Gallaf gadarnhau hefyd fod yr ymchwiliad wedi dod i'r casgliad mai problem gyda'r offer waliau tân oedd achos y digwyddiad. Cododd y broblem pan gafodd newid rheolaidd i wneud i wal dân. Mae gweithgynhyrchwr yr offer wedi cadarnhau bod y wal dân wedi ymddwyn mewn modd na ellid fod wedi'i ragweld ac na ddylai'r newid fod wedi cael effaith mor andwyol.
I can also confirm that the investigation found the cause of the incident to be a problem with the firewall equipment which occurred when a routine firewall change was applied. The manufacturer of the equipment has confirmed that the firewall acted in an unpredictable way and that the change made should not have had a detrimental effect.