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Timer not switching boiler on for hot water only

  • 04-03-2020 11:09pm
    #1
    JMR
    Registered Users, Registered Users 2 Posts: 636 ✭✭✭


    3 zone timer, downstairs, upstairs and water.
    Upstairs and downstairs heating work fine but when the water timer activates, it doesn't call the boiler on.
    This is a new problem as it has always worked fine for approx 10yrs.
    A valve at the water tank does actuate but the boiler does not switch on.
    There is a thermostat fixed to the front of the tank and by adjustment, I can hear it mechanically switching around ambient temp.
    Is it most likely a dodgy thermostat? Would this fail high for safety?

    Thanks in advance for any info


Comments

  • #2
    Wearb
    Moderators, Home & Garden Moderators Posts: 6,383 Mod ✭✭✭✭Wearb


    JMR wrote: »
    3 zone timer, downstairs, upstairs and water.
    Upstairs and downstairs heating work fine but when the water timer activates, it doesn't call the boiler on.
    This is a new problem as it has always worked fine for approx 10yrs.
    A valve at the water tank does actuate but the boiler does not switch on.
    There is a thermostat fixed to the front of the tank and by adjustment, I can hear it mechanically switching around ambient temp.
    Is it most likely a dodgy thermostat? Would this fail high for safety?

    Thanks in advance for any info

    If wired conventionally it's most likely the motorized valve. Micro switch not closing.

    Please follow site and charter rules. "Resistance is futile"



  • #3
    JMR
    Registered Users, Registered Users 2 Posts: 636 ✭✭✭JMR


    Wearb wrote: »
    If wired conventionally it's most likely the motorized valve. Micro switch not closing.

    The boiler needs feedback from the valve to switch on?
    LED on the valve does activate but not sure if it's actually moving position


  • #4
    Wearb
    Moderators, Home & Garden Moderators Posts: 6,383 Mod ✭✭✭✭Wearb


    JMR wrote: »
    The boiler needs feedback from the valve to switch on?
    LED on the valve does activate but not sure if it's actually moving position

    Yes, if wired as stated above.

    Please follow site and charter rules. "Resistance is futile"



  • #5
    spaceHopper
    Registered Users, Registered Users 2 Posts: 4,101 ✭✭✭spaceHopper


    Could the cylinder thermostat have got turned down accidentally, it happened to my misses when she shared an apartment with friends


  • #6
    JMR
    Registered Users, Registered Users 2 Posts: 636 ✭✭✭JMR


    spaceHopper wrote: »
    Could the cylinder thermostat have got turned down accidentally, it happened to my misses when she shared an apartment with friends

    Thanks but no, that's not the case here.


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  • #7
    JMR
    Registered Users, Registered Users 2 Posts: 636 ✭✭✭JMR


    Tested as follows:

    1. Switched boiler on by activating timer for heating.
    2. Activated timer for Hot Water
    3. LED on the Myson Power Extra (MPE222) switches on
    4. Valve does not move position.
    5. Water does not heat
    6. Moved Myson Power Extra (MPE222) to Manual mode
    7. Valve moves position
    8. Water heats up

    Presume this indicates the actuator on the Myson Power Extra (MPE222) is faulty and needs replacing?

    Thanks


  • #8
    Wearb
    Moderators, Home & Garden Moderators Posts: 6,383 Mod ✭✭✭✭Wearb


    JMR wrote: »
    Tested as follows:

    1. Switched boiler on by activating timer for heating.
    2. Activated timer for Hot Water
    3. LED on the Myson Power Extra (MPE222) switches on
    4. Valve does not move position.
    5. Water does not heat
    6. Moved Myson Power Extra (MPE222) to Manual mode
    7. Valve moves position
    8. Water heats up

    Presume this indicates the actuator on the Myson Power Extra (MPE222) is faulty and needs replacing?

    Thanks
    Assuming electrical connections etc. are in good order, Yes.

    Please follow site and charter rules. "Resistance is futile"



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