I'm thinking loose wire in the plug.
It was one of yours yes, had it a couple of years now.
I'm guessing its the plug on the end of the wire, as opposed to the PCB. I'm going to take a closer look on my next day off.
In message , "Simon (Dark Angel)" writes
Ah well, you know where I am
Hope your still reading this.
Well having done some tinkering today, I'm not sure but I think there might be a problem with the PCB.
When I "wiggled" (for want of a better word) either of the plugs that connect the temperature sensor or the boiler thermostat control to the PCB, the boiler would strike up.
Have removed the pcb and examined the solder connections, can't see anything wrong and have tested continuity between these plug and the back of the PCB and all seems well.
Was wondering if there's a break somewhere on the board that was connecting when one of the connectors was "wiggled" as it were?
Just trying to make head nor tail of the wiring diagram to see what else to test for (I have experience with electrics, but not electronic fault finding).
Quick addendum.
Removed the plug to the temperature sensor, tested the yellow wires, no continuity.
Removed the plug to the Temperature control and turned it to max. There was continuity between the 2 orange wires and continuity between the 2 white wires.
Removed the plug to the air pressure switch, tested the orange wires, no continuity.
Any ideas?
In message , "Simon (Dark Angel)" writes
Its only electrics where the fault lies from what you've said
If the connector pins and their pads on the pcb look OK (check carefully in good light), then the next port of call has to be the loom wiring. If you have a broken wire where it attaches to a connector, you won't notice it as the insulation is also crimped to the pin. Give the wire a gentle tug to see if there is any elasticity there
Also, check that one of the pads hasn't cracked away from the track it should be attached to on the solder side of the pcb. The Suprima pcb itself is a real cheap and nasty bit of kit
In message , "Simon (Dark Angel)" writes
That's because the temperature sensor has a resistance of 1MOhm at 20C. You need to test it with a decent meter
The pot will go from 0 - 1MOhm, the other two wires are to the switch. Not sure why they should be short circuit when the pot is set to max though, I'll check tomorrow
They are the common and normally open connections on the microswitch. When the fan operates the APS, the contacts will be short circuit
I tested it at 2M ohm, but will check again.
If I read the flow chart right, its supposed to be short circuit?
I reconnected the plug and turned the power on, was getting voltage on both pins if that's of any help?
With the plugs connected (and the power off) I checked for continuity between where the cable terminates in the plug, and the solder joint on the back of the PCB, and got a continuity reading on all terminals.
That tests the conductivity of the solder. A common failure on PCBs is that the pad lifts from the board and breaks the copper track that connects to the pad. You need to do the test between the pad and another on the same track and do a visual check with a magnifier. If its broken you will need to run a piece of wire to repair the track.
In message , "Simon (Dark Angel)" writes
Well it looks like you have something not giving a good connection in that area, or your fiddling is disturbing something else in the loom
It looks like its down to fiddling about and observation now
There's a bad connection somewhere, you just have to find it ... no mysterious or devious electronics fault, no need to go around measuring voltages and such like
In message , "dennis@home" writes
Dennis - you are entering territory where you know less than you know about most things you know f*ck all about
I on the other hand, really do know how to get to the bottom of this
so be a good boy and f*ck off and leave me to it
In message , "Simon (Dark Angel)" writes
Can you be in front of the boiler tomorrow
It might be worth you giving me a ring at work and I can lead you through in real time
01923 229224I appreciate the offer, however I don't get back from work till 530 pm :(
Don't suppose you'll still be available at that time?
In message , "Simon (Dark Angel)" writes
Unlikely
might be able to sort something out saturday
You are a pratt, what I said was perfectly true. Are you worried he might fix it without your help? You appear to have ignored such an obvious point.
Did you read that in the Ladybird book of electronics?
In article , Skipweasel writes
it's 'cos it's usenet and not a web forum.
I'm in all day Saturday if you'll be available on that number then.
In message , "Simon (Dark Angel)" writes
Ring me at work, I'll give you my mobile number
You never answer it!
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