My aldi wet heating system heats the water up fine but doesn't heat the caravan up on electric any ideas it's getting cold now

Most likely it’s a propane heater. first make sure your propane tanks are turned on and then turn your heating on just like you would at home via the thermostat

your igniter might need to be cleaned. check it and see if there is build up on it. also if you have a volt meter. check voltage. as long as there is at least 10.5 volts to it. thats ok. need more info. it could be the board. but seems like a voltage problem

Does the refrigerator work on propane and not while plugged into shore electricity?

If so, the electric heating element (most likely) or something in the control system has fiailed. I presume switches on the refrigerator are in the correct position "auto".

Heating element can be easily checked with an ohm meter (power to the unit OFF) but replacement can be tedious.

After this many days, unlikely you have not solved the problem.

Heating pads?
Water heaters either have an electric element or a gas burner coil or both. No pads.
Please include your RV make, model and year for appropriate assistance.

Greetings and good health to you.
Ok, so I'm guessing by low you mean quantity and not temp, correct?
Does the cold water sputter as well? If so, most likely bad pump but we'll go with it just being the hot water for now.
Does the hot water act the same way on the other sink faucets? If not, the hot water is flowing freely without sputter, the problem will most likely be in the tub's hot water valve (knob) or the shower attachment. You can replace these rather easily.
If your hot water is low in quantity and sputtering only on the hot, then your hot water tank is not getting enough water to it which will cause it to be "low" and sputter as there isn't any water in there to pull from. If this is the case, we need to figure out what is causing the hot water tank to not have water in it.
Your pump is obviously working as you are only having issues with the hot water. Since using the hot water would normally use what hot water is sitting in the tank and thus pull in fresh water to heat up as the hot water exits. This would be the case if you are using the on board water storage and not hooked up to a hose for your water supply.
So, if this is the case, we need to find out where/why the water is not drawing in from the water storage to the hot water tank. First off, locate both tanks and make sure there isn't a valve on the water line that may be turned off or almost off. Check those water lines for any breakage or leaks. If not, if there are two lines coming out of the water storage, one for the cold and the other for the hot, see if you can notice anything in the water tank that may be blocking the "hot" line.
If all that is well, lets look at the water heater itself. I'm guess you would have noticed if this was leaking which is why I waited until now to bring it up. If you go outside and open the panel, does it look like it could have been leaking? Look at the plug (this is where your heating element is located) at the bottom center of the tank. Does it feel damp or can you see streaks going down from there? If unsure, hook up your hose to the water intake and turn it on. Watch the tank from the outside and see if it starts leaking. If it does, bad plug (heating element) easy and cheap to replace.
Once you see there is no leaking coming from the hot water tank, lets take out the heating element to make sure it is filling up. First shut off the water flow. You'll need a large adjustable wrench or if you happen to have that big of a socket, go for it. Remove the element. Water should start coming out as you unscrew it. Once you remove the element, water should flow freely out until empty.
Now, with the plug out, turn the water back on and see if it flows out of the tank. This will show flow is good up to this point.
Ok, so if there are no leaks thus far and the hot water tank is filling up when you hook up a hose, then we need to look and the connection line going from the tank to the rest of the faucets. Put the plug back in. Turn the water on again and follow the lines from the tank to the faucets looking for leaks.
Once you do all this, you should have an idea of what is happening where and possibly how to fix it.
Let me know how it turns out.

Water heater must be FULL of water first. Be sure to bleed all air out of hot water lines all throughout the unit. Check water in heater by purging the PT valve at the top. (The one with the little lever). If no water comes out, there is no water in the heater. You can't heat water is there's none in it to heat!

check to see if setiment has settled on the pilot....blow it out with air if it has. This issue comes up often with water heaters and rv refers. If that is not the problem and the pilot remains lit, but never increases when the thermostat is turned up, you probably need a new gas valve/thermostat.

Plug in a ceramic 120 volt or oil type space heater to keep trailer warm. Most travel trailers are propane only, they do not have electric heat strips. I would bet that is why it only blows cold air.

Are you talking about onboard furnace? Should be propane fuel heated. Do you have propane turned on?

there should be a small black box transformer wired into the ac cord
that goes to your standard plug
the transformer should then have wires going to your heating element
If someone has removed the transformer just order a 110vac to 12v 12 amp transformer and wire it in like you would a doorbell
when the transformer is working you should feel heat at the rear of your refrigerator at the heating element