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Combi boiler - No hot tap water

  • 09-03-2017 2:09pm
    #1
    Black_Knight
    Moderators Posts: 12,397 ✭✭✭✭


    Bought a house, and have now discovered the hot taps (and hot shower) only work when the heating is turned on.

    Heating on:
    Turning on a hot tap gets hot water. Good pressure, and nice and warm.

    Heating off:
    Turning on a hot tap get cold water. Good pressure, and damn cold.

    Boiler pressure is fine (about 2 bar) and all valves (that I can see) are open.

    The boiler is set to rads and taps. If I set it to tap only and turn on the tap, nothing happens (boiler remains off). There's no warning lights on the boiler, and i've tried a reset of the boiler but nothing changed.


Comments

  • #2
    DGOBS
    Hosted Moderators Posts: 3,496 ✭✭✭DGOBS


    The combi-boiler is not wired correctly (sounds like it doesn't have a permanent live)


  • #3
    Black_Knight
    Moderators Posts: 12,397 ✭✭✭✭Black_Knight


    DGOBS wrote: »
    The combi-boiler is not wired correctly (sounds like it doesn't have a permanent live)

    Makes sense. Timer provides the live feed when on, otherwise... nothing.
    Thanks DGOBS. I've a plumber coming around tomorrow to look at the damage involved in moving the boiler, so he'll take a look at that too. Initial warning signs should have been the spare/replaced boiler motherboard chip under the boiler, and when I met the owner at the house, she was doing the washing up using the kettle.


  • #4
    bilbo_2212
    Registered Users, Registered Users 2 Posts: 10 ✭bilbo_2212


    In the process of possibly getting a Combi ( W/Bosch 30Si )....
    so keen to know of any pitfalls.
    Would a solution mean you always having to have the boiler "ON"....?
    Please post or PM me if you find the answer.


  • #5
    DGOBS
    Hosted Moderators Posts: 3,496 ✭✭✭DGOBS


    bilbo, his boiler is not installer correctly, you would not have this issue.
    Normally the boiler would come on as soon as you open a tap.


  • #6
    Black_Knight
    Moderators Posts: 12,397 ✭✭✭✭Black_Knight


    DGOBS wrote: »
    bilbo, his boiler is not installer correctly, you would not have this issue.
    Normally the boiler would come on as soon as you open a tap.

    No need to rub it in. :(


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  • #7
    bilbo_2212
    Registered Users, Registered Users 2 Posts: 10 ✭bilbo_2212


    So, am I correct in my understanding then, if installed correctly, the boiler has a dual operation....
    1) Hot tap request
    boiler comes on automatically and heats water.
    2) Seperately.... Timer switches on boiler to heat house rads, possibly controlled also by stats.


  • #8
    Black_Knight
    Moderators Posts: 12,397 ✭✭✭✭Black_Knight


    Anyone back me up on this? Is this my problem (based on what DGOBS was saying)
    Hope this image shares:
    733H-S8XseyJqNqt93By-GhchFkQMzUjqOHAeGd2o65LLtFOnt3_lRoY6VgbjGeJpF3LY6nCuyqr_CqpWxuzFSBHlh1gcSlUAO2u9t3eBLkfLeKo2SkwbIyT6-lveR0r4EAWf569wEVG660slZgbKgyYu3VdLExZ8oThxmag9X8QoqF3qI4yqnWxzSQdI1qM8I_TkLW3NvtlqM5lXi_LwvVFnuW8w792P8GxgaHRE4ivNf4NKrwtj644Q0ny-hQxgycLlvUYXjpBsaO86hEn378nkyEr6Q3jO1Ln2s6XUkOPOvvNUtJcHdQD9jNcqcwb4FPm-D34yRXCDQHGXNdRe-g_Dj_IPhi7i8oDIduNYDfpTU-3o6n4KbsufbvgpnI_7PLxOld9LrANkJdcaSWD6smzQLz1uUDrovje5KrIz268IRZQG4EK0DO0fdhYdx_ZKNpuWTn7lBp31hW64Qw63nz7Z5DkF1tHgSDp4PwUwISepgW7w-4CHlYzHB_Z5nZTm7TpgntBGmBFcNZbgNsOS63icXyAqMOyM1NJxuUdMMCmbYRHTnv5r4qhatgvPv7puWBosAzTkwFsd3wDX6sI-5mB-ooxeGbRq9BDYEf61V3Y3GJK9AI_SD_DZvgdozftWTaxU2imsSX3UvLYA-rkGJfTv4BKC22ARTyQa3IGCLM=w1200-h1598-no

    That's where the power is coming in, and I think this power flex is coming from the timer. The blank slot beside it is where the permanent power should be?


  • #9
    K.Flyer
    Registered Users, Registered Users 2 Posts: 8,565 ✭✭✭K.Flyer


    bilbo_2212 wrote: »
    So, am I correct in my understanding then, if installed correctly, the boiler has a dual operation....
    1) Hot tap request
    boiler comes on automatically and heats water.
    2) Seperately.... Timer switches on boiler to heat house rads, possibly controlled also by stats.

    Yes, that's how a combi boiler is supposed to operate.
    Black_Knight wrote: »
    Anyone back me up on this? Is this my problem...
    ...That's where the power is coming in, and I think this power flex is coming from the timer. The blank slot beside it is where the permanent power should be?

    It all depends on which model boiler and if you have separate heat zone valves as to wheter you would have a single multi core cable or two seperate cables.
    Either way, something is not right with yours.

    Edit:
    Is your boiler a Potterton or a Baxi with the time clock built into the right side of the front facia?
    Going by the picture, if I am right, the problem is most likely to do with an internal issue inside the boiler than an actual external missing wire.
    Best to get someone familiar with this model to find and rectify the problem.


  • #10
    Black_Knight
    Moderators Posts: 12,397 ✭✭✭✭Black_Knight


    It's a Baxi, but no time clock built in. We've a plumber coming out today, so hopefully he can shed some light on things.

    tQd64n5F68M-mrhzkrVXlG-oAMFoNx-uivv7HMj1exu1EZ0G2iAJDu9TKvqV2Qz4FFok0bNl03S1bb7nvkZrfp-FIhpoXePQStHEek3ufvU7T30kCTSEUOEWX-adxtZ4rH3QGf_--DtAff5tRnHKXt4_eoULAUREH0BVrg7rPzuLLPlBToeRpC4q4jWvslrj4iiAgaw32d1I4ieTeQcPZCrAU-yjtsBZh6ek_iBvlfOdVqSyfqkh6OlGc4IDG9NKq8N97Rh4ebaNZ_NZXIn0-iJf-PGx2PGmS0jfAFIQchlYaRhdOX5t7u5JTUwYepAvyQQTokDHYK0KoFAd_0vt9TWhAotKg-QgWu_oiRcWGQqqaGLIJ5lQDNtWfCjAir5exUPtlZdIwJqR5X5bTrPqxSLFX3YJdrFM8nNLDtJE9EgcnAhoVL0oQu9I8iPPGGFoYmqUFak4DzSd7V6WlH9sS4hCG44ta3FaAJzPYab7W8nEdRwD5Z6RVPxPhSbzmOmxBKrkLPy34X1IQuNALVS-ZW34gPHVY0urXtNqtntW8LXcCV8N5bqcwX7XVHw3ZhWT7-du3S0dKItYN_BOU0ut7KXBKgldTD1CLjUB-WsHEUkZSKPTF3Ez8A=w900-h1598-no


  • #11
    K.Flyer
    Registered Users, Registered Users 2 Posts: 8,565 ✭✭✭K.Flyer


    Ahh no time clock, ok, he needs to check for perm live so.
    With the left selector in the position that you have it in, you should have one of the front panel lights on even with the heating timer off.


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  • #12
    Black_Knight
    Moderators Posts: 12,397 ✭✭✭✭Black_Knight


    K.Flyer wrote: »
    Ahh no time clock, ok, he needs to check for perm live so.
    With the left selector in the position that you have it in, you should have one of the front panel lights on even with the heating timer off.

    Cool. Thanks man! I'll see what he says and run it by him. Eventually that boiler (and the wallpaper behind it :eek:) will be moving. Could even be replacing the boiler while we do it.


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