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Thanks ALanE. I did some investigation and if you read my first post, the replacement PCB did cure the major problem (i.e. Reset light on all the time, nothing worked). The only thing confusing me now is the central heating being too hot. I could get a thermometer and check the temp of the CH...

I've tried using the multimeter but am unsure of the results. I connected it to either end of each of the leads going to the CH temp sensor in turn and got readings fluctuating from 100 - 300 with the multimeter set to 2000 ohms. I then tried this on the leads going to the hot water temp sensor...

Thanks Weargas, I'll try this. I don't have a multimeter myself but I am borrowing a friend's tomorrow so I'll see how this goes. I guess if I get resistance on the leads I'll need to change them somehow.

Right, I've tried turning both of the temp dials on the front of the boiler to minimum but the CH still doesn't modulate the burner. I've read my boiler manual and it refers to a "motorised three way valve" which I am assuming is a diverter and it only has three wires. I assume (I assume a lot...

Thanks, I'll have a go at this and let you know.

I've tried something else today. I short circuited the CH temp sensor to see what would happen. When I did this, the PCB correctly detected that the temp was too high and switched the flame down to minimum, followed moments later by the flame being extinguished but the pump still circulating so...

Hi All! I've been reading the forum for a while now and find it great but this is my first post. I'd like to thank everyone in advance for any help given. I have a Potterton Lynx 2 Combi boiler which is about 11 years old. Last week it just started showing the reset light all the time. I...