Kuppersbusch boiler Boiler filling error

The BOF message on a Hobart Ecomax 652 dishwasher indicates a "boiler filling" issue, which means the dishwasher is unable to fill the boiler with water. Here are some things you can try:

1. Check the water supply: Make sure that the water supply to the dishwasher is turned on and there is enough water pressure. If there is low water pressure, it may cause the BOF message.
2. Check the water inlet valve: If the water inlet valve is not functioning properly, the dishwasher may not be able to fill the boiler with water. Make sure that the inlet valve is not clogged and is getting power.
3. Check the level probe: The level probe detects the water level in the dishwasher. If it is not working properly, the dishwasher may not be able to fill the boiler with water. Check the probe to ensure it is clean and in good condition.
4. Check the boiler: The BOF message may also indicate a problem with the boiler itself. Check the boiler to see if there is any damage or blockage.

If these steps do not solve the issue, it may be best to contact a professional technician to diagnose and fix the problem.

Hi,

Please restart your machine. Check pump pressure, boiler valve and the water supply. You can check the manual for more details. I believe it should be on page 9 and/or the table of errors.

Thank you.

Hi, your boilers pressure should be holding 1.5 bar with the relief set about 3. If the pressure is below this the flow switch will cause the boiler to stop as theirs not enough pressure to operate. Another thing, does your boiler have an auto fill system or do you need to plug a hose in to fill it? If its an auto fill system and you lose pressure you could have a leak.

Did you bleed the air from the pump ? Sounds like a air lock

find filler loop which should be near boiler it is connected to the main and connects to flow or return on your boiler and only fill to 1and a half millibars which is a dial on your boiler

Check that your make up water is on.

Make sure your fill valve is working but it sounds like it is not. Your min pressure should be 15 psig. on the boiler. Fill valve will maintain a15 psig on the boiler. Water and pressure does get out of the boiler when radiators are bleed. When fill valve is not working people will keep bleeding the radiators trying to get heat but only lowering the boiler pressure with no water make up.

Make sure your boiler is getting water and has pressure when running.

If it isn't...SHUT DOWN and have a professional look at it.

Pressure relief valve is factory set ta 30 psig and opens when pressure is above 30 psig. This is a safety valve.

fill the boiler with dry fine sand.that way it can be hoovered out if you need to connect it later. dont run it dry

The boiler should have a make-up water connection from the home cold water supply line. Depending on when it was installed it will have a back flow preventer in line before the pressure reducing valve. The pressure reducing valve is designed to fill the boiler if the water pressure in the boiler falls below a specific set point, usually 12-15 pounds. I will be piped to the return side of the boiler in most cases. If the boiler is not filling the PRV could be defective, or depending on the specific controls, there could be a low water float assembly, either electronic or mechanical that activates a control valve to fill the boiler and that may be either stuck or defective. Boilers should be properly maintained at a minimum of every other year, once a year is best to ensure that you get 25+ years of operation from them.