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Old 09-28-2012, 11:16 AM   #16
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Boiler shuts off


Definately try out each zone. Too low a psi will usually show up as a circulation difficulty in the highest zone. Air locks also tend to settle in the highest zone, but not always.
Do you have radiators, base boards or in floor heating?

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Old 09-28-2012, 11:26 AM   #17
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Boiler shuts off


Jacki.. by each zone ..this is referring to all vents on all rads..start at bottom and try each vent up to top..to make sure all air is eliminated..do this after refilling with top air vents open
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Old 09-28-2012, 02:55 PM   #18
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Boiler shuts off


Spinning in the air is easy for the motor, its not doing any work. but when it tries to spin and push water it can't get up enough speed to do anything. And easy way to check it, is to take an amp draw on it when its in and the system is filled up, if its drawing its FLA or more, its not working.
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Old 09-28-2012, 04:34 PM   #19
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Boiler shuts off


Hooray! It works now! Thank you all for attending to my problem. You guys are so helpful that I wished I had joined the forum earlier at the beginning of the problem, which would have saved me a week of agony. I think what happened are the following: the pump works fine. It is less than one year old, the it spins at least for sure in the air. The gauge for water pressure is broken, but this doesn't interfere with operation of the unit. There was clearly air lock or blockage on top of the boiler. Even though I had drained the system several times, I didn't do it correctly. Water from the safety relief valve was still dirty during the last trial, and I make sure to flush it as clean as possible from both the release valve and the drain valve. There were probably some sediments in the boiler. I also drain from the second zone valve where the water was also dirty at beginning. I bled all radiators to get rid of as much air as possible. Finally, I read instructions on the relief valve, which told me to hold it open for at least 5 second while the unit is running near the highest pressure as a "try lever test". This obviously helps remove more air and get rid of debris if any, and help push water to circulate. When the boiler starts, the return pipe starts to gurgle loud right away. This is a clear indication that water is circulating. All are working well now. Thank you all again!
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Old 09-28-2012, 04:45 PM   #20
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Boiler shuts off


If you hear gurgling. then you still have air in the system.
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Old 09-28-2012, 07:01 PM   #21
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Boiler shuts off


beenthere is correct ..gurgling is from air in water ,,however, if rads and both supply and return lines are getting hot you should be OK... should have an automatic air vent at top of system so, it can automatically bleed air out over time. Otherwise air could sttle in one spot and cause another air lock preventing circulation. Glad we could help..Techpappy..Boilerman
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Old 09-28-2012, 07:20 PM   #22
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Boiler shuts off


Thanks. The gurgling noise is only obvious at the beginning and quiet down eventually. I will certainly bleed more when putting the system to work later in the winter, and there is indeed one automatic bleeder. Hope it will still work fine at that time. Thx

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