Hi my name is Brian. unfortunateley this information is only given out from the manafacture on production of proof of ability to work on boilers either gas safe or oftec. which probably is why you have had no replys on here. I would call your engineer back as he clearly has not set it up properly, or ask him to cancel the Service interval timer. I unfortunately only have the details for a Danfoss SI so cannot help you any further. If you would like this question cancelled please do not hesitate in contacting a moderator. I apologise for not being able to help anymore, but strongly feel that the engineer should take responsibility for this problem.