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  • FIRST POST
    • Rock_007
    • By Rock_007 13th Mar 17, 2:54 PM
    • 29Posts
    • 14Thanks
    Rock_007
    Heating working but NO hot water and no ignition(fire) stop when uses hot water tap
    • #1
    • 13th Mar 17, 2:54 PM
    Heating working but NO hot water and no ignition(fire) stop when uses hot water tap 13th Mar 17 at 2:54 PM
    The central heating(Potterton) is working fine, but no hot water (it does comes and go a bit hot water though).
    We we put heating on i can see the flames in the boiler and it is working fine but as soon as i run the hot water tap, the ignition flames stops and no hot water.

    I have checked the diverted vales , when i run the hot water tap i can see the Pushrod comes out and touches the Microswitch as well.

    I have read some forums and though maybe this is due to heat exchange plate sluggish but not sure.

    Any advise really appreciated.
Page 1
    • Alex1983
    • By Alex1983 13th Mar 17, 3:06 PM
    • 316 Posts
    • 166 Thanks
    Alex1983
    • #2
    • 13th Mar 17, 3:06 PM
    • #2
    • 13th Mar 17, 3:06 PM
    Not likely to be the heat exchanger if the boiler doesn't fire.
    What boiler is it
    • bertiewhite
    • By bertiewhite 13th Mar 17, 3:13 PM
    • 425 Posts
    • 406 Thanks
    bertiewhite
    • #3
    • 13th Mar 17, 3:13 PM
    • #3
    • 13th Mar 17, 3:13 PM
    Are there any fault codes?

    I'm wondering if there is an overtemp sensor in the DHW circuit or if running the HW is causing an under pressure issue?
    • Rock_007
    • By Rock_007 15th Mar 17, 5:49 PM
    • 29 Posts
    • 14 Thanks
    Rock_007
    • #4
    • 15th Mar 17, 5:49 PM
    • #4
    • 15th Mar 17, 5:49 PM
    Not sure about the fault code, but the following appears when the boiler is running,

    1) when i put the heating on the boiler start working and i can see in temperature rises and can see the flames.
    2) As soon as i run the hot tap on the flame goes off and temperature start dropping and in the end i left with only 30degree light on and the water comes a bit hot and then cold.
    3) as soon as i stop the hot tap the flame against light up and the temperature starts increasing.

    The model of the boiler is Performa 28 - Potterton
    • Rock_007
    • By Rock_007 15th Mar 17, 5:51 PM
    • 29 Posts
    • 14 Thanks
    Rock_007
    • #5
    • 15th Mar 17, 5:51 PM
    • #5
    • 15th Mar 17, 5:51 PM
    just to mention the pressure is dropping a lot with in a day and i have to again top up just after one day now.
    • Alex1983
    • By Alex1983 15th Mar 17, 6:05 PM
    • 316 Posts
    • 166 Thanks
    Alex1983
    • #6
    • 15th Mar 17, 6:05 PM
    • #6
    • 15th Mar 17, 6:05 PM
    Does the hw led light
    • Rock_007
    • By Rock_007 15th Mar 17, 6:53 PM
    • 29 Posts
    • 14 Thanks
    Rock_007
    • #7
    • 15th Mar 17, 6:53 PM
    • #7
    • 15th Mar 17, 6:53 PM
    1) when hot water tap is open, the tap led does go green but the flame LED remains off
    2) when heating is on, the heater led go green and the flame LED lit as well
    • Alex1983
    • By Alex1983 15th Mar 17, 7:06 PM
    • 316 Posts
    • 166 Thanks
    Alex1983
    • #8
    • 15th Mar 17, 7:06 PM
    • #8
    • 15th Mar 17, 7:06 PM
    Without seeing it I would say a sensor fault or restriction that is stopping the pump proving switch from operating
    • Rock_007
    • By Rock_007 15th Mar 17, 7:14 PM
    • 29 Posts
    • 14 Thanks
    Rock_007
    • #9
    • 15th Mar 17, 7:14 PM
    • #9
    • 15th Mar 17, 7:14 PM
    Is it any thing i can do myself to replace and where exactly the sensor is located in the boiler , just to mention that i can see that the diaphragm pin is touching the button as soon as i run the hot tap.

    Also i am not sure how much normally will it cost to do repair of this kind, much appreciated if can get an idea on the cost.
    Last edited by Rock_007; 15-03-2017 at 7:19 PM.
    • Alex1983
    • By Alex1983 15th Mar 17, 7:43 PM
    • 316 Posts
    • 166 Thanks
    Alex1983
    does the boiler have a red led inside on the right that lights up with the hot tap coming on
    • Rock_007
    • By Rock_007 15th Mar 17, 8:41 PM
    • 29 Posts
    • 14 Thanks
    Rock_007


    pics showing when the hot tap is on..
    • Rock_007
    • By Rock_007 15th Mar 17, 8:42 PM
    • 29 Posts
    • 14 Thanks
    Rock_007



    pic when the heating is working fine...
    • Rock_007
    • By Rock_007 15th Mar 17, 8:49 PM
    • 29 Posts
    • 14 Thanks
    Rock_007
    I am not sure if you are talking about the Led on the front panel or inside the boiler, as i can't see any LED inside..
    • Alex1983
    • By Alex1983 15th Mar 17, 8:53 PM
    • 316 Posts
    • 166 Thanks
    Alex1983
    Can you take one of behind that, I need to know what sort of flow switch and pump proving switch it has.

    You would need a gas safe guy to fix for you. I would suspect either the pcb has failed and it's not registering the demand. The sensor has failed and it thinks the water is hot enough so not triggering the flame or a pump proving switch hasn't operated which is not allowing the boiler to fire. I would think a pcb fault or pump proving fault would trigger a fault code so would be looking at the sensor first
    • Rock_007
    • By Rock_007 15th Mar 17, 9:16 PM
    • 29 Posts
    • 14 Thanks
    Rock_007
    All the below pics are taken while hot tap running......


    https://postimg.org/gallery/2a7sv1neg/
    • Alex1983
    • By Alex1983 15th Mar 17, 9:24 PM
    • 316 Posts
    • 166 Thanks
    Alex1983
    As the boiler is in the picture the pump proving switch is in the correct position and the hw flow switch is ok. I would be checking the sensors, 1 on the left with the red wires attached and 1 close to the bottom with the green wires.
    • Rock_007
    • By Rock_007 15th Mar 17, 11:56 PM
    • 29 Posts
    • 14 Thanks
    Rock_007
    https://postimg.org/gallery/2waz133yc/

    the above pics are from the two sensors that you mentioned i think, is there particularly i can check on the sensor as it doesn't look any thing obvious wrong for it.

    As advised if i call the gas boiler person, do you have any idea how much it will cost me for the repair as i have no idea about this as this is the first time i came across this since i moved into my house.
    • Alex1983
    • By Alex1983 16th Mar 17, 6:52 AM
    • 316 Posts
    • 166 Thanks
    Alex1983
    There isn't much you can do to be honest, a gas safe guy can test the resistance across each sensor. The correct resistance will be written in the instructions or the manufacturers will be able to tell them what they should be, the resistance will vary with the temp of the water in the boiler. What can happen is a layer of dirt/ scale can attach to them and give false readings. They can sometimes be removed and cleaned which can cure.
    The sensors will only be around £15 each.
    If it's the pcb then that could be £100-£150 for the part.
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