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Old 12-18-2011, 05:37 PM   #16
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My oil burner is short cycling


the oil pump pups all the time the burner runs so Yes there is some pressure within the nozzle and residue dripping within the burner chamber waiting on the next refire.the relays sound like they are weak or the actual transformer(TR) is weak...you didn't add a new stat that is led lit or digital....that would pull on the unit mounted TR and cause the relays to drop out or chatter...try the jumps especially down on the furnace there combo of oil rumbling and relays dropping ..what is the temperature setting for the boiler during a heating cycle.

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Old 12-18-2011, 06:05 PM   #17
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My oil burner is short cycling


Look you could replace everything on your boiler and you would still have the same problem.Why you ask???? Its because an oil burner has to be set up with instraments.Setting a burner by eye might have been ok 20 years ago when fuel was cheap ,but not doing it by instraments today could cost you $400 or more in one heating season.
Also by not listing the make ,model number and serial of your boiler leaves the rest of us in the dark without a chance of being able to help you just get by.
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Old 12-18-2011, 06:07 PM   #18
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My oil burner is short cycling


It is the original stat I jumped it out at the boiler still having same results my high is set on 180 and low is set for 160 with a 10 degree differential I've noticed when it starts rumbling the flew starts opening and closing it seems like it is getting a lack of fuel I am stumped I am gonna replace the aquastat tomorrow and see If this helps I may need to hire a heater guy to hook up his tool and see what is going on with it
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Old 12-18-2011, 06:10 PM   #19
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My oil burner is short cycling


It is a thermotron II cwl-85 boiler and a carlin Ez-1 burner I know it needs to be setup but it is a Sunday and I would like to put it off tomorrow if I could avoid the emergency service call...
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Old 12-18-2011, 06:17 PM   #20
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My oil burner is short cycling


Is there a way to jump out my aquastat to see if this is the problem?
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Old 12-18-2011, 06:39 PM   #21
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My oil burner is short cycling


Not knowing for sure,but it sure sounds like you are burning extra fuel in the combustion chamber.This means you probably have a leaking nozzle or the electrodes are not starting the flame right away.That could be a weak transformer,or a cracked porcelin or dirty contacts ,.Therev is just a lot of things it could be.I wouldn't even think it was the aquastat or thermostst but who knows without being there.
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Old 12-18-2011, 07:22 PM   #22
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My oil burner is short cycling


I agree with you, you would definitely need to hear it running it will run a good cycle then it's off for about 20 minutes then starts up for 30 seconds then boggs down and out stays off for about 15 seconds and does the same thing... This usually goes on for about an hour till it gets up to temperature it is not throwing the red switch which is leading me to believe it's not a burner problem it's an electric problem I just turned it off for the night and I think I am going to get someone out to look at it tomorrow I will post and let you guys know the outcome
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Old 12-30-2011, 12:20 PM   #23
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My oil burner is short cycling


I had a hvac guy come out my aquastat was fine we replaced the pump transformer and primary control and it runs great he told me the transformer was bad put a honeywell primary on it and replaced the pump because we don't know the last time it was replaced but all is well now

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