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Just in case anyone in the future finds this thread and the enclosed sheets from danfoss do not make specific mention of it: If there's no preheater fitted you need a link between terminals 3 & 8 otherwise it's an instant lockout from your new control box.

Yes the link was needed and other than working out how and why the motor feed looped through the control panel it went well enough. That price (£88) was fully inclusive of everything, the total cost of parts required for a resolution. They dropped from over £100 because I spoke nicely to them...

Thanks for that. I'd already decided that it could only be a combination (of sorts) between the cell and control box, just really didn't know why or rather wanted confirmation. I'd spoken to Danfoss myself today trying to track down the cell and they repeated what the merchant had told me...

Yes it an LD

Thanks for the link, I had read a similar page previously. Unfortunately I didn't have an autoranging meter with me so I'm left a bit in the dark with the results. Would you say that 0.6M is high enough for a dark reading and 80K low enough for light reading?

I Hope the details above give you an idea about the state of the cell :)

To confirm the sequence, at 1st reset after lockout it pre-purges ? (just fan running) for apx 4 seconds then burner lights. Apx 8 seconds later lockout again. If it's reset after the 2 minute wait sometimes it just lights straightaway with no pre-purge? I torch tested the cell with it fisted...

It's on my growing list to do as soon as I get there (y) I've also got to find the control box part number as danfoss list a few variations of the modern equivalent with different functions included. I haven't seen part number on the cell up to now which won't help me. I will re-do the torch...

Still not back there yet, sorry :(

Just had another thought!! How much light is too much light for the cell prior to start up? This cell has a hard plastic flange to hold it in place but there's not a seal behind the flange. The hole in the burner is larger than the cell with a recess which under other circumstances I'd expect...

I don't think I've understood you 2 correctly:( If the cell sees light during pre-purge will it still continue through the rest of the normal start sequence, fan, solenoid, ignition, injection and then burn, followed by lockout? This is the sequence that's happening regardless of whether the...

I'm not near the boiler at the moment to check the control box number but it certainly looks contemporary with the burner and boiler. This set up has been working for the last however many years with no significant problems so unlikely to be a mismatch of components?

Worth a go, thanks. Can't get a replacement before Tuesday regardless.

No, I've found no reference for likely readings through the cell.

I meant at next start sequence once cell reassembled in burner (y)