BAC Forum
General Boards => Technical Support => Topic started by: Brian Buchanan on January 22, 2024, 11:44:25 PM
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Hoping for some assistance with a older Hurricane system, CO45DRF model.
This hydronic heating system has an issue refiring after it has cycled off of the aqua stat switch, here is the symptoms.
On initial start up the boiler fires as designed, and the boiler burns until it comes to temperature, and as designed the aqua stat switch shuts the burner off until the boiler temperature returns to the refire stage. It is at this point that the burner attempts to refire, but after failing to refire the third attempt it sets the "flame out" system code. I have tried a number of things to restart the burner at that stage with no luck.
Upon trying to diagnose the unit I have found that the igniter is glowing, the air compressor sounds to be running, which leads me to believe that the issue is fuel related either the fuel pump or the fuel regulator.
After the boiler cools down (15 - 30 minutes) the burner will refire and operated till the aqua stat switch shuts it down again, but will still not refire.
In the recent past I have replaced the aqua stat switch, the high temp limit switch, the air fan, fuel filter, a number of rubber fuel lines, the nozzle and have purged the fuel system. I have also repaired an electrical (brush) issue in the air compressor motor and now have run out of ideas ... just looking for some guidance from someone that may have fought this battle.
1998 Patriot Thunder
40' Brandywine
C12 CAT
Thank you
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Brian,
Just a WAG but have you checked the flame sensor? If it is failing due to temperature (always sensing a flame in the burner once it heats up) it would not allow the burner to restart until the sensor cools down.
Steve
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I actually had not thought of that, I will look into that tomorrow. WAG is what I'm looking for at this point
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Brian,
As Steve mentioned, there is a haze that will build up on that photo cell and cause that. Also look at the insulation around the glow plug and make sure the hair clip has not torn thru it when you reinstalled it. Fred
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Thanks Fred, The hair clip seems to be fine on the igniter, and if memory serves me correct the indicator lamp on the eye, usually flickers as the eye reads the flame. I will check this morning but I'm still leaning toward the fuel regulator for the same heat related idea. I will let everyone know when I get to the bottom of the issue.
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Brian
This is not likely your issue but while your working on the unit it's a good idea to clean the combustion chamber and exhaust pipe the exhaust has a bad habit of getting plugged with rust flakes creating a combustion air flow issue and rich operation causing the combustion chamber to soot up quickly which can also create issues with the flame sensor .
Eric