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I went with the fig 4 (Hot Water valve only valve) . It worked a treat. Appreciate your help. I didn't realise a wireless phone could create so much interference.

Really helpful. Thanks I've found the relevant video but im stuck on the second part of process. I dont know if I have an S plan or a figure 4 system? Is there a way I can tell?

Is there a reset process? If I press the button it does allow for the hot water to be controlled manually.

Sorry should have checked boiler first. No activity there though I must be making headway as I now have a solid Red light.

Superb, thank you, after doing a reset 15secs and 5secs press I now have a solid red light. I have had some issues that I thought were causing problems with other wireless devices so I bought a 5G /2G router as I suspected my cordless phone had started causing problems. I had moved most devices to ...

Its the box on the left. NB this has been working fine for over a year so seems strange that it should now have a comms issue. Nothing has moved. Appreciate help.

Hopefully this is the relay box. It seems to be where a wire from the flashing unit is wired into.
Thanks

My system seems to have recently lost communication to the ATF500DHW. I now get a slow flashing RED light and need to manually press the button to turn the hot water on and off.
The system displays the temperature accurately so some communication must be occuring. I also do NOT get any wireless comm ...

Mine are 45cms apart.

Mine appears to stay on beyond the Off time. Cant think its a wireless problem as I have had no errors and it generally is okish. Its also next to the Hot Water module which works flawlessly.
More importantly my likely savings in Gas have actually turned into nearly double the equivalent period cost ...