Fired the heater up and with the new valve the water temperature at the tap is 130.
The problem is that the water heater thermostat is calibrated to make scalding hot water then the mix valve cuts that down to a more reasonable temperature for use.
This gives you more hot water than the capacity of the tank alone but adds to the complexity and maintenance issues as you see.
This unit is operated on propane gas and can only be ignited inside of the trailer using an on off remote switch.
Saves weight while fitting in the same cut out.
I had to remove the valve because i did not know they had put glue inside the screw hole where the torch bit went.
One of the most common problems with atwood rv water heater is a pilot outage.
Deposits build up in hot side of mixing valve can clog it up.
Ok so when you turn the valve and antifreeze fills the tank here is the fix.
Which is why its discussed in this airsteam forum and just about every other rv forum.
Sometimes you need to move adjustment back forth to clear.
If it is not too old hen you can try cleaning the orifice and see how it goes.
