Ask Experts Questions for FREE Help !
Ask
    tx2931's Avatar
    tx2931 Posts: 5, Reputation: 1
    New Member
    		  
    #1

    Oct 25, 2006, 05:23 AM
    Boiler radiators always HOT
    Should my boiler (hot water system) cycle on (burners fire and refire) when my THERMOSTAT is set in the OFF position? These are my symptoms:1,THE RADIATORS STAY HOT WHEN THERMOSTAT IS IN OFF POSITION! 2, LOUD BANGING NOISES IN PIPES. The only way I stop these symptoms is to shut off the entire system at the main switch. It just seems to me that the BURNERS should stay off until the thermostat is switch ON and calls for heat! It has a L8124A aquastat and AT72D transformer both by honeywell

    AL

    [email protected]

    :confused:
    Airwren's Avatar
    Airwren Posts: 15, Reputation: 2
    New Member
    		  
    #2

    Nov 7, 2006, 05:47 AM
    No a boiler should shut off when there is no call for heat, unless it is wired incorrectly. If there is banging, it could be a restricted boiler, low flow, dead recirc pump etc. Need more info on type of boiler install, maybe pictures could help
    tx2931's Avatar
    tx2931 Posts: 5, Reputation: 1
    New Member
    		  
    #3

    Nov 9, 2006, 09:39 AM
    Looks like the aquastat (L8124A) has a high and LOW SETTING. Its seems like the LOW setting is designed to keep the water temp at the LOW setting temp no matter what the thermostat is set to! Similar to a hot water tank. DOES THIS SOUND PLAUSIBLE?

    AL
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #4

    Nov 9, 2006, 10:58 AM
    Check the sticky at the top of the forum and see if your thermostat follows the same wire colors. Also, gas or electric? Do you have zone valves closing off different sections of the house. To get heat to a radiator, the thermostat needs to activate the burners, start the pump, and open any zone valve. Everything is controlled by relays which can stick. If a zone valve sticks open, it may continue to call for the pump and burner to be on. Look over your system and get back to us with more info.
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #5

    Nov 9, 2006, 04:48 PM
    Sometimes, boilers are hooked up this way. It was a popular way in the 1950's to late 60's. They called it something like, heat ready, an older timer than me would remember. The thinking was the core would stay hot, the burner ran on limit, and when the thermostat came on, it only turned on the pump. Often these where changed over to other configurations because of the perculation noises. Also if you didn't turn off the wall switch it would stay hot all summer or when not needed.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Old radiators + new boiler are boiling us alive [ 6 Answers ]

Help! We recently installed a new boiler and pump in our 77-year-old home. The water pressure is great, but too much for our old boilers. They are incredibly hot and can't be turned off. Our plumber has been searching for new valves to fit to the old radiators, but without luck. Any ideas?

Replacing Hot Water Radiators with Hot Water Baseboards [ 2 Answers ]

I have a hot water heating system with radiators, and I want to replace the radiators in the upstairs bathroom and bedrooms (2) with hot water baseboards. Can radiators and baseboards be mixed and if so, how do I determine the size of the baseboards?

Hot radiators but no hot water [ 6 Answers ]

Hi there I hope someone can help me. I have a problem with my hot water, the heating is on and the radiators are roasting hot but I have no hot water if someone could help I would really appreciate it. Thanks Jennifer

Warm radiators when the heating is off, and hot water is on [ 0 Answers ]

Please Help, Does anyone know what the problem is with my central heating system. The radiators in the house are warm, but I have not been calling for central heating, only water. Radiators are warm both upstairs and down. I have a gas fired boiler down stairs in the kitchen and hot water...

Radiators heat when only Hot water on [ 3 Answers ]

I have a newly installed Mains Pressure Hot Water Cylinder. When I turn on the hot water only; after about 15 minutes some radiators begin to heat. The plumber says this is backwash and I should turn the hot water off after 15 minures to solve the problem. I think in a new, modern system,...

View more questions Search