duromax xp12000eh troubleshooting

Duromax XP12000EH Troubleshooting: A Complete Guide!

Like all other generators, Duromax XP12000EH also shows some common problems from time to time. With some simple solution, you can repair most of them by yourself. 

So, what’s the basic Duromax XP12000EH Troubleshooting?

If the Duromax XP12000EH doesn’t start, make sure the engine switch is off and the generator is placed on a level surface.  Also, make sure it has enough fuel, the choke is closed and the valve is open. If your Duromax XP12000EH shows no electric output, make sure the circuit breaker is on. If the generator doesn’t support a connected device, ensure that the generator is not overloaded. 

To know these solutions in detail, keep reading.

duromax xp12000eh
Source: Electro Garden Tools

Duromax XP12000EH Engine Will Not Start

The engine of the Duromax XP12000EH generator will not start due the reasons below. 

The generator Is Not LevelKeep the generator on a leveled surface 
The Engine Switch Is “Off”Turn on the switch 
The Fuel Valve Is “Closed”Turn on the fuel valve 
Choke Is OpenClose the choke 
The Engine Is Out Of FuelRefill the fuel tank 
Low, Old, Or Contaminated OilReplace and refill engine oil
Spark Plug Is Dirty Or BrokenClean or replace the spark plug

If you’ve checked all of the possible causes and still having trouble then, you need to take it to a qualified mechanic. 

Reason 1: The Generator Is Not Level

When you run the generator on an uneven surface, the oil level also remains uneven. As a result, the oil sensor misreads the oil level to be low. 


Make sure you are running the generator on a leveled surface. If you must keep the generator on a sloped surface, insert some cardboard or wood piece under the slopped leg of the generator. 

Reason 2: The Engine Switch Is “Off”

Sometimes, the generator owners forget to turn on the engine switch and wonder why the generator won’t run. 


Make sure the Duromax XP12000EH generator engine switch is turned On. Set the generator’s engine to the “Run” position. 

Reason 3:The Fuel Valve Is “Closed”

If the fuel valve of your generator is closed, it can not supply fuel to the start during the combustion process. 


Turn on the fuel valve of your Duromax XP12000EH. In the Duromax XP12000EH generator, the valve is located above the recoil start under the fuel tank. Turn the valve counterclockwise to turn it open.

Reason 4: Choke Is Open

If the choke is open when you start the generator, the engine won’t start. 


Close the choke on your generator. You will find the air filter on the left side of the recoil start. To close the choke, slide the lever to the left. 

Reason 5: The Engine Is Out Of Fuel

Check the fuel level on your generator. If the fuel level of your generator engine is low or runs out, the Duromax XP12000EH generator won’t start


On the fuel tank, there is a mark to indicate upper and lower levels. If the fuel is below the lower mark, refill the fuel up to the upper mark.

Reason 6: Low, Old, Or Contaminated Oil

If the oil level on your generator is low, contaminated, or stale, it can restrict the generator from starting. This automatic shut-off system due to an oil problem protects the engine from damage. 


Check the oil level of your engine as follows. 

  1. Unscrewing the dipstick cap
  2. Clean the dipstick so there isn’t any oil
  3. Inserting the dipstick into the oil tank. If the dipstick is dry, that means the oil level is low and you have to refill the oil tank. 

Duromax recommended changing the oil every month or every 20 hours of use. To get rid of stale, old, or contaminated oil, change the oil as shown in the following video.  

Make sure to use compatible oil only. The best type of oil for the Champion generator may not be the best for DuroMax. 

Reason 7: Spark Plug Is Dirty Or Broken

When the spark plug of your generator is dirty or broken, it cannot ignite the combustion. As a result, the engine refuses to start.


To fix the spark plug issue, follow these instructions; 

  1. Pull the spark plug cap to remove it.
  2. Take the e spark plug wrench that comes with your generator and unscrew the spark plug. 
  3. Visually inspect the spark plug. If the plug is cracked, chipped, or worn out, you need to replace it. Make sure you replace it with a compatible spark plug.

Even though all from Champion brand, RC12YC, RC14YC, and XC12YC plugs are different. 

  1. If the spark plug is dirty, take a wire brush and gently clean the plug. 

Duromax XP12000EH No Electrical Output

If you are facing the generator runs but no electrical output here is the most possible reasons with their solutions. 

Circuit Breaker Is OffTurn on the circuit breaker 
The Wiring Connection Is BadChange the extension cord
Malfunctioning Connected DeviceRemove the malfunctioning device 

Reason 1: Circuit Breaker Is “Off”

If the circuit breaker of your generator is in the “Off” position, you won’t get any electronic output.


You have to turn the circuit breaker On. The circuit breaker on Duromax XP12000EH is located on the front power panel’s right side. Flip the lever up to turn on the circuit breaker.

circuit breaker on Duromax XP12000EH

Reason 2: The Wiring Connection Is Bad

The wiring connection or the extension cord that is connected to your generator can be faulty. And as a result, you may not get any electric output.


Try using the generator with another extension cord. If everything works properly, that means the extension cord was faulty.

Reason 3: Malfunctioning Connected Device

The Device you have connected to the generator can be  Malfunctioning. And as a result, you can face this No Electrical Output problem even though the generator is running. 


Disconnect all the devices from the generator and check them individually with another power supply source. If the device doesn’t work, you have to repair that particular device by a professional electrician.

Duromax XP12000EH Does Not Support Connected Electrical Devices

Sometimes, the Duromax XP12000EH generator will not support the connected electric devices. There can be several reasons for that which are as follows. 

Generator Is OverloadedRemove some of the devices 
Devices Connected To the Generator Is BadRemove the malfunctioning device 
Air Filter Is DirtyClean or replace the air filter 

Reason 1: Generator Is Overloaded

If you have used too many devices in your generator, the generator gets overloaded. And then it doesn’t support electrical devices. 


Remove some of the devices connected to the generator. Make sure the generator is only backing up devices according to its capacity. Find out what your 12000w generator can run and use devices according to this. 

Reason 2: Devices Connected To the Generator Is Bad

If the connected devices are bad, the generator can not support the devices. 


This has the same solution as mentioned above. 

Reason 3: Air Filter Is Dirty

If the air cleaner or air filter is dirty, it can cause the Duromax XP12000EH generator to not support the connected devices. 


You can soak a sponge in detergent water and clean the filter.  If the filter is too dirty, you need to replace it. 

Also, follow the regular DuroMax generator maintenance for avoiding generator issues. 


Here goes the Duromax XP12000EH troubleshooting guide. If you face this common problem of this generator, now you can easily solve those problems. 

If your generator starts acting too weird or you don’t know how to fix it, consult a professional. Also, don’t forget regular maintenance. 

That’s all for now. Have a great day!

Frequently Asked Questions (FAQs):

What Type Of Oil Should I Use In My DuroMax Generator?

You should use 10W-30 oil in your Duromax generator as the manufacturer exclusively recommends this. You should not use another type of oil in this generator as it can cause many problems to the generator. 

Where Is The Best Place To Store A Generator?

The garage is the best place to store a generator. A shed is also a great place for this. Make sure the generator is not exposed to too much dust and moisture. If you must keep it in an open place, use a generator cover to protect it from dust and water.

How Much Ventilation Does A Generator Need?

The generator needs at least e 3 to 4 feet of clear space around each side of it. And there should be proper airflow in the location. Otherwise, the generator will overheat and damage the engine. 

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