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Cheers Jo, job sorted. I tried this for users X003, X004 with no luck as I didn't know the existing codes. However this has enabled me to add two new user codes. I will leave the mystery codes. I did try the soft reset as previously stated but it didn't blank out all the existing codes. I didn't...

Problem solved but I don't know how as it just started working correctly after a day or so.

Hi, I have the above 16 zone panel with two 9930 keypads attached to an SD1 Menvier dialler. I would like to add another user to the system as per the user manual and find I cannot amend the existing codes apart from the two that I know are in the system. I believe a total of 8 different user...

I had a Vaiilant ecotec Plus 624 system boiler fitted in 2015. I installed the Vaillant VR66 control box and VRT350 programmable room stat. The system is S plan with one wired heating zone to the VR66 and a 240v cylinder stat to the VR66 with an inline switch to prevent DHW demand for the...