Potterton Lynx 2 DHW problem

Joined
17 May 2004
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United Kingdom
I have just changed my PCB on my Lynx 2 because of blown relays and to hopefully fix a reset problem i was having.
The CH side of things seem to run fine.
The DHW side of the boiler causes all the problems.
If i turn on the hot water the boiler opperates as it should do: Demand,ignition, flame and the water heating lights all come on in the correct order.
After 2 mins or so the flame light goes out the ignition light comes on to try to relight it and eventually the reset light comes on.
There is a spark from the electode, but it does not relight.
If i reset the boiler everything works and then it goes through the same process.
Does anyone know the fault?
 
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Found it to be a faulty DHW sensor.
Boiler was overheating and locking out.
 

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