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As long as it is a 24 volt A/C system, which most are (look at the old thermostat in your RV) , and as long as it is a digital thermostat. Do NOT use one with mercury in it like the old round brown Honeywell that everybody has. The non-digital thermostats that use "snap-action" springs can be used, but they are mostly junk. Spend $35 on a decent digital and you will be fine.
what type of t stat? if mercury bulb type make sure base is level on wall. If snap action line voltage replace it. If digital make sure cycle rate for your type of system is set correctly, and the ovious is it in a drafty location or being affected by a heat producing item being placed near it .
These are simply a snap and push type of assembly in most units. You can find the shaft area of the sprayer arm and push and snap it back in place. You might need to use a slight tightening arm action to lock it into place - that is - unless you have any broken plastic pieces found in the unit. Then you need a new sprayer arm completely.
Someone stated this problem was a resistor located in the neutral side of power cord. That is where the problem is. However, it is actually a thermalink fuse rated at 10 amps. The heater pulls more than 12 amps. I wonder how many of these heaters have ended up in a landfill because of this manufacturing flaw!
One of the two small thermostats, that are called "snap-action disc thermostats" and control the electricity flow to the fuser lamps, has likely gone bad. If you are feeling generous to the money pit governed by Konica-Minolta, you'll need to replace the fuser unit. Otherwise, you'll probably need to locate and replace the bad thermostat. If you are not electronics saavy, I recommend taking the fuser unit to an electronics shop and asking them to check for and replace any bad thermostats.
As an explanation, these thermostats work just like the thermostat for a typical home central heating system. While in use, they keep the fuser temperature between 130 and 150 degrees by turning the fuser lamps (the parts that heat up the fuser) on and off. They do this by allowing electricity to flow to the fuser lamps until the temperature of either thermostat reaches 150 degrees. Once that happens, the thermostat will turn off electricity to the fuser lamps, allowing the temperature to cool back down to about 130 degrees. Once the temperature returns to 130 degrees, it allows the electricity to flow again to repeat the process.
I was able to get a replacement 5 amp MB-1 push to reset circuit breaker for my Flowtron LE-900 directly from Snap Action http://snapaction.net/ for no replacement cost and no shipping/handling cost. No one at Snap Action enquired as to what it was for, age, warranty, etc. (their MB1 product description indicates it to have a lifetime guarantee). I just had to mail them the defective original breaker - took about 2 weeks to receive the replacement.