GlowWorm Compact 80/100 PCB

[gas4you]

Tony has already replied that the resistor has overheated and the colours are not clear anymore.

For some reason this post has gone missing, or perhaps was in the combustion chamber or somewhere else

 

[bengasman]

i thought it was a bit unlikely he does not know the colour code.
i assume that whoever can give him the value will get it from the code as you can not measure the resistor when it is on the board

 

[Agile]

You can measure it on the PCB because its in series with a diode.

When its on the boiler its a 1 W on the front left to the left of the pump relay.

I dont think its used on anything else other than the GW Compact.

Tony

 

[bengasman]

You can measure it on the PCB because its in series with a diode.

i take it you mean you can see on the board it does not have any possible connections parallel?
suppose that if it is 1 ohm, parallel paths do not matter that much.
you will need pretty expensive tester to measure that acurately though. your average multimeter would not be good enough i reckon. megger job more like it.

 

[Agile]

Its in series with the mains supply so its going to be in the range of 5k to 15k.

Just 1 ohm would give 230 A and probably blow the supply fuse from the REC !

Tony

 

[ChrisR]

What's it in series with?
If a relay, what's the operating voltage marked on that?
Should be easy to work out about what the dropper resistance would be.

 

[Agile]

Not quite so easy to follow and as its in a customer's house not really possible at all!

The effect of the fault is that the pump relay only has 11v instead of 24! But I cannot confirm the relationship between the resistor and the relay supply.

Tony