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Old 01-15-2009, 10:47 PM   #1
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Oil furnace does not fire up


I have 10 year old Rheem oil furnace. My oil tank (I think it is 250 gallons) is 25% full. Two days back the furnace stopped blowing hot air. It looked like the blower in the furnace was working but the furnace was not ignited. So there was only cold air blowing from all the vents.

I called the technician and he replaced something (probable nozzle). Then the furnace worked fine during evening hours but then again next day morning it stopped working. So I called the same technician again, he came and checked the furnace. He pressed the trip button and restarted the furnace. It fired up this time and it started blowing hot air. After checking few things he said that the oil temperature was very low and so furnace did not ignite. the temperature on Oil tank was 29 degree F. He checked the wall temperature and it was 22 degree and around the oil pipe (leading to furnace) it was around 27 or 29.

Now after few hours of furnace working it is again blowing only cold air (in between it went through couple of cycles of on/off based on temperature setting).

So is it true that at 29 or probably 27 degrees the oil becomes thick and so oil furnace won't fire up? It is likely that during night hours the temperature around the oil tank might be lower then 29 degrees.

Please help.



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Old 01-16-2009, 03:00 AM   #2
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my furnace will not prime


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Old 01-16-2009, 06:18 AM   #3
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At 27, the oil will burn just fine.
A lot of people have their oil tanks outside, and the temp is 15 and working just fine.
There is also an additive that can be put in the oil, to keep it flowing at temps below 0F.

Call him back, he missed something on the 2 previous calls.
If it was too cold for the oil, then when he was there, he wouldn't have been able to get it to flow or burn.

Could, also be the new nozzle he installed, is not good.
But, it could also be one of the following.
Incorrect ignitor setting.
Weak ignition transformer.
Improper combustion air setting.
Restricted/clogging oil filter.
Incorrect nozzle was installed by accident.
Dirty/weak cad cell.
Primary control going bad.
Loose wire connection.
Carbon build up at the air cone head.
Weak oil pump.
Dirty oil pump strainer.
Clogging oil line.
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Old 01-16-2009, 11:03 PM   #4
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It was transformer. I got transformer replaced and furnace is working now.

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Old 01-17-2009, 03:38 AM   #5
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I'm guessing that when you say transformer it was the high voltage ignition transformer, but that is not my question. I'm curious about how old of a system do you have that allows the blower to run without heat?
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Old 01-17-2009, 07:06 AM   #6
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I think you are correct. I is high voltage ignition transformer. I don't know the exact technical name.

Anyways, my furnace is 10 years old (1998 Rheem High Efficiency furnace).



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fire up , oil furnace

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