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There are many threads on the Girard Tankless. I posted the suggestions below that I have posted numerous times. This will help with your hot-cold-hot problem.
Now if you are in a part of the country where the incoming water is warm to begin with such as Florida, Texas, Arizona, etc., the water will heat up very quickly and can overshoot the set temp. If you have already tried setting the temp to the high 90's and it still goes well above the set temperature, you should try making sure the flow control valve on the back of the Girard unit is wide open. If it is partially closed, it will allow the water to remain in the heat exchanger longer. Slowing the water flow slightly is fine in winter months or cooler climates but not when the incoming water is already warm.
If you find the flow control valve is already wide open, you can try mixing just a little cold water... if and only if..... you have a minimum of 45 - 50psi water pressure.
Here are the primary issues causing hot water problem with the Girard Tankless Water Heater in order of most common occurrence.
1) 50% of the time the issue is related not enough water flow due to poor water pressure. You need at least 45PSI of water pressure coming into the coach. Many campgrounds have poor water pressure. You should be using a pressure regulator for incoming water to protect the coach from too much water pressure so look at the gauge and see what your water pressure is reading. See if you can adjust it for 45 - 50PSI if it is below that pressure. If you don't have a regulator or the campground isn't supplying at least 45PSI, try turning off the city water and using your fresh water tank instead and see if the hot water works properly.
2) 30% of the time the issue is people mixing cold water with the hot like they do at home and not setting the thermostat to the desired temperature and then only opening the hot valve for water. Do not open the cold water or use the water elsewhere in the coach when using the hot water. This causes the pressure to drop and the tankless will cut out if the flow drops too much.
3) 10% of the time the issue is related to construction debris in the water line cause the strainers (screens on the faucets and shower) to become blocked and restrict the flow. There is also a strainer / screen at the water inlet to the back of the unit. This can also become blocked with debris. Thor does recommend removing this strainer in cases where people are having flow issues. The house water system filter is before the tankless so assuming there is no construction debris in the water line coming into the tankless, the strainer should not be be needed.
4) 5% of the time the incoming water flow valve on the back of the Girard Tankless unit needs adjusted. When the incoming water temp is very cold, then slowing the flow will allow the water to spend more time in the heat exchanger to heat up enough.
5) 5% of the time it could be one of several other issues such as.... there is an actual problem with the tankless unit.... there is a bad faucet cartridge and it is allowing cold water to leak and mix in with the hot water.... there is a kink or some other blockage in the plumbing restricting flow.
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