Hello. I'm new to this forum and I have a new question relating to this boiler. I'm not sure if this the right place to pose it -- so:
I bought one second hand about 5 years ago and serviced and installed it myself. I have replaced various bits including the oil pump and the jet.
It has been very reliable but recently it has been running intermittantly -
When the system is up to temperature, the combustion will burn for about 30 secs. quite happily, - then stop for 5 secs, then reignite etc. It seems to work fine for the initial (long) heat-up. I have a pressure guage fitted on the burner and I have the pressure set to 110 - it stays quite steady. The air setting is at about 7 - a bit high according to the books but I adjusted it to a point where there was no smoke etc. I have cleaned the optical sensor but I haven't recently done a complete service.  I've tried setting the thermostat higher etc. but Im sure this isn't the problem because the blower keeps going. If the problem caused it to shut down or lock out it wouldn't be quite so mysterious -- any ideas??
Thanks.