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Further to my recent posts, I had a conversation with an engineer at Baxi/Potterton today so I'll update this thread with my understanding of his explanation for anybody else who may be searching the part numbers or boiler mentioned. The original Potterton Kingfisher MF PCB marked 407779 had 2...

Sorry yes, you're correct... I've edited my earlier post! Thanks.

Thank you for your comments MrTherm! My system is as you describe with a bypass valve fitted and all working fine with the exception of no overrun. It seems odd that the overrun timer is removed from the 407779-03 version of this board as this is indicated as a like for like replacement for...

I have been thinking about this and notice that the original PCB was part number 407779 and the replacement part is 407779-03. The new part has only one fuse holder and a hole where the other should be and according to the boiler manual the removed fuse is for pump overrun protection. Can...

OK let me give some background in the hope someone can help me with this old system: S plan fully pumped CH & HW controlled via 2 single actuator valves. Boiler installed 1998 and given pretty much trouble free service with the exception of the gas valve replaced around 2005, the Drayton SCR...

So I may have answered my own question here but I would appreciate if somebody can confirm as I can't get to the system until later and like to be prepared. 2 possible issues: 1) The user has simply locked the keypad by pressing yes & no together without realising. I doubt this is the case as...

Hi, I have a Texecom Premier Elite in a rental property which has been working perfectly for years (except a PSU fault which I fixed a while back) and 2 days after a new tenant moves in I receive a message that the RKP is locked. I have a vague memory of this happening previously with a tenant...

Ordered a new PSU unit (HAD-2000-3) through my local ADI Global and arrived next day. Trying to fit it without powering down the system or removing the panel was a challenge and I just unbolted the black 'transformer' and replaced the power supply and wiring rather than the whole unit as it was...

Service Engineer thanks, this is a hard wired bell box and I'll take your comments on board along with the fact my distributor has never sold a spare battery and I'll leave it for now. I dug out my install notes from when I installed the system and this is a grade 3 Deltabell Plus which claims...

Had a few things to sort out with my alarm recently and as the Deltabell is nearly 4 years old and on the original battery I want to replace. When I speak to my local distributor he said he has never sold a replacement battery for these? My question is how often are the batteries replaced as...

Our replies crossed, we are thinking on the same lines... Tuesday I'll get hunting the local distributors for one!

Update: Found that my local Toolstation sold Yucell/Yuasa batteries and had one in stock which put my OCD mind at rest. I replaced the system battery and within 10 minutes I had the mains error back. The battery needed changing anyway so I'm happy that this gave me an excuse to do it, I suppose...

V2.02 and both the problems you mention. The time issue is minor and I have a workaround which is OK, just annoying it does not work as it should without using the crystal and offset. The reoccurring mains fault is the major issue, I'm going to get a replacement (unbranded) 7Ah battery from...

So I could not wait and visited my property to perform my initial plan and first reports are not encouraging but at least ruling some things out. Within a few minutes of the restart the log showed a few mains fail events. There is no mains restore events with these so it can only be dropping...

I hate hijacking threads but I have an identical panel of similar age which I installed around 3 years ago and has been faultless to date. It is showing an identical fault and as the OP has not updated this thread maybe one of you could assist instead of re typing the whole thing out from the...