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I have a Honeywell L7224U1002 aquastat and I am unsure how to turn the temperature down. The water is 180 degrees.

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I fixed it by holding in the 3 puch buttons for 3 seconds and then I was able to lower the temp by using the up and down buttons.

Posted on Jul 24, 2008

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I have installed honeywell aquastat relay per instruction manual on my dunkirk xeb-4 lp boiler furance with honeywwell ignition unit s8610u but it wont ever start the exhaust fan checked everything several...


If aquastat wirings are ok, and control module had been set up properly, the the furnace should start.
Check if bypassing the control the furnace starts, if it starts then check aquastat wirings.
If it depends on the furnace, check the valve, the safety sensor and the ignitor.
Here is the guide to set up the Aquastat control:
Guide to Setting & Wiring Heating System Boiler Aquastat Controls

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Where do i adjust boiler temp on a gas fired boiler


difficult to say just where the temperature control is on your system. it will likely be an immersion type control located some on or near the boiler. it should have a temperature range scale on it.

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I bought a Honeywell RTH8500 thermostat and I can't get the temperature to go down past 75 degrees


You will need the installation book that came with the thermostat. There is a way to enter into the programming of the thermostat from the home screen. From there, you will need to find what code is the temperature settings in the manual, they are usually all 3 digit numbers. Once you find the code for the setting your looking for which is the lowest temp for the thermostat, it will have a 75 to the right of it which you can set a lower number. Sorry I do not have the manual right now to just tell you exactly how, but hope this still helps!

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Does the boiler thermostat control the heat of the radiators as well as the hot water temperature? Does the thermostat control the water temperature and the pump - as our pump seems to be on all the...


There should be a control called an aquastat that regulates the temperature of the boiler. The thermostat will turn on the circulator to start the flow of water through the radiators. If the water coming back from the radiators is very cold, a control will shut off the circulator until the boiler can come up to a predetermined temperature then start the flow of water again. If you have a tankless coil for domestic hot water, you now have a triple aquastat that maintains the temperature for domestic as well as the boiler temp. So yes the boiler thermostat (aquastat) does control the heat of the radiators and domestic hot water. No the pump is regulated by your house thermostat. You should take an amp draw on the boiler and componants to find out what is drawing more electricity than it should and popping your fuse.

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1 Answer

If i am away for any length of time, do i put the temp on vacation? does the water still get warm?


Since you didn't provide the brand & model of the thermostat, only generic help can be provided.

Most furnaces that run on oil or gas, make hot water all the time, 24 / 7 - winter, summer and everything between so to speak. They are controlled by an aquastat that may be set for any value between 140 - 180 degrees F. This is called "hot start" - simply because when the thermostat is set to a temperature higher than the room (turning heat ON), the water is already hot in the furnace, and is circulated immediately. If it was a "cold start", you'd have to wait for the water in the furnace to heat up from room temperature. This would substantially increase the amount of time it would take to heat the room.

Generally, the "vacation mode" simply halts the program from running. If your thermostat changes temperatures several times during the day / night, it will simply hold the lowest temperature - or a predetermined temperature built in - or chosen by you. You'll need to consult your manual to determine just how your thermostat handles the vacation mode setting. Post again if you can't find the manual - but tell us what brand and model it is.

I hop ethis helps - good luck!

Many heating thermostats don't allow for setting a temperature below 45 degrees F so freeze ups shouldn't be a problem.

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SYMPTOMS: BOILER SEEMS TO IGNITE AND FIRE UP EVEN WITH BOTH THE HEATING AND HOT WATER OFF. DO YOU THINK IT IS A BYPASS VALVE ADJUSTMENT PROBLEM? I HAVE A DU145, HOW DO I ADJUST IT? HARISH LATHIA


Some boilers must maintain temperature for proper operation. Not sure what a DU145 is?! Give us a brand name and a model number and any additional information you can such as thermostat setting, Aquastat setting (if you can) etc...

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I have a Honneywell Triple Aquasatat Relay insstalled on by boiler that heats both the baseboard and hot water for my residence. The relay is set so that the low kicks on at 180 degrees and the high kicks...


The temperatures you mention are reacting in a normal manor. The drop in temperature after it first starts comes from the water being brought back to the boiler from the system. The rise in temperature comes from the residual heat in the chamber after the burner shuts off. I would not push the limits on these settings. Water from the boiler is mainly meant as an assist . You did not answer if you have another hat water heater.

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1 Answer

I want to adjust the hi and low water temp limits for my oil hot water boiler; I have a Honeywell L7224 aquastat but I cannot find any temperature indicators; how can I do this?


To enter the adjustment mode, press the UP, DOWN, and I buttons simultaneously for three seconds. Press the I button until the feature requiring adjustment is displayed:
• HL —High Limit.
• LL— Low Limit.
• Ldf —Low Limit differential.
Then press the UP and/or DOWN buttons to move the set point to
the desired value. After 60 seconds without any button inputs, the
control will automatically return to the READ mode.

(copied from honeywell's instructions)

to clarify the differential is cut in minus the cut out.
Hope i can be some help to you.

Apr 21, 2008 | Air Conditioners

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