Dwf70 Error code A05 comes up after3-4 mins working after the first flush of water through waste pipe. Can I rectify this problem

at this point it indicates a blockage in the pipes after the bottom pan
could be tree roots, waste, grease and fats from the kitchen /bath
try using a quality caustic soda product to destroy fats , waste and other organic material
other than that get in a plumber with a worm and cutter to remove build up/ roots from the pipe
if this problem is new in an established system it needs cleaning out but if is new in a new house , get a plumber to rectify the plumbing layout

wow what is error code 9 no crystal ball we need make and model to track an error code F9 any code F is always within the cycle

sounds like a bad pump too waist or its jammed with a cothes wires bits or a coin or perhaps the kids posted a plastic hotel or house a metal charicter or some wand or bit of a game too the soap drawer

so they are now in the filter
take out the objects
and flush the machine thru with a 1/2 load 30deg wash with no load
and let it all flush through
then clean the filter again

F9 is usually the water isnt being pumped out
or detected as pumped out
fast enough

so its the waist pump or rubbish in the pipes

Got a blockage in your out pipe, could be a rag or a big tur. You need to snake out the main drain going out of your house.

If this is an outdoor spa near trees, its almost a guarantee that the impeller is blocked with debris (pine needles can cause this in a hurry)

If the impeller is clean of debris and this is still happening, replace you pressure/flow switch.

need more info

Hi,
"Error A05 - Pressure switch has not been reset "

This is centered around the filter and drain area not working properly.
It is possible it just needs the filter cleaning and the hose flushing out, but also possible the pump needs to come out to clean it properly.
Drain it by putting the hose low down, and clean the filters of debris.
If this does not fix it, then remove the unit outside, lie on it's back and remove the pump to clean it.

Hello Sir,
This error code, " F4 " comes only when the waste outlet is totally clogged with waste and blocked. Try to dismantle the machine and locate the Waste outlet pipe and thoroughly clean it. This will reset the error which is caused.

Thank you Sir, 
Have a nice day.

If there is a air emiten valve on vent ? Remove it than try to see if it works properly. If this works you will need pipe vent outside

Set the controls to off then power off at the mains for 30 mins and then power mains back on and run a drain program or a full wash program. If the water won’t drain away then the most likely problems are the door interlock switch is faulty, the drain water motor is faulty, there is a blockage in the drain outlet pipe or filter – this will need unblocking, there is a blockage in the water pump – this will need to be unblocked, the controller board is faulty – but this generally shows an error code. First turn off the mains power to the dishwasher then check the internal filter and screen and clean it thoroughly. Then check the waste water hose and any outlet valve and make sure that it is unblocked and free of any obstruction or waste material. If you have access to the water pump you can check that it is free of obstruction and is able to turn and that none of the impeller vanes have been damaged. Then if all this is OK then try turning on the mains power and running a hot wash cleaning cycle to flush out any remaining sludge / debris.