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Anonymous Posted on Oct 11, 2017

Aquastat relay yesterday came home my house was cold radiator cold and notice that the system in the thermostat was on. when to the boiler room and notice that the circulator pump was on and the boiler was off. i click on the aquastat relay switch like 5 time and the boiler when on. i want to know if is time to change the aquastat or can there be another problem?

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Mike Squire

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  • Master 420 Answers
  • Posted on Oct 12, 2017
Mike Squire
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Joined: May 14, 2009
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It may be, the best way to check a line voltage thermostat like the aqua stat is take a multi-meter on AC volts (120), when the thermostat is or should be demanding heat put the meter across the screws, if you read more than 20-30 volts for certain the stat is worn out. A functioning aqua stat when checking across the terminals should read but a few volts whether the system is 120 or 24 volts, on low voltage it's even more critical to limit voltage drop through a set of contacts.

5 Related Answers

A

Anonymous

  • Posted on Jul 12, 2008

SOURCE: Hi! I have a problem

you may have many probs... 1 a poir boiler combustion. (not boiling the water) or just warming it up so it's not hot...that would mean your temperature sensor is broken or you have probs with the actual combustion process.. This could be an unsafe situation ..i would call a heating specialist right away.

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Anonymous

  • 308 Answers
  • Posted on Jul 09, 2009

SOURCE: thermostat problem ?

If you start by looking on your gas valve, you should find the correct amperage to set the heat anticipator at. I am not sure if you have a forced hot water system or a steam system, but depending on the case, you may also have a second problem, which is easily addressed. If you have forced hot water, the upstairs baseboard/radiators may be airbound and need to be bleed. If you have steam, you may need to slow down the downstairs valves, and open the upstairs valves to get a balance. Hope this helps

Anonymous

  • 1420 Answers
  • Posted on Feb 15, 2010

SOURCE: I have a boiler system that was turned off at the

Take off the thermostat and jump the red and white wires together. The boiler should fire up. If not, you will need to check if the boiler has power to the control. It could be a fuse that burnt.

Paul Carew

  • 3808 Answers
  • Posted on Feb 27, 2010

SOURCE: gas boiler problem on restart. new themocouple new

Hi sounds lke thermostat problem adjust anticpator arn on thernmostat see if that helps

Testimonial: "yea it went beyond thermostat to the aqua stat relay good starting point had profeesional sevice call "

Anonymous

  • 455 Answers
  • Posted on Sep 08, 2010

SOURCE: Old system has a 6006

Hello The easy way to bring the blower on for heating is if the thermostat has an ELECTRIC heat function or selector switch.That will bring on FAN during a call for heat.The aquastat won't be used.

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My Gas Boiler Aquastat Relay Switch Is Malfunctioning

have it replace immediately. bypassing safety feature is a bad idea. Your life, hour home will you have insurance after bypassing safety feature very doubtful. have it replaced.
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We have a W. McLain CG, small house, just 1 zone so no zone valve. How do I get the pressure back up, it is too low and heat is not reaching the back room

Boilers are set at 180 degrees which gives between 550 and 600 degrees per foot of baseboard depending on the brand. You can change the aquastat setting to 200 degrees which will give more heat, but that may not be your problem. Your system may not be balanced properly. If there is too much baseboard(BB) near the thermostat, it may shut down the boiler before it is warm in the back room. You can close the dampers near where the stat is, and fully open the dampers in the cold room. There is also the possibility that you need to purge some air from the system.
The best solution would be to split off with another zone if none of this works. I'm assuming you have a CG-3, but what size is your house? Is there an indirect fired water heater that uses the boiler to heat domestic water? If you have a cg-3 and your house is over 1000 sq feet, then your boiler is undersized. Good luck!
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It sounds like your thermostat could be the problem. Have you noticed the boiler cutting off at all, or does it run continuously until it goes out on low water?

You stated, "when boiler is on", so I am wondering how you get the boiler on. If your boiler is controlled by a thermostat, you need to check it for a cold draft possibly from behind the thermostat in the wall where the wires come through. The thermostat should never be on an outside wall. The thermostat could be defective.

An aquastat can also control your boiler. If you have an aquastat, check the setting, typically 175 - 180 degrees. You should also have a "high limit" which should be set at 210 - 220. Some people run that high side limit higher; not a good idea - defeats the purpose. If the aquastat is set too high, the boiler will operate too hot and the problem you have will occur.

"pressure rises and pressure relief valve opens" This could mean that your pressure switch is prematurely venting. Check boiler temperature to see exactly at what temperature the T&P valve purges. If it blows off below the high side setting, either adjust or replace. The T&P valves are usually not adjustable. That blow off temperature is stamped on the head of the valve. So, if it discharges too soon, replace it.

Have you actually seen evidence thgat the T&P valve is opening? You may have a bad bladder in your expansion tank and your system may have air in it. Your boiler should have 12 psi when cold and 20 - 22 psi when operating. Check your boiler pressure guage.

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this eventually drops below the minimum operating pressure" Technically, there is set point for a NO MINIMUM OPERATING PRESSURE. That is a function of the amount of water in the boiler. If the T&P is blowing off, it will vent water from the boiler and the boiler pressure will go down. There is a minimum operating TEMPERATURE.

Your boiler could be low on water. You will have to manually fill the boiler. Be careful of thermal shock to the boiler. Feel the piping, and fill only when the circulator is running. Make sure the water is not going directly into the boiler. The supply water should go into the circulating supply side which feeds the radiators, radiant floor, or base board circuits.

All this will adversely affect your hot water. The heat exchanger for the potable hot water may have scale build up in it. Using the hot water keeps the boiler running, and a scaled heat exchanger will give you cooler hot water and the boiler keeps running. If this is a problem, you will need to replace the heat exchanger. A better idea is to not use the boiler for your domestic hot water. Why run the boiler in the summer?
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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...

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Hello The easy way to bring the blower on for heating is if the thermostat has an ELECTRIC heat function or selector switch.That will bring on FAN during a call for heat.The aquastat won't be used.
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You may have either a bad thermostat, shorted wire to the thermostat, a stuck relay or a bad gas valve. You will need to test the thermostat using a multimeter to make sure it is working correctly. If that is good, start checking the aquastat relay.
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the problem there a relay stuck or thermostat bring on the pump & you can lower your high limit aquastat!! also the flow valves can bypass hot hot water risers time to put in a seperate water heater domestic coil are not energy efficient !!!! aquastat high limit set @ 180f deg low limit set @ 140f deg!!!
good luck!!! tim
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