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Old 09-30-2010, 03:30 PM   #16
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Boiler still runs even when thermostat is off


Update to my post is as is : Today I installed a new aquastat L4080B-1253 and the problem persists The only difference is that when the boiler got to the low setting of the aquastat it shut down. Someone said that it might be the gas valve. I don't know if thats possible because we are getting gas. Any suggestions are appreciated.

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Old 09-30-2010, 04:13 PM   #17
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Boiler still runs even when thermostat is off


still something in the aquastat contacts i think. sounds like it's wired to the n.c. contacts now. did you pull parts off the new aquastat? double check your wiring.
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Old 09-30-2010, 05:36 PM   #18
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Boiler still runs even when thermostat is off


If it was wired to the NC contacts. Then it wouldn't shut off unless the stat was calling for heat.



Have you checked to see if the stats are calling for heat intermittently when they shouldn't be.
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Old 10-01-2010, 08:11 AM   #19
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Boiler still runs even when thermostat is off


How do I check to see if that's the problem? The thermostat is still not turned and the boiler is still running. It shut down when it reached the lowest setting on the aquastat. Is it possible that there is a short in the wiring coming from either one of the thermostats ? What size wire do I use if I change out the wiring? 18 gauge? Thanks again.
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Old 10-01-2010, 05:27 PM   #20
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Boiler still runs even when thermostat is off


Use your meter. And see if you have 24 volts from G to C on the relay center.
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Old 10-02-2010, 12:34 PM   #21
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Boiler still runs even when thermostat is off


I have a simple question. Do I do this with the power off to the boiler?
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Old 10-02-2010, 02:20 PM   #22
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Boiler still runs even when thermostat is off


No. The power needs to be on, to see if it has voltage across the G and C terminals.
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Old 10-03-2010, 05:14 PM   #23
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Boiler still runs even when thermostat is off


It was reading 16.8 v. I hope I did it right. I put the neg on the g and the pos on the c.When I did this I had turned on the boiler and both thermostats.When it reached 220 degrees the boiler shut down. I then shut down the lower floor thermostat.I bought 18v wire for the thermostats and will change that first thing tomorrow. I then went to turn on the heat again and just turned on the breakers. This time the boiler didn't start. I then turned on the thermostat downstairs and the boiler started and then shut off when it reached its high temp on the aquastat. I can't figure it out !!!
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Old 10-03-2010, 06:01 PM   #24
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Boiler still runs even when thermostat is off


The test is best done with the thermostats turned off, or down. So you can see if a wire is shorting and making a false call for heat.
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Old 10-05-2010, 07:43 AM   #25
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Boiler still runs even when thermostat is off


Well I have an update. The voltage was 31 with the thermostats turned off. It seems as if the Aquastat was the culprit. I ran new wire from the downstairs thermostat to the boiler and everything seems to be working fine.It turns on and off when called for by the thermostat.It has stopped running when the thermostat is turned off also. Thanks for all that replied. I have learned a lot about my boiler now. Special shout out to beenthere for you help.
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Old 10-05-2010, 02:21 PM   #26
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Boiler still runs even when thermostat is off


The thermostat wire had a short in it. Its a somewhat common occurrence.

Glad to hear you got it fixed.

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