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ajlboarder 11-11-2011 04:15 PM

Boiler issue
 
My boiler system will start up just fine and heat the room as it should. Problem is that once the thermostat reads that the setpoint temperature and ambient are the same, it shuts the pilot light off. After ambient drops below the setpoint temperature the system won't light the pilot which obviously won't light the main burners. However, if I turn the boiler power off and then turn it back on(manually with a switch), it will fire right up and do exactly what its supposed to do. Any help would be great.

Edit: If helpful, its a Weil-McClain HE-3, Series 2

carmon 11-11-2011 04:37 PM

Quote:

Originally Posted by ajlboarder (Post 768790)
My boiler system will start up just fine and heat the room as it should. Problem is that once the thermostat reads that the setpoint temperature and ambient are the same, it shuts the pilot light off. After ambient drops below the setpoint temperature the system won't light the pilot which obviously won't light the main burners. However, if I turn the boiler power off and then turn it back on(manually with a switch), it will fire right up and do exactly what its supposed to do. Any help would be great.

Edit: If helpful, its a Weil-McClain HE-3, Series 2

boiler is locking out for some reason. you are re-setting it when you turn the power on and off ,,,,,,

ajlboarder 11-11-2011 04:59 PM

I think the relay on the pressure switch is defective... it kicked on when I put a jumper across

beenthere 11-11-2011 06:59 PM

Or you have an obstruction in your flue, or moisture in the hose, a crack in the hose, A restriction in the boiler.

carmon 11-11-2011 07:53 PM

Quote:

Originally Posted by beenthere (Post 768943)
Or you have an obstruction in your flue, or moisture in the hose, a crack in the hose, A restriction in the boiler.

i concure could be many things:eek:

ajlboarder 11-13-2011 10:57 AM

Quote:

Originally Posted by beenthere (Post 768943)
Or you have an obstruction in your flue, or moisture in the hose, a crack in the hose, A restriction in the boiler.

If any of these were the case, why does it work properly on start-up? Seems like some component based defect to me..

beenthere 11-13-2011 01:34 PM

Quote:

Originally Posted by ajlboarder (Post 770193)
If any of these were the case, why does it work properly on start-up? Seems like some component based defect to me..

Because its a partial obstruction. And gets worse as the unit runs. then when the unit shuts off, the obstruction is still causing the problem. Its probably not satisfying the thermostat completely, and is locking near the end of the heat call.

ajlboarder 11-13-2011 04:14 PM

I can drop the setpoint manually to satisfy and the problem still exists even after only 1 minute of running.

ajlboarder 11-13-2011 04:22 PM

I have also noticed the following:
If thermostat is on and set to higher than ambient before boiler is turned on -> system works fine
If boiler is on before thermostat is set to "heat" -> system has the same problem (blower kicks on but wont light pilot)

beenthere 11-13-2011 05:34 PM

probably needs a good cleaning and service.

how 11-13-2011 06:22 PM

If you bypass the thermostat leads and fire it through a heating cycle, does it still lock out?


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