Residential Commerical IndustrialIt sounds like the aqua stat is working as limit, and it is shutting down the boiler.Did you bleed the air form the sytem after you repalced the pump?Hi Ron Im A homeowner Trying to Fix This Problem So Bear With me On Some OF your Questions .I have a UTICA BOILER 6YRs.OLD YESTERDAY WHEN I CAME HOME I REALIZED I HAD A PROBLEM SO I WENT DOWN TO CHECK AND FOUND THAT THE BOILER SHUT DOWN BECAUSE THE WATER TEMP> WAS AT 200.AT FIRST I THOUGHT IT MIGHT HAVE BEEN THE CIRC. His boiler is 45 years old and we got a quote today of $8,000 to replace it.He is 67 and on Medicaid doesnât qualify for Social Security. SOME (not all) models of cast iron boilers that are assembled with cast push-nipples between boiler sections can leak when they cool down completely.If your hot water usage volume is very small and/or if you don't have a mixing valve to avoid scalding, you can set the LO to a still lower number if you prefer.Turning off the heating boiler in order to save money during most of the day when you are not using hot water, sounds appealing.A much debated question is just where is the break-even point between the standby losses from keeping the boiler warm, versus the extra fuel you have to burn to heat up an ice cold boiler when you need hot water from the tankless coil.Let me know if the article leaves you confounded or if you have further questions.And everyone felt smug about saving on heating cost. How to use the reset button: press it once? Details about this case are nowClarification: Turn down the t-stats to the two other loops (that are working) so that all heat goes to the troubled loop that you have activated (via t-stat for troubled loop).If voltage is everywhere it should be and a relay is clicking constantly OR a transformer is buzzing, those component(s) are probably bad.Your aquastat, the L8024B controller, also sold in the L8024D model, is being used in your case to control a Hydro-Therm natural gas-fired heater and possibly a circulator pump; often a review of exactly how a controller is being used in a given application can make more clear just what replacement aquastat will work best.I have a Gas Hydrotherm 86000 Model R108 furnace. eco thermostat. Then when the room thermostat indicates that finally three or four hours later that it needs more heat the furnace comes on and when the temperature gets high enough the pump comes on and stays on till the temperature inside the furnace is low enough to turn it off.The HI will actually be irrelevant in your as you're never calling for heat - just leave it alone so that if you're away from home and the boiler needs to kick in to prevent pipe freezing, the settings will be at their normal position.Easier might be to keep an eye on the total boiler run time under the two circumstances: left on and an occasional intermittent burn cycle versus left off and a longer heat-up cycle.
attached is all I have on unit.If there is no call for heat but the boiler cycles on, I'd expect that ON cycle to be driven by the LO and DIFF controls just as you describe.Also check for a bad relay in the control. To shut the boiler down for 23 hours each day? What might be reason please?If you are looking for the main reset button on heating equipment you'll want to see2. Heating aquastat repair: guide to diagnostic troubleshooting for heating boiler aquastat controls: this article describes common operating problems with heating system aquastat controls and how these troubles are diagnosed and fixed.