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Boiler heating water in cylinder but not radiators

  • 19-09-2016 9:27pm
    #1
    Lightning Jack
    Registered Users, Registered Users 2 Posts: 12 ✭


    I recently fired up my oil boiler for the first time this since earlier in the year. It has no problem heating the water in the hotpress upstairs but none of the radiators are heating up. If the water is being heated in the cylinder, I'd imagine that the pump is working ok, is there any reason as to why the radiators might not be heating at all?


Comments

  • #2
    ted1
    Registered Users, Registered Users 2 Posts: 23,902 ✭✭✭✭ted1


    Have you bleed them? Are any if the pipes entering the rads warm ? Is there valve that isolates the cylinder and rads ?


  • #3
    johnayo
    Registered Users, Registered Users 2 Posts: 1,718 ✭✭✭johnayo


    Is there a valve for isolating the rads and heating the the tank only. There is on my system although mine is gas.


  • #4
    Robbie.G
    Registered Users, Registered Users 2 Posts: 1,884 ✭✭✭Robbie.G


    Look for a thermostat fitted on a wall and make sure it's turned up past 25 degrees


  • #5
    Lightning Jack
    Registered Users, Registered Users 2 Posts: 12 ✭Lightning Jack


    ted1 wrote: »
    Have you bleed them? Are any if the pipes entering the rads warm ? Is there valve that isolates the cylinder and rads ?

    I have bled them. Some of the downstairs rads get warm at the top. There is a valve in the hot press alright


  • #6
    cupan_tae
    Registered Users, Registered Users 2 Posts: 126 ✭✭cupan_tae


    ted1 wrote: »
    Is there valve that isolates the cylinder and rads ?

    Didnt see an answer to this?

    And are all valves definitely open ?


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  • #7
    jod100
    Registered Users, Registered Users 2 Posts: 1 ✭jod100


    Circulating Pump is probably stuck after being idle for a few months. Perhaps a light tap of a hammer might release it ... has work for me a few times.

    If the cylinder is positioned above the boiler it might still heat without the circulating pump ... note that water can usually pass through the pump even if it is not running for example if there is a gravitational pull due to a difference in the temperature of the water bottom to top.


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