Valliant ECOmax boiler is not giving me any hot water

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.

Could be divertor valve is faulty , stuck in Hot Water mode

It could be dyslexia, but I think you want to know what may be wrong with your boiler in this case!
This is a VERY old design. The diaphragm is on the water section, this operates a switch to turn ON the pump, and a further device causes the diverter valve to divert boiler water from CH duty to HW duty.
From your description it appears that the boiler is shutting down on internal boiler water temperature (too high), your 'briefly too hot' HW symptom may be caused either by the boiler side of the secondary heat exchanger being blocked/caked in sludge, OR the DHW side of it being scaled. Either way a new or replacement (descaled) secondary heat exchanger MAY inprove things. It's not easy on these old clunk-pots, and EVERY disturbed seal will subsequently leak, so get a good supply of o-rings and fibre seals before you start ("you" being the competant fitter you employ)

I HAVE LOST MY REMOTE THERMOSTAT AND CANNOT TURN HEATING ON. PLEASE TELL ME WHAT TO DO. MANY THANKS. ITS AN ECOMAX VALLIANT BOILER.

eiter you have a faulty filling loop or presure gauge,i asume you know how to put water in?

water must be set at 3lts a min ,check diaphragm valve move when hot tap is on, check microswitch ,best of luck

hi ian
most boiler manufacturers now days have downloadable manuals on there web sites.
just type in "vailant boilers" and flix through until you find the correct page. if they haven't a download you can request a copy on the "contact us" page .
i hope this has been some use