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Old 01-02-2008, 09:33 AM   #1
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hot water boiler system - circulator not running


circulator motor not running. I have a Honeywell L8148A Aquastat

I checked voltage at C1/C2 on Aquastat (circulator feed) and didn't register anything, so it appears the circulator is not getting any power.

Could this indicate a dirty relay? If so would cleaning it be a good idea?

Any tips appreciated, we are cold Thanks,
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Old 01-02-2008, 10:24 AM   #2
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hot water boiler system - circulator not running


You Do have the T-Stat turned Up high enough to call for heat,.... Right,.??
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Old 01-02-2008, 02:02 PM   #3
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hot water boiler system - circulator not running


Yup. Turned it way up to like 28... boiler started up but nothing happening with the circulator. On a lark I decided to hardwire the circulator, bypassing the aquastat, and it immediately kicked in and started circulating heat. After about 15 minutes the whole house was starting to get toasty again.

So it seems like the circulator itself is alright, the thermostat seems to work fine. Seems like a faulty aquastat to me. Anyone concur?
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Old 01-02-2008, 06:32 PM   #4
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hot water boiler system - circulator not running


your aquastat limits the ciculator and the stat runs the gas side on a call for heat..do you have a hi-limit forbthe boiler also with temperature dial to set the burner limit to cycle off when reached...sensing the water in the boiler 160F-180F typical.with your ohm meter and the wires off the aquastat turn the dial full cw then ccw on it if you have one to see if it opens or closes.
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Old 01-05-2008, 12:27 PM   #5
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hot water boiler system - circulator not running


I suspect by now you've fixed your boiler by either cleaning all your pertinant electrical connections or replacing your aquastat. Please let us know how it played out. Thanks Cliff
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Old 01-05-2008, 12:31 PM   #6
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hot water boiler system - circulator not running


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Originally Posted by UBoiler View Post
I suspect by now you've fixed your boiler by either cleaning all your pertinant electrical connections or replacing your aquastat. Please let us know how it played out. Thanks Cliff
Actually I just hard-wired the circulator and now it is running continuously. In my case it works better actually since it is now more evenly distributing the heat.

Uses more power though, but this will allow me to defer actually replacing the aquastat until the end of the heating season essentially...

Cheers,

-jordan.
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Old 01-05-2008, 09:11 PM   #7
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hot water boiler system - circulator not running


The old IBR used to reccommend constant circulation for comfort. The ideal set up was to control the pump by outdoor temp. and the thermostat controlled the burner.
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Old 01-06-2008, 07:55 AM   #8
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hot water boiler system - circulator not running


you mght want to re-think the fix in the spring and have the stat run the circulator(add 24v NO relay)...and let the aquastat run the gas to maintain the water temp.this way if the stat is satisfied th circ, is off so the aquastat doesn't Maintain the water in the boiler.
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