Hello Declan, my name is George,
Can you given me the Model of the appliance please
It is not critical at the moment Declan.. It sounds more like a heater problem.. Water not getting hot enough to disolve the tablet, or a distibution proble whereby water is not being distributed properly.
Investigate those two and come back to me..
Then if the water is hot in the tub then it is not the heater..
Check the distribution of the water... Take off the top spray bar (rotor). Give it a rinse out under a hot tap.. Poke the holes in it to ensure water can get through.
Let me know what you find.
Ok.. Let me know... but this appliance has an upper spray bar in its parts list..
There is another thing it could be so let me know when you are at the appliance.
Going back to my earlier comment:
"It sounds more like a heater problem.. .."
Please take the time to rate my assistance using the stars provided, as it is the only way I get credited for responding to you.