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The unit is an apollo 50SI. PCB has been changed twice. Pilot light comes on and then ignition switches off but is trying to ignite. the ignition is clicking but burners not coming on as burner is on but not firing up completely. Does that help me ?

Thanks for your help guys. What is an RGI and why was system working until now. Also it seems when i turn on hot water boiler is working. Only when heatign system is turned on wont work

Can someone help. I have an apollo 50 si boiler. the PCB and electrode lead have been changed twice over 6 months. The pilot is playing up again. It shuts off after about 5 minutes. When the PCB and electrode were changed in Feb 09 it has been working until now. What could be the problem ...