Potterton netaheat profile 80e - not lighting UP

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Getting cool, hmmm now its cold... stopped sometime this afternoon.

When demand comes on the fan (and pumps) run fine, feeling outside by the flue there is a fair draft.
I'm pretty sure the quiet click by boiler controler I hear is the air pressure switch on OK but nothing else happens, no clicking of the ignition etc.
3 wires on pressure switch: more to the center is the live/brown?
two wires at top, white and orange.
The central wire showed live, only one at the top (white I think) indicates live with tester screwdriver.
Quite hard to get to (2, red) gas solenoids to test but I think NO lives on any of the 5 wires.
PCB looks ok, no scorches etc
Pressed the reset button - no change

Suggestions re good contacts (Bromley area)?
Suggestions what to check?
 
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If you are competent you could measure the resistance of each gas solenoid.

Tony
 
Multimeters (we have 3 or so) seem to go missing with the kids, I'll have a search in the am.
Any ideas about what the live wires on the air pressure switch should be - I wondered if only white meant low pressure [orange showing a higher pressure?] and perhaps the fan a bit slow/inefficient. It is, as usual, quite rattly/noisy (not normally an issue as it is in the garage).

Assuming I can get a decent reading what range is OK across which pairs of the three (top left, bottom left, right as I look at contacts)?

Should they actuate and that then set ignition clicking?
I imagine it only feeds gas when it knows it has ignition guaranteed - or is one solenoid for a pilot and then the other main?
Or another cunning plan?...
Many thanks so far...
 

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