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Check the fuel filter on the units as well as the inlet and outlet filters on the back of the motor.
Watch the nose cone and see if the end starts to loose the glowing orange color before it quits. If the unit slowly looses the color then you have a fuel problem but if the unit just quits at full heat then you could have a electrical problem.
Typically the spark plugs on these heaters don't go bad.
The Pro 110 comes in 2 different technologies. The true model (examples: R110, RHD110T, etc) designates which technology your heater has. Rather than ask for clarification I am posting links to Troubleshooting Tips for BOTH types. You must investigate to see if your heater is the Spark Plug technology or the HSI (glowbar) technology.
Troubleshooting greatly differs between the 2 types.
the first thing you need to do is go back to useing K1 kerosene, diesel fuel not only burns dirty but also has a tendency to gel up in cold weather which could be makeing it hard for the heater to draw the proper amount of fuel. To reset the pressure you will need a gage, it should run at about 6-7 psi. you can order a pressure gage from mr. heater online, they are by far the cheapest I have found as they are the actual manufacturer or call 1-800-251-0001
check the photo eye. It's the little rubber boot on the bottom right on the back side of the burner. If it's dirty, it may not be shutting off the igniter. If the igniter runs continuously, the safety breaker will trip.
My best guess is that you are are connecting to your AC receptacle with an extention cord that is too small. The Reddy Heater contains a computer that will shut the unit off if it cannot pull enough amps from your service. The longer the cord the higher the loss from receptacle to unit. This loss can be reduced by increasing the size of your extention cord. I run a 100' 10/2 cord.