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Thank you so much!!! Honeywell say its discontinued they have no information for a universal replacement.I have a L8148a Aquastat relay running on a Rheem Oil fired boiler. It is time for a new thermostat, but I don't know what to buy.The problem is that the boiler never comes on to heat the water to a sufficient temperature. Try reducing the aquastat setpoint for the boiler (not the hi limit 'stat) down to 180, which should be hot enough to heat the house, and raise the set point of the hi-limit a few degrees. The basic components and connections in the circulator relay include:Some plumbers pipe in the opposite direction, that is, allowing hot water leaving the hot water tank to pass through the tankless coil for a boost that takes effect when the hot water in the separate tank is nearly used up or is cool.Observe the temperature on the gauge. Because there are three circulator pumps and circulator relays, each controlled by an individual wall thermostat, it seems unlikely that all of them are bad. I have three zone valves and only one circulator pump.Of course there may be some other issue we haven't thought-of - something that would be immediately apparent to an astute heating service technician.On 2019-05-14 by (mod) - How do you get a aquastat out of the thermal greaseWhen my oil burner is starting up I hear a loud buzzing from the boiler room.If i knew what to replace I would. Aside from more sophisticated circuit testing, you might spot this kind of trouble by simple visual inspection of electrical controls and components. The boiler is tripping on it's high limit because of lack of water flow. What should I check? The zone was not air bound. No light in the furnace. The most common cause of a high limit switch tripping is air feeding the fire, even after the fan shuts off. - Chris - Chris 5/10/12You also may have air in the lines which will have to be purged.

When the fan shuts off, your fire is raging and fires suck oxygen very powerfully. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.I have been an HVAC/R mechanic/technician for 30+ years.© 2003-2020 JustAnswer LLCI am still not getting an answer to the question I asked above. It worked fine for 2 days, then went away for 4 days and when we returned the Beckett oil burner afg was off. I have also seen in homes that set the thermostats to low, that freezing occurs in the loop, and thus, poor heat output.In my photo at above right I'm pointing to burn marks on the printed circuit board of a Honeywell L8124A aquastat on the reverse side of the overheated wire connection terminal shown above-left.my heater just don't stop heating my house i tried a new thermostat what should i try next please - Frank Carr 11/12/2012The furnace is in good shape hate to replace just because cant find aquastat. The aquastat is a device that controls the temperature of the water inside the boiler - much as a thermostat does for the air inside the house.